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Interesting facts about plastics and rubber

We come across plastics and rubber everywhere in our daily lives. Discover fascinating stories, surprising facts and interesting background information – from historical developments and well-known products to key figures and innovations in the industry.

Results (423)

  • Flexible polymer foils: A new world record for solar cell efficiency

    In a remarkable feat, scientists at Empa, the Swiss Federal Laboratories for Materials Science and Technology, have developed thin film solar cells on flexible polymer foils with a new record efficiency of 20.4% for converting sunlight into electricity. The cells are based on CIGS semiconducting material (copper indium gallium (di)selenide) known for its potential to provide cost-effective solar electricity. The technology is currently awaiting scale-up for industrial applications. To make solar electricity affordable on a large scale, scientists and engineers the world over have long been trying to develop a low-cost solar cell, which is both highly efficient and easy to manufacture with high throughput. Now a team at Empa's Laboratory for Thin Film and Photovoltaics, led by Ayodhya N. Tiwari, has made (yet another) leap ahead. They achieved a record 20.4% energy conversion efficiency for thin film CIGS solar cells on flexible polymer substrates, a massive improvement over the previous record of 18.7% achieved by the same team in May 2011. Tiwari’s team has been investigating and developing various thin film solar cell technologies for some time. Over the years the laboratory has boosted the photovoltaic conversion efficiency of flexible CIGS solar cells time and again, from 12.8% in 1999 – the group’s first world record – to 14.1% in 2005, 17.6% in 2010 and 18.7% in 2011. Closing the efficiency gap to silicon wafer cellsThe latest in the series of records has been achieved, thanks to innovative ideas and excellent team work in the lab, especially by PhD students Adrian Chirila and Fabian Pianezzi. The team has succeeded in modifying the properties of the CIGS layer, grown at low temperatures, which absorbs light and contributes to the photo-current in solar cells. The cell efficiency value was independently certified by the Fraunhofer Institute for Solar Energy Systems (ISE) in Freiburg, Germany. What’s more, Empa’s new record efficiency for flexible solar cells now even exceeds the record value of 20.3% for CIGS solar cells on glass substrates – and equals the highest efficiencies for polycrystalline silicon wafer-based solar cells. "We have now – finally – managed to close the "efficiency gap" to solar cells based on polycrystalline silicon wafers or CIGS thin film cells on glass", says Tiwari. Thin film, lightweight and flexible high-performance solar modules are attractive for numerous applications such as solar farms, roofs and facades of buildings, automobiles and portable electronics and can be produced using continuous roll-to-roll manufacturing processes that offer further cost reductions compared to standard silicon technologies. In other words, they have the potential to enable low-cost solar electricity in the near future. “The series of record efficiencies for flexible CIGS solar cells developed at Empa demonstrates that thin film solar cells can match the excellent performance of polycrystalline silicon cells. Now it is time for the next step, the scale-up of the technology to cover large areas in a cost-efficient roll-to-roll manufacturing process with an industrial partner”, says Gian-Luca Bona the Director of Empa. For this purpose, Empa is collaborating with Flisom, a start-up company involved in industrialization of flexible CIGS solar cells.

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  • Only safe toys under the Christmas tree

    Topic of the Month November 2012 Only safe toys under the Christmas tree Christmas is the time of the year that both retailers and children enjoy most: while the former anticipate higher sales, the latter look forward to receiving lavish presents. The two expectations are closely linked. Not all toys prove to be worth buying, however, because they are unsafe and unsuitable for children. The rule when out shopping is therefore to be wary, no matter what natural or synthetic material the toy in question is made from. In line with the saying “better safe than sorry”, it is always important to choose carefully. This “Topic of the Month” article takes a look at what you should definitely watch out for when buying toys. Hooray – Christmas is just around the corner. The season of exciting surprises for young and old begins on 1. December. After the first door has been opened, those who count down the days until Christmas Eve with the help of an Advent calendar receive a more or less impressive little gift on a daily basis. What are hidden behind the numbers 1 to 24 are entertaining playthings or sweets – and sometimes both – particularly chocolate, which (as a recent study has shown) is not just a delicious treat; it can also represent a considerable health risk. Contamination by harmful compounds that come from the packaging (recycled paper!) are the reason for this. And then there are the presents under the tree that are opened on Christmas Eve or Christmas Day ... There is no dispute about the fact that children need toys – irrespective of their religion, race or background. For good reasons: because appropriate toys promote the development of motor and intellectual skills and thus help children to develop properly. To protect children’s well-being and physical integrity, it goes without saying, however, that toys must be safe; toys are not allowed to be dangerous or harmful to children’s health. The authorities at the European level already created a legal framework to guarantee this years ago. The new EU Directive 2009/48/EC, that aims to guarantee a high level of protection for toys, was introduced the summer of 2012. The safety requirements for toys and the minimum requirements for market monitoring apply throughout Europe. The first part of the new EU Directive, which has been in effect since 20. July 2011, covers the technical and design safety aspects, i.e. the ones that focus on the mechanical, electrical and fire safety characteristics of toys. The new rules in the chemical section of the EU Directive on the safety of toys, i.e. the part that makes such problems as pollution with heavy metals or plasticisers or harmful chemicals the centre of attention, do not come into force until 20. July 2013, however. For a long time, the EC Directive 88/378/EEC on the safety of toys outlined the fundamental requirements on all the different kinds of toys that had to be satisfied if anyone wanted to bring them into circulation in the European Union. What was true back then continues to apply, however: toys do not receive approval to enter European children’s rooms until certified laboratories have confirmed their harmlessness and have demonstrated and documented this by awarding them the CE mark, which indicates that testing has shown them to be safe; toys are not allowed to be marketed without the CE mark. Let us take a look at the details. What is important with toys To help consumers to choose suitable, safe toys, the German Ministry of Food, Agriculture and Consumer Protection (BMELV) has developed a “guide” that draws attention to action that should be taken before and after making purchases. The rules that the Ministry of Consumer Protection says should be followed before buying are unmistakable in their clarity: “Inform yourself, ask critical questions and check for yourself!” The BMELV recommends that you do your homework first: Read test reports: the German organisation “Stiftung Warentest”, for example, checks children’s toys to identify if there are any safety problems and whether they contain contaminants. Check for test marks: the GS mark indicating ‘Tested Safety’, for example. Tested electronic toys carry the VDE mark. As has already been mentioned above, toys are not allowed to be marketed without a CE mark. Take age information and safety instructions on the toys seriously. Give thought to whether the toy in question really is suitable for your child. If not: you are certain to find something more suitable. Smell the toy: if it already has an unpleasant odour – make sure you do not buy it! Smelly toys should not be allowed in any child’s room. It is a firm rule where toys are concerned that you should leave them right where they are on the shelf in the store if they have any corners and edges that could hurt a child. The same applies if toys are not tough enough, the paint is peeling off or the colour rubs off. Last but not least: take a close look at all the details. Toys should not be allowed in children’s rooms even if only the smallest of pieces might come off and be swallowed. A quick reminder in passing here, however: the age of the child concerned is a major decision-making factor when shopping. And once you have bought a toy? Good advice is not at all hard to find: common sense alone can be very helpful. The general rule is: anyone who makes a critical visual and mechanical check of his children’s toys every now and again, i.e. picks them up and examines them, can prevent serious problems at an early stage by disposing of faulty toys without further ado. But what if the toy is new, has only just been bought? If there are instructions about how to use the toy – read them. This is particularly important with instructions about how to put toys together. The washing instructions should be followed with washable parts / toys. No airplane takes off without an adequate check-up being made first: if toys are played with intensively, parts may come loose, paint may peel off or damage may occur. What is no longer in good condition should be disposed of. A critical examination at the right time can prevent harm being done. The Plastics Trade Fair staff hope this article will help you to choose the right Christmas presents and enjoy a relaxing Christmas holiday. Source: Text of the new EU Directive on the safety of toys www.kindersicherheit.de/pdf/2009spielzeugrichtlinie.pdf Guido Deußing

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  • Artificial cornea gives the gift of vision

    ArtCornea is easy to implant. This artificial cornea does not trigger any immune reactions. (Source: IPA) Our eyes are our window to the world. Thousands of people have lost their eyesight due to damages to the cornea, such as trauma, absent limbal stem cells or diseases. Transplantation of a donor cornea is the therapy of choice for a great number of those patients. Let alone the issue of scarce donor material, a sub-group of patients do not tolerate transplanted corneas, necessitating the employment of an alternative means of restoring eye sight. In Germany alone, around 7,000 patients are waiting to be treated. In close cooperation with the Aachen Centre of Technology Transfer, Dr. Storsberg and his team from the Fraunhofer Institute for Applied Polymer research IAP in Potsdam, are attempting to improve the situation by developing an artificial cornea. Scientific partners in the “ART CORNEA” project include the Martin Luther University of Halle-Wittenberg, ACTO e. V. and the Ophthalmic Clinic Cologne-Merheim. “We are in the process of developing two different types of artificial corneas. One of them can be used as an alternative to a donor cornea in cases where the patient would not tolerate a donor cornea, let alone the issue of donor material shortage,” says IAP project manager Dr. Joachim Storsberg. The scientist has considerable expertise in developing and testing of next-generation biomaterials. Between 2005 and 2009 he collaborated with interdisciplinary teams and private companies to successfully develop an artificial cornea specifically for patients whose cornea had become clouded – a condition that is extremely difficult to treat. Such patients are unable to accept a donor cornea either due to their illness or because they have already been through several unsuccessful transplantation attempts. Dr. Storsberg was awarded the Josef-von-Fraunhofer Prize 2010 for this achievement. “A great many patients suffering from a range of conditions will be able to benefit from our new implant, which we’ve named ArtCornea", predicts Storsberg. ArtCornea is based on a polymer with high water-absorbent properties. Dr. Storsberg and his team have added a new surface coating to ensure anchorage in host tissue and functionality of the optic. The haptic edge was chemically altered to encourage local cell growth. These cells graft to the surrounding human tissue, which is essential for anchorage of the device in the host tissue. The researchers aimed to enlarge the optical surface area of the implant in order to improve light penetration beyond what had previously been possible – a tall order. “Once ArtCornea is in place, it is hardly visible, except perhaps for a few stitches. It’s also easy to implant and doesn’t provoke any immune response,” says Storsberg, highlighting the merits of this new development. Functioning The specialists have also managed to make a chemically and biologically inert base material biologically compatible for the second artificial cornea, ACTO-TexKpro. Dr. Storsberg achieved this by selectively altering the base material, polyvinylidene difluoride, by coating the fluoride synthetic tissue with a reactive molecule. This allows the patient’s cornea to bond together naturally with the edge of the implant, while the implant’s inner optics, made of silicon, remain free of cells and clear. The ACTO-TexKpro is particularly suitable as a preliminary treatment, for instance if the cornea has been destroyed as a consequence of chronic inflammation, a serious accident, corrosion or burns. The experiments were carried out in collaboration with Dr. Norbert Nass and Dr. Saadettin Sel, Senior consultant ophthalmologist at Martin-Luther-University Halle-Wittenberg. How well TexKpro and ArtCornea are accepted by clinicians as an additional tool at their disposal was first tested by the doctors in the laboratory thereafter in vivo in several rabbits. After a six month healing process, the implanted prostheses were accepted by the rabbits without irritation, clearly and securely anchored within the eye. Tests carried out following the operation showed that the animals tolerated the artificial cornea well. Prof. Dr. Norbert Schrage will take charge of clinical trials that will soon commence at the Eye Clinic Cologne-Merheim. It is likely that the positive results of tests carried out thus far will be confirmed, and the co-operation partners rate the chances of success very highly. Their optimism is well founded: As early as 2009, several Ultima-Ratio patients received implants of a Kerato prosthesis specially developed for them because they had previously rejected human corneas. These patients have not suffered any complications and are still wearing their artificial corneas today. Quelle Fraunhofer-Institut für Angewandte Polymerforschung

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  • Dry feet and “très chic” thanks to wellies

    Topic of the Month September 2012 Dry feet and “très chic” thanks to wellies September has already begun. Summer is on the retreat and autumn is back. The days are becoming noticeably shorter and the temperature is dropping – particularly at night – while rain showers are unpleasantly cold and wet rather than refreshing, like they were only a short time ago. Especially on the skin and inside one’s shoes, when the water gets through the seams. Waterproof footwear made out of plastic with a shaft, i.e. a tubular extension that extends beyond the ankle up to the knee, provides the best protection against wet feet: Wellington boots, known to one and all as wellies, are not just the footwear of choice for farmers out in the fields and in the cowshed or the hunter’s loyal companion out in the woods. On the contrary: rubber boots are becoming an increasingly chic and modern accessory for one and all. They are extremely fashionable nowadays and will very soon be an established sight in city streets too. Since time immemorial all over the world, fathers and mothers have taught their children to be careful in the choice of their outfits – shirts and trousers, belts and socks, jackets and shoes – because they know: clothes make the man (and the woman), so it is important that young people learn how to dress properly and, as a result, find favour and friends in society. The French Republic is considered to be one of the leading fashion countries, where clothes are created that – see above – “make the man (and the woman)”. More than just about anyone else, the tailors and designers based in Paris have influenced international fashion trends – producing clothes and such concepts as “haute couture” and “prêt-à-porter”. Although these two fashion concepts differ greatly – one of them meant for the catwalk and very special occasions, while the other is supposed to be affordable streetwear – the two of them do have one thing in common: in some way or other, both of them always want to be “très chic”. It is a well-known fact that there is no accounting for taste, but the functionality of an article of clothing can be the subject of endless debate. As far as functionality is concerned, a foreigner beat the French to it in the middle of the 19th century, even though the latter are not just aesthetes; they are very practical too. About country life and a visionary company founder [1] At the time, most French people worked on farms. They spent large amounts of time outdoors in all weather conditions not just because they loved Mother Nature, who fed them – and whose caprices they were exposed to practically unprotected. Whereas they were sometimes scorched by the sun, it rained for days or weeks at other times – not to mention the additional problems caused by ice and snow. When it rained hard enough, fertile soil in no time at all became a swamp, which was thoroughly unpleasant to wade through, especially at wet and cold times of the year. It was not unusual for the wooden clogs that were in widespread use as footwear at the time to get stuck in the mire or even to disappear in the boggy mud, never to be seen again. In a nutshell: although wooden clogs proved to be a viable solution for country people, they were not ideal. This is where the US engineer Hiram Hiram Hutchinson (1808-1869) came in. Around 1839, his fellow American Charles Goodyear (1800-1860) had developed the vulcanisation process (at the same time as the Englishman Thomas Hancock, 1786-1865), with which elastic rubber could be produced from plastic rubber. (Incidentally: it goes without saying that the history of rubber goes back very much further into the past. It leads to exotic countries and a bloody and not very glorious chapter in the history of mankind. But more about this here at a later date.) We now know that the discovery Goodyear and Hancock made proved to be a milestone in plastics research. For vulcanisation purposes, a rubber compound consisting of crude rubber, sulphur or substances like disulphur dichloride (S2Cl2) that contain sulphur, catalysts to increase the reaction speed and fillers, is heated up. In the course of this process, sulphur bridges form, via which the long-chain rubber molecules crosslink. The rubber loses its plasticity during this reaction. By comparison with the original product, the material created as a result has, in turn, permanently elastic properties and always returns to its original position under mechanical stress, while it is also more tear-resistant, stretchable and, last but not least, more resistant to ageing and weathering. Hiram Hutchinson must have found it electrifying when he got to know this impressively elastic, waterproof material called rubber. Its novelty and many different properties that no material before had offered stimulated the imagination of the visionary engineer, who was an entrepreneur too. All the different things it would be possible to make out of rubber! Hard-wearing shoes, for example. And this is exactly what Hutchinson made once he had acquired a licence to produce rubber boots from Goodyear. In doing this, he was creating a rival for the traditional wooden clogs. Anticipating growing demand for his rubber boots, Hutchinson moved to France in the middle of the 19th century and established a factory for the industrial processing of rubber in Montargis, about 100 kilometres away from Paris in 1853 ( Aigle ), following this seven years later with one in Mannheim, Germany, too. The company that Hiram Hutchinson established expanded very fast in the context of the industrial upswing that occurred during this period ( Company milestones ). The family set up further companies in France as well as locations in Spain and Italy. In 1903, it became a joint-stock company and the registered office was moved to the Champs-Élysées in Paris. Hutchinson S.A. has been part of the Chemical Division of the French TOTAL Group since 1974. Hutchinson now considers itself to be one of the world’s leading manufacturers and processors of high-quality elastomer products and is market leader in many different areas. The Hutchinson-Group has about 120 production and sales locations all over the world and more than 25,000 employees. The company generates its sales (about € 2.3 billion in 2009) in the automotive, industrial and consumer goods markets. The success story of Wellington boots in Great Britain [2,3] Hiram Hutchinson was not the only American who concluded a contract with Goodyear. Henry Lee Norris (1813-1881), a businessman from New Jersey who made his way to Scotland in 1856 to try his luck in the British Empire with rubber and rubber boots, did the same thing. In contrast to Hutchinson, Norris did not choose workmen and farmers as his target group. He found his main market among the better-off, among aristocratic gentlemen and officers. Norris benefitted from an infrastructure that was already in existence as well as from fortunate circumstances. Great Britain made a name for itself throughout the world as a military power at the beginning of the 19th century. The royal troops went on the march not just in Europe but also in faraway India, defending important outposts of the British Empire. Imperial hegemony, prestige and resources were the driving forces here. There was a major revolution in men’s fashion back home in Great Britain at the same time: knee breeches were replaced by longer, close-fitting trousers. This change in fashion affected footwear too, which was dominated at the time by what were known as Hessian boots, which were loose-fitting, reached up to the knees and boasted various ornamental features, so that they matched the knee breeches perfectly. When they were introduced, the new trousers did not, it was thought at the time, harmonise at all with the Hessian boots. Im 1817, Sir Arthur Wellesley (1769-1852), the first Duke of Wellington and a highly decorated and successful military leader who – among other things – fought against Napoleon, asked his shoemaker to solve the problem: the solution had to be a different boot! A boot that was supposed to be comfortable and, at the same time, cut so snugly that it could be worn underneath trousers without any difficulty. The London shoemaker came up with an impressive solution: the new boot was made from supple calfskin and fitted closely around men’s legs; it was not only hard-wearing and highly suitable for military combat but was also comfortable and smart enough for high-society men to use as evening wear and for formal occasions. In recognition of this convincing design, the new boots were called Wellington boots from now on, in honour of the man who commissioned them. Back to where we started our little excursion: in 1856, Henry Lee Norris bought buildings in Edinburgh and formed the North British Rubber Company as a limited company. In view of the lack of skilled workers and machines in Edinburgh, he had everything that was necessary brought to Scotland from overseas. An expensive procedure, but one that proved – in the final analysis – to be successful. The company produced not only rubber boots based on the Wellington models but also a wide range of other rubber articles for the English market, such as tyres, conveyor belts, combs, golf balls, hot-water bottles and rubber flooring. The company experienced an economic boom unlike anything it had ever experienced before when the First World War started. The countries involved faced each other in a long, drawn-out period of very gruelling trench warfare in France. The soldiers on both sides suffered from the consequences of muddy trenches that were flooded by rain and groundwater. Their shoes, which were damp or wet all the time, made them ill. The troops became demoralised. The North British Rubber Company was therefore commissioned by the government to produce rubber boots that were suitable for use in such battle conditions. The machines ran day and night and produced a total of 1,185,036 pairs of boots. When the Second World War broke out, the company experienced another economic upswing; 80 per cent of production in 1939 consisted of war materials, including life belts, bomb covers, gas masks and Wellington boots – as well as “overknee boots” that helped the British Army to keep their feet dry when crossing the flooded areas of the Netherlands. (Nowadays, boots that reach far above the knees are used primarily in amateur and professional fishing.) In the years after the Second World War, the company’s boots became very well-known and increasingly popular, particularly in the working and hunting communities. In 1958, the North British Rubber Company scored another coup that boosted its image even more when it introduced the high-priced Hunter and Royal Hunter boots. Many different structural and name changes were made to the company after this as well and it is now known as Hunter Rubber Co. Ltd. - and is an official supplier to the English royal family. (More background ) From useful footwear to a fashion accessory Hunters, who wear rubber boots almost the whole year round, make exacting demands on their footwear. They very rarely – perhaps on hot summer days, if at all – choose to wear anything else. The requirements that hunting boots have to satisfy are not therefore limited solely to the green colour of the material, in order to provide perfect camouflage out in the fields and forests. More than anything else, the boots need to be tough and at the same time comfortable. The boots in general and the soles in particular are not designed for long hikes, while they are not able to remove sweat or counter ground frost in the winter either – rubber is simply not suitable for this in wall thicknesses that are standard for shoes. The inner lining is primarily responsible for creating a pleasant climate inside the boot; this also has a substantial impact on the price of the boots and is an essential feature when spending time out in the country in summer too, as experts advise. [4] The quality and workmanship of the outer material, i.e. the plastic used, play an important role, however: rubber boots are not all the same. High-quality rubber boots that are really very good generally keep the promises their name makes: they are manufactured from processed or even natural rubber and are exclusively handmade. Like in the production of leather boots, pieces cut out of natural rubber are worked around a last. The basic boot is then reinforced in a latex immersion process and is subsequently vulcanised in an oven. [4] Other materials are now being used in boot production to an increasing extent too, particularly high-quality, efficient polyurethane and polyvinyl chloride (PVC). It is not immediately obvious to non-professionals what the differences are between the various alternatives, particularly in view of the fact that there is a practically endless range of products on the market, as a look at the website of a well-known Internet shoe supplier shoe supplier shows: there are rubber boots for women, men and children; for hobby, professional or leisure use; for riding, fishing and wading, for summer, autumn and winter – in all conceivable designs: in rainbow colours, with flower, check or striped patterns; with smooth soles and with tread; with glossy or imitation leather finishes; with buckles and other accessories at ankle or calf height; to slip on and to tie up. One thing, above all, is very evident: the range of different applications for rubber boots has changed and increased fundamentally. Whereas they were originally used mainly for functional purposes, primarily to keep the feet and calves of French or German farmers dry, rubber boots are now considered to be fashionable and chic and are accepted in society as appropriate footwear outside the work or recreational sport environments too. The forthcoming autumn and winter season will confirm what GDS , the “international event for shoes & accessories“ that was held recently from 5. to 7. September 2012 in the halls at Messe Düsseldorf, demonstrated very impressively: rubber boots are extremely trendy! Incidentally: one of our future Topic of the Month articles will be focussing on the strange excesses of rubber footwear fashion. GDeußing Sources and cross-references [1] „Über 150 Jahre im Zeichen des Fortschritts“. Hutchinson worldwide [2] Hunter-History [3] http://homepages.rootsweb.ancestry.com/~olson/russtory.htm [4] Deutsche Jagdzeitung: Gummis für die Füße

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  • High-temperature superconductivity with Scotch tape

    University of Toronto physics professor Ken Burch with experimental apparatus and tape. An international team led by University of Toronto physicists has developed a simple new technique using Scotch poster tape that has enabled them to induce high-temperature superconductivity in a semiconductor for the first time. The method paves the way for novel new devices that could be used in quantum computing and to improve energy efficiency. "Who would have thought simply sticking things together can generate entirely new effects?" said team leader and U of T physicist Ken Burch. High-temperature superconductors are materials that conduct electricity without heating up and losing energy at liquid nitrogen temperatures. They are currently in use for transmitting electricity with low loss and as the building blocks of the next generation of devices (quantum computers). However, only certain compounds of iron, copper and oxygen – or cuprates – reveal high-temperature superconducting properties. Cuprates were believed to be impossible to incorporate with semi-conductors, and so their real-world use has been severely limited as has the exploration of new effects they may generate. For example, observing the phenomenon of the proximity effect – wherein the superconductivity in one material generates superconductivity in an otherwise normal semi-conductor – has been difficult because the fundamental quantum mechanics require the materials to be in nearly perfect contact. That's where the poster tape comes in. "Typically, junctions between semi-conductors and superconductors were made by complex material growth procedures and fabricating devices with features smaller than a human hair," explains Burch. "However the cuprates have a completely different structure and complex chemical make-up that simply can't be incorporated with a normal semiconductor." So instead, the team used Scotch poster tape and glass slides to place high-temperature superconductors in proximity with a special type of semi-conductor known as a topological insulator. Topological insulators have captured world-wide attention from scientists because they behave like semi-conductors in the bulk, but are very metallic at the surface. The result was induced superconductivity in these novel semi-conductors: a physics first. Source Department of Physics at the University of Toronto

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  • Ghostbusters in the desert

    According to the Himba people, the large circular patches with reduced vegetation on the floor of the Namib Desert are a supernatural phenomenon of mystical origin. The “fairy circles” appear similar to crop circles, a phenomenon known for centuries and by some attributed by some to be signs of extraterrestrial visitors. South African scientists have worked to unearth the secret of the mysterious circles. In their view, the circles are created not by extra-terrestrial forces, but rather by subterranean phenomena. It gets hot, really hot, in the Namib Desert; and really cold as well. In some places temperatures hover above the 50 °C mark during the day and descend below the freezing point at night, it is an incredibly dry, arid, but in places grass-covered desert. When the sun rises it not only heats up the desert, it also exposes a spectacular sight: Thousands of mysterious circles cover the vast expanse of the Namib, side by side, like pockmarks on the desert’s sand-colored face. The so-called “fairy circles” are surrounded by tales and myths. Their uniform appearance, sheer number, and distribution have always sparked human imagination. Natural displays of such regularity are typically awarded a deeper meaning or attributed to higher powers and tales are spun. The tales of the Himba, a semi-nomad people in Northern Namibia, relate that a dragon lives underneath the desert sand and breathes fire. The fire rises to the surface in hot bubbles singeing the ground in circular shapes – the birth of a fairy circle. Of course the description is naïve like most folklore; however, at a second glance it appears closer to the truth than the explanations offered by scientists in the 1970s and 1980s, which many still cling to. According to those theories, the fairy circles are remnants of termite activity: In their search for food, termites supposedly devoured the thin grass cover in a circular area, presumably never venturing more than a certain distance from their mound. Other experts suspect that ants, clearing the ground of grass seeds, have caused the circular patches with no or dying vegetation. (Basic and Applied Dryland Research 1, 2 (2007), 121-137). „This is not the case“; scientists of the University of Pretoria in South Africa now discard previous theories as well as oral tradition. Instead of relying on speculation, chemists Yvette Naudé and Egmont Rohwer from the Department of Chemistry and their colleague Gretel van Rooven from the Department of Botany had gone into the Namib Desert to investigate the matter based on scientific facts using chemical analysis instrumentation and on-site observation of insect activity. Their investigative research allowed the scientists to draw a scientifically based conclusion proving natural geochemically based causes (Journal of Arid Environments 75, 5 (2011) 446-456). The ground is breathing Naudé and her colleagues first went on location in the desert for a visual examination, similar to what police detectives do at a crime scene. For the record: fairy circles are circular areas on the ground, which are free of vegetation or covered by still live (yellowing) or dead (gray) vegetation. They are typically surrounded by comparatively lush vegetation. “None of the dead grass in the circle showed marks caused by termite mandibles”, Yvette Naudé explains. According to the scientist, the fact that the inner circle contained dead as well as live vegetation indicated that this was a fairy circle in the making. Thus the theory of hungry termites and grass seed-collecting ants could be investigated on site during the formation of a circle and could not be confirmed. Another observation was made and yet another theory formed and tested: the partly lush vegetation at the edge of the fairy circles could indicate the involvement of allelopathic compounds. Some plants release these in order to harm other forms of vegetation that are trying to encroach on their territory. Are plants on the vegetation-rich edge of the fairy circle able to do so? At first glance, the idea seemed both possible and plausible, according to Yvette Naudé. However, potting trials proved that allelopathy did not play a role. Additionally, fairy circles also develop in vegetation-free, sandy areas: “The sandy ground in these fairy circles looks shaken and churned up”, the researchers describe, “similar to craters found on the ocean floor, which are caused by gas bubbles percolating out of the ground.” Based on this observation, Yvette Naudé and colleagues developed the hypothesis that gases and fluids of geological origin play a role in the formation of the fairy circles. The scientists’ theory: “Gases and fluids seep in specific migration pathways. Once the gases reach the soil surface they start to disperse forming a circle.” There are plenty of potential gas sources in Namibia, suggests Yvette Naudé. These include both big oil and natural gas reservoirs and the country’s geothermal activity visible at the hot springs in Namibia’s spa towns. The scientists started their investigations by determining the soil gas composition in selected fairy circles as well as in “the matrix”, areas between the circles where there are no geobotanical anomalies. Gas samples were collected by inserting suitable collection funnels into the ground. Several times throughout the day the levels of carbon monoxide, carbon dioxide, oxygen, hydrogen sulfide and nitrogen dioxide were determined using a portable gas analyzer. The gas analysis allowed a number of conclusions to be drawn concerning the soil chemistry, reports Yvette Naudé. Carbon monoxide, for example, allowed conclusions about the presence of natural gas. Natural gas is not considered toxic for plants, but it turns out to be an important stress factor for the vegetation. The presence of hydrocarbons was shown to lead to an increase in the activity of oxidizing and reducing (e.g. sulfur-reducing) bacteria, which again lowers the level of oxygen in the soil. This may have far-reaching, almost cascading effects for the soil chemistry, the scientists explain: “Apart from the oxygen decreasing periodically in the soil of the fairy circles, as we have found during our measurements, an upwelling of gases can lead to increased formation of organic acids, which influence the pH value of the soil and therefore the availability of important minerals for plant development. ” Plants grown in soil collected from fairy circles”, the scientists report further, “did not flourish, in contrast to plants that were planted in soil from the vegetation-rich edges of the fairy circles and in the matrix”. From theory to practice To develop a clearer picture as to the presence and distribution of hydrocarbon compounds in the soil of the fairy circles, the scientists turned to thermal desorption in combination with gas chromatography and mass-selective detection. The advantages of the thermal desorption technique: “It is cost effective, simple and it doesn’t rely on toxic organic solvents,” explains Yvette Naudé. Solvent-free extraction brings several benefits: Cost savings; a cleaner base-line and lower detection limits; a clean chromatogram without solvent peak masking of analytes; higher sensitivity since there is no analyte dilution; and last, but not least, cleaner laboratory air. Thermal desorption GC/MS also requires much less sample than, for example, Soxhlet extraction, which is commonly used for isolating and analyzing hydrocarbons in soil. The scientists took soil samples in carefully selected locations as follows: A 40 gram sample of soil was placed in a prepared glass vial, a special polymer-coated (polydimethylsiloxane, PDMS) stirrer, a so-called PDMS-Twister, was added and the vial was sealed. The Twister has been used successfully in many applications to extract organic compounds from solid, liquid, and gaseous samples. PDMS is used as sorption phase to concentrate extracted analytes from the sample. Back to the soil samples: The sealed vial was heated to 50°C for 50 minutes. When the scientists then removed the twister from the sample, magnetic particles were clearly visible at its end, another clue confirming the theory of a micro-seepage of hydrocarbon compounds in the ground, which, according to Yvette Naudé, is known to induce microbial changes of magnetic and iron-containing minerals. The analysis results support the theory of the scientists: “We detected alkenes and microbiological metabolites of alkanes. Higher alkene concentrations were found in soil from the center of the fairy circle and lower concentrations in the matrix, the area without geobotanic anomaly.” This suggests that there is strong microbial activity in the soil inside the fairy circles. Additionally, the alkane-alkene concentration ratio found allowed the scientists to draw conclusions as to the activity of a particular fairy circle: higher ratios suggested a newly active circle. “Our observations and our results do not support the involvement of termites or ants”, concludes Yvette Naudé. However, one thing remained to be explained – why are fairy circles round? Yvette Naudé: “The overlying sand causes dispersion of rising gases from a seep, creating a funnel-like formation which is seen at the surface as a circle. The circles are not all the same size, and can vary dramatically depending on seep rates, sand conditions, and the underlying geology.” Acknowledgment Special thanks go to Dr. Yvette Naudé and colleagues as well as to Mr. Marc Springer, Namibia Allgemeine Zeitung, for supplying the photographs used in the article. Copyright: Guido Deußing http://www.k-online.de

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  • Focus on plastic buckets

    Quelle: Plastic bucket - not allowed on the Playa de Palma. GDeußing Majorca has plenty to offer that makes life worth living: beautiful beaches along the turquoise water of the Mediterranean; delightful, unspoiled countryside, bathed in the warm light of the Mediterranean sun; mountains that are ideal for hiking and simply enjoying nature; art, culture and charming people as well as – last but not least – sheer relaxation all year round. Strangely enough, however, these features of the biggest Balearic island are rarely what come to mind first when thinking about holidays on Majorca. Tourists drinking hard liquor out of plastic buckets through metre-long straws on the Playa de Palma are what occur to us more quickly instead. This is supposed to be a thing of the past soon now, however. Posters around the famous Ballermann pub are drawing attention to the fact that plastic buckets designed for heavy drinking sessions using straws are not allowed on the beach. There is a danger of large fines if this rule is ignored. It will be intriguing to see whether fans of this peculiar drinking ritual will comply with the ban. From advertising: “You can reach the Balearic Islands from any country in Europe in just a few hours. You get in a plane and leave everyday life behind you as if you are taking off your shoes on entering the house. And, when the time comes again, you can return to your day-to-day life just as quickly as you reach your home on the island. Only to do the same thing again the next weekend when you come back to the captivating island of Majorca.” There are a lot of places of interest. But many Majorca visitors rarely bother to get to know the island and its people. They are interested in something else. Their destination is only a few minutes’ drive away from the airport in Palma, the capital, on the Playa de Palma, around the (in)famous Ballermann pub – the hotspot for partying on the island that is popular with many young people from all over Europe. July 2012, holiday season, high season. The green flag is flapping in the wind above awnings and air mattresses in a clear sky, indicating to beach visitors that it is perfectly safe to go in the water. The port of the island capital of Palma del Mallorca can be seen in the distance off to the right and the waves are crashing powerfully and loudly on the beach while another airplane with hundreds of tourists on board is starting its descent to the island; the German radio station on the island reports that about 145,000 passengers go through Palma Airport every day. Off to the left, not far from the part of the city known as S’Arenal, a large dark cloud of smoke can be seen; arson is suspected. The police have their work cut out for them to keep the traffic moving past the section of the city where the fire is burning. A fire-fighting aircraft is flying over the beach to collect water off the coast. The aims are to limit the damage done to the burning vegetation - that is obviously suffering from a lack of water – from the air and to stop the flames from moving into the city itself. Many of the visitors to the beach with their hands on their hips or shielding their eyes from the sun find the spectacular flights of the airborne fire brigade a welcome diversion, with plenty of spray to admire on the slightly choppy sea. Take a bucket and alcohol A group of 18- to 20-year-olds, who are gathered around a plastic bucket on the sandy beach like druids around a pan of magic potion, are thoroughly unimpressed by this sight. A bunch of colourful, metre-long drinking straws project out of the bucket, like flowers in a vase. There is no reason to believe that cleaning water is what the bucket contains. (Although the plastic container is a reminder of the early days of mass tourism, when Majorca was still being decried as an island for cleaning ladies on holiday. But that is another story entirely.) From a distance, it is only possible in most cases to speculate what the bucket contains. Anyone who looks around while strolling along the promenade can work it out pretty easily, however: A shop on the other side of the road sells buckets and straws, including appropriate recipes for what to put in the bucket – all of them involving mixtures of sangria or even more alcoholic beverages, juice and/or fruit, that do not have any thirst-quenching properties. What the in almost every case young people down there on the beach in their swimming shorts and bikinis are drinking through red, yellow, blue and green plastic straws is meant in their eyes to be a cocktail that gets them in the right mood for the party that is held in the popular tourist area around the Ballermann pub from early in the morning till late at night. Policemen patrol along the promenade on motor scooters or in cars, while they go on horseback or foot elsewhere. They keep a close eye on dubious, well-organised watch salesmen by the side of the road, most of whom have already run off by the time the policemen arrive, warned by special acoustic signals given by informers positioned at strategic locations. It is perfectly obvious that the groups of tourists sucking on plastic straws around the plastic buckets have no intention of trying to run away or hide. They can see the police and the police can see them. The policemen take a quick look at what is going on and then almost immediately go back to checking what else is happening in the crowds on the promenade. It is 3 o’clock in the afternoon and the day is still young. Routine on the Playa de Palma. Just a minute. There are rules about what is and is not allowed! Let us play the film back a bit. What did it say on the numerous posters stuck in highly visible places at eye height on posts along the promenade? A yellow plastic bucket, filled with a red liquid and with straws in it, on which the statement in Spanish “No en la playa” in bold type can be read. Underneath this, in somewhat smaller letters “Nicht am Strand”, “Not on the beach” and “Pas sur la plage”. One would think that this is an easily understood message. But neither the visitors to the beach nor the police pay any attention to it. Even though there would be a definite reason for the police to take action and stop excessive drinking out of plastic buckets: a municipal regulation came into force in Palma in March 2011 that bans boozing in public. Fines can be imposed if this regulation is not observed. The obvious lack of interest on the part of the police – which, by the way, is misinterpreted as tacit approval by many of those who make a habit of drinking out of buckets – can be attributed to the story behind the story. The regulation is in actual fact directed primarily against the “Botellones” that are popular among Spanish young people, who meet in parks or at other public places for collective drinking sessions; this means that the regulation applies on the Playa del Palma as well. The police does not intervene, however, as long as the group of drinkers are not a public nuisance and no indecency is involved. In the final analysis, it is questionable whether a poster is any help in avoiding boozing as outlined above. And whether bans are a suitable way to reach this objective anyway. Two young men found a creative way to observe the rule without sacrificing any of their pleasure: instead of sitting on the beach with their bucket, the two of them chose to sit on the wall next to the beach; they simply put the plastic bucket on the pavement by the wall and had no trouble in reaching it without any complicated gymnastic exercises with the help of the flexible, metre-long plastic straws. Copyright: GDeußing

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  • Material of the 21st century: Plastics move the world

    The plastics industry is worldwide one of the most innovative sectors. The secret of its success lies in the plastics themselves, which leave almost nothing to be desired – even in view of our society’s globally important tasks. The Topic of the Month in July 2012 takes a closer look at the literally moving aspects of plastics and the special exhibition during next year’s K. Population growth, increased energy demands, scarcity of resources, climate change – mankind faces challenges of previously unknown dimensions. “This re-quires creative minds and equally creative materials to realize necessary innova-tions”, says Dr. Rüdiger Baunemann. The managing director of PlasticsEurope, the association of plastics manufacturers in Germany, emphasizes that synthetic materials or plastics (polymers) contribute greatly to fulfilling existing and future demands. How mobilizing – both literally and metaphorically – polymer materials can be will be shown in the special exhibition “Plastics Move” during the K 2013. Can we imagine a world without plastics? The question seems justified, considering the rapidly evolving plastics industry. Last year, approximately 280 million tons of plastics were produced; in 1950 it was only 1.5 million. Part of this development is the fascinating possibility to turn ideas into real, tangible innovations with the help of plastics. The applications and possibilities are numerous and varied; simply too extensive to be covered fully and in detail in a few lines. Therefore the diversity of plastics and their applications will be demonstrated according to the ‘pars-pro-toto’ principle, by taking a look at a few, but most important areas. Plastics, the packaging star One of the biggest areas for the application of synthetic materials is packaging. In Germany, approximately every third ton (34 percent) of plastics is used for the production of packaging materials (Source: PlasticsEurope Germany e. V.). As flexible, tear-proof and intelligent wrapping materials, plastics ensure the safe and efficient transport of food products. Good examples are films made from polyethylene (PE), a material with a good moisture barrier, or from polyamide (PA), which provides a good oxygen barrier. Composite PE/PA-materials can be used to create films of varying thickness for the packaging of foods, which are resistant to water vapor and nearly impervious to air. For example, spices wrapped in a PE/PA film retain their aroma and do not form clumps. Another excellent example for the use of plastics as packaging materials is the polyethylene (PET) bottle. In 2010, approximately 10 billion liters of mineral and healing waters were bottled in German mineral water facilities; the average per-capita consumption was at around 131 liters mineral water per year. The biggest advantage of the PET bottle in comparison to the conventional glass bottle is its significantly lower weight – a fact which is not only appreciated by the consumer in the supermarket, who has to transport the purchased crate of water bottles from the checkout to the trunk of his car and to the storage room in his house. A PET bottle weighs around 37 grams, a glass bottle around 600 grams; in other words: 16 PET bottles weigh approximately as much as one glass bottle of the same volume. The low weight of the PET bottle presents a significant economical as well as ecological advantage: because PET bottles are so light, the cargo hold of a truck can be fully used without overloading the vehicle, and fewer vehicles on the road means less environmental pollution from car exhaust. With a per capita consumption of 131 liters of mineral water, a consumer would have to transport around 80 kilograms of empty glass bottles per year, while the same number of PET bottles only weighs 4.85 kilograms. Clear advantage for plastics. Synthetics as ideal insulation material An uninsulated single-family house, built in the 1960s, loses up to two thirds of its heating energy through external walls, cellar and roof. Every year, approxi-mately 2000 liters of heating oil are wasted this way. In order to prevent the heat loss and reduce the energy demand, houses need a solid coat of modern insulating materials. The most important fully synthetic material in heat insulation is foamed polystyrene. Most widely used is expanded polystyrene rigid foam (EPS), which can be formed into blocks, boards, and other geometrical shapes. Extruded polystyrene rigid foam (XPS) can be produced as a continuous string of foam in varying dimensions (also see Topic of the Month February 2011: “Comfort is key – synthetics as cold weather protection”). All in all, polymer foams sustainably contribute to the insulation of buildings, to the advantage not only of the consumer, but also of the environment. In comparison: The consumption of heating oil in a conventionally built house is approximately 19 liters per square meter (2470 liters/year), the consumption of a house with synthetic insulation only 5.5 liters (585 liters /year). A reduction of 1900 liters of heating oil translates into savings of 1600 Euros and a reduction of greenhouse gases like carbon dioxide of more than 75 percent; instead of 7700 kilograms of carbon dioxide, only 1800 kilograms are emitted (Source: PlasticsEurope). Transporting drinking water and waste water through plastics safely and without losses Around eight percent of the German drinking water seeps into the ground un-used, which approximately equals a billion liters per day. Across Europe, the rate of loss is even higher with approximately 25 percent. A similar situation can be found for waste water: approximately a third of the waste water system shows faults and defects. Drinking water pipes usually consist of different materials, such as plastics, metals and composite materials. Aside from steel, underground pipes also use polyethylene pipes (PE-pipes) or pipes made from polyvinyl chloride (PVC). For installations in the house, pipes are predominantly made of copper, stainless steel, galvanized steel (threaded tube), aluminum-multilayer composite and other plastics (PE, PVC-U). Plastic pipes are increasingly used because of their quick and simple installation. The repair of (often aging-related) damages on underground pipes and sewers nowadays mostly utilizes repair methods that do not require digging and therefore avoid damage to streets and sidewalks. Different methods are available, such as the insertion of partial liners or flexible pipe or tube strands. The common factor is the insertion of a synthetic tube impregnated with synthetic resin (epoxy resin or polyurethane resin) or a flexible tube made of polyethylene or polypropylene into the damaged pipe and the leaks are sealed. Puryfing water safely with synthetic materials Besides the transport of water, synthetics also play a large role in the treatment and purification of drinking water. A major problem is the availability of clean drinking water. Currently clean water is in short supply for approximately 1.1 bil-lion people. According to the United Nations (UN), 6000 people die every day, around two million people each year, because the hygiene is not appropriate and there is no access to clean, safe drinking water. Part of the problem is ‘home made’, the logical consequence of human existence: waste water. 2.4 billion people do not know what to do with their waste water. It is introduced into the environment without any treatment and purification and finds its way maybe into a lower-level drinking water reservoir in the area. According to calculations, one liter of waste water can pollute eight liters of fresh water. Not surprisingly the main sufferers in this issue are people in the developing nations. But how can this problem be managed? Perhaps by decentralized solutions directly at the location of water withdrawal. The Swiss company Vestergaard Frandsen has developed a mobile, easily transportable water treatment unit, which apparently points in the right direction. For their new, portable water purificantion system Lifestraw® Family the company Vestergaard Fransen utilizes Ultrason E 6020 P, a polyether sulfon (PESU) created by BASF. The easy-to-operate plastic construction LifeStraw® Family is used to purify large amounts of waste water on location in the villages and families into drinking water. Central element is a plastic casing, approximately 30 centimeters in length, which contains filtering membranes made from Ultrason E. These achieve ultrafiltration (UF-membranes) and remove viruses as well as bacteria from dirty surface waters from rivers, lakes, rainwater collection barrels or even puddles. The special advantage of the high-performance synthetic material Ultrason E in these filters is that it can be processed extremely well into membranes with precisely adjustable pore sizes and therefore clearly defined filter characteristics. The mobile purification station drastically reduces the danger of diseases that are transmitted via dirty water, such as gastro-intestinal diseases. According to the World Health Organization (WHO), every year 1.8 million people die of the consequences of diarrhea. Efficiently mobile in the future with plastics The characteristics of plastics – being extremely flexible, highly resilient and yet very light – have boosted the career of plastics in many areas of application. Re-ducing weight in vehicles of all kinds also means savings in terms of cost, use of resources and emissions. It is not about rivaling conventional materials like met-als, explains Dr. Baumann, but about “combining the best of different material worlds”. For years, plastics-based composite materials have been experiencing a boost in the car industry. Storage compartment lid, hood, sliding roof, brakes, attenuator, tie rod, hub cap, heating tubes, seat belts, driving belt, air filter, valve lid, ignition distributor cap, spark plug connector, connector strips, airbag, headrests, seat covers – approximately 2000 vehicle parts in body, chassis, motor electrics or interior features are today made from plastics or are based on plastics and the trend continues to increase. There are good reasons for this, as the following three examples show. Better functionality: an intake manifold made from synthetic material increases the efficiency of the motor by optimizing the flow properties. Fuel tanks made from plastics can be designed according to individual requirements, which not only reduces the weight of the vehicle, but the available room is also used efficiently and visually attractively. Mufflers made from synthetic material are approximately 13 kilograms lighter than conventional equivalents and only need 50 percent of their space. The waste gas pressure is reduced by half, which means a reduction of carbon dioxide emissions or an enhancement in horsepower. Brought to the point: savings of 0.2 liters fuel per 100 km, transferred to a German car fleet of 42 million cars, results in total savings of 8.4 million liters fuel per 100 kilometers driven. This makes both drivers and the environment happy. The aviation industry, too, has learned to appreciate the added value of synthetic materials in terms of cost and fuel reduction. For example, 25% of the Airbus A380 consists of plastics reinforced with carbon-fiber. The result: 15 percent less kerosene consumption. Airplane manufacturer Boeing goes even further: “The amount of synthetic materials of the Boeing 787 Dreamliner is already at 50 percent, which leads to considerably lower emissions of environmentally harmful gases during operation, says Dr. Baunemann. Green energy needs plastics Clean, environmentally friendly ways of producing energy also cannot get around polymer materials: “The rotors of wind turbines are made of plastics and synthetic materials are the base of commercial solar systems for energy production,” the managing director reports. Polymers furthermore play a central role in fuel cell technology. By the way: even though the majority of all synthetic materials is still produced from crude oil and natural gas, renewable raw materials are increasingly utilized. Dr. Baunemann:”Fossil resources are simply too limited for the plastics industry to solely rely on them.” However, without plastics, says Dr. Rüdiger Baunemann, the future is not possible: “This is the material of the 21st century.” Copyright: GDeußing

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  • Artificial muscle as shock absorber

    Electro-active elastomers . Source: Fraunhofer Institut Engineers are working on intelligent materials that can diminish vibrations and extract power from the environment. These electro-active elastomers could dampen annoying vibrations in a car, for example, or supply wireless power to sensors in otherwise inaccessible places. It is not very fun to ride a bicycle on a street plastered with cobblestones. At least the bike has a saddle seat filled with silicone. That lessens the shocks and bumps, and counteracts some of the annoying vibrations. In a professional‘s eyes, the material in the saddle is an “elastomer” – a material that is yielding and malleable, like a rubber band. Engineers at the Fraunhofer Institute for Structural Durability and System Reliability LBF in Darmstadt are now working on the next generation: They are designing components made of elastomers that actively respond to unwanted vibrations, and dampen them more effectively than ever before. Elastomers have been used in engineering for decades, such as shock absorbers in mechanical engineering or in the bearings for vehicle engines. Until now, they have had a purely passive effect on vibrations or impact collisions. It would be more effective if the elastomers were to respond proactively and counteract vibrations. In the same way a tennis player slows down the ball on a drop shot by pulling back on her racket, an active elastomer draws out the energy from the vibration in a targeted manner by swinging in precise push-pull mode. Theoretically, this would make the vibration dissipate completely. Elastomers vibrate under alternating current There are already materials that are good for this purpose. “They are called ‘electroactive elastomers’,” explains LBF scientist William Kaal. “They are elastic substances that change their form when exposed to an electrical field.” The trick: apply an alternating current, and the material starts to vibrate. If there are smart electronics controlling the elastomers, making them vibrate precisely in push-pull mode, then unwanted vibrations in equipment or an engine will dissipate for the most part. To demonstrate that the principle works, the Darmstadt-based researchers created a model. Smaller than a pack of cigarettes, it is comprised of 40 thin elastomer electrode layers. The experts call it a “stack actuator.” “The challenge was the design of the electrodes with which we apply the electric field to the elastomer layers,” as Kaal‘s colleague Jan Hansmann clarifies. Usually, electrodes are made out of metal. However, metals are relatively rigid, which impedes the deformation of the elastomer. Fraunhofer experts deliver an elegant solution to the problem: “We put microscopic-sized holes in the electrodes,” says Hansmann. “If an electric voltage deforms the elastomer, then the elastomer can disperse into these holes.” The result is an actuator that can rise or fall a few tenths of a centimeter upon command – several times a second, in fact. To demonstrate these capabilities, William Kaal attaches a small mechanical oscillator to the device. When he turns it on, the oscillator begins shaking powerfully – the actuator has hit its resonance frequency perfectly. On the other hand, the instrument can actively absorb vibrations: If the oscillator is tapped by hand, it quickly settles down when the actuator vibrates in push-pull mode. The LBF engineers believe one potential application for their stack actuator can be found in vehicle construction. “An engine‘s vibrations can be really disruptive,” says William Kaal. “The vibrations are channeled through the chassis into the car‘s interior, where the passengers start to feel them.” Of course, engines are installed meticulously, and yet: “Active elastomers may help further reduce vibrations in the car,” Kaal asserts. When vibrations turn into power The function of the stack actuator can also be reversed: rather than produce vibrations, the device can also absorb vibrations from its surroundings to produce energy. The principle works, and researchers have proven it. As they placed an electromagnetic oscillator on their stack actuator, it converted the vibrations into power. “That would be of interest, for example, if you wanted to monitor inaccessible sites where there are vibrations but no power connections,” Jan Hansmann believes – as he cites an example: the temperature and vibration sensors that monitor bridges for their condition. The stack actuator technology has been largely perfected: “The manufacturing process can be readily automated. That is important for industrial mass production,” thinks Kaal. Nevertheless, endurance tests still have to show what the long-term viability of the intelligent actuators is like. Ultimately, they must be able to withstand harsh environments of the kind found in the engine compartment of a car.

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  • The life and work of Hermann Staudinger. Part 3: 1933-1945

    By Markus Weber and Guido Deussing The life and work of Hermann Staudinger Part 3: 1933-1945 Hermann Staudinger started a new phase of his life in the 1930s: his theory about the macromolecular structure of polymers – which was hotly contested in the initial stages – finally received the recognition it deserved. While the opposition he faced from the scientific community decreased, new storm clouds developed in 1933, when the Nazis assumed power. What did the totalitarian state have in store for Staudinger as head of the chemical institute at Freiburg University? And how did he position himself politically with respect to the fascist rulers, who operated in line with their well-known motto: “If you’re not for us, then you are against us”? Hermann Staudinger started a new phase of his life in the 1930s: his theory about the macromolecular structure of polymers – which was hotly contested in the initial stages – finally received the recognition it deserved; the outsider who was considered to be suspicious became a celebrated iconoclast with a worldwide reputation. More and more of the organic chemists among his colleagues embraced Staudinger’s “giant molecules” concept. The same was true of Kurt Hans Meyer and Hermann Mark, who Staudinger said were his main opponents in the priority dispute, because their primary valence chains competed with his macromolecules (see Part 2 of this series). The “new micellar theory” propagated by Meyer and Mark was soon to be history; the two physical chemists gradually abandoned it as they made progress in their work (see Staudinger 1961, 93, and Priesner 1980, 214 and 380). While the opposition he faced from the scientific community decreased, new storm clouds developed in 1933, when the Nazis assumed power. What did the totalitarian state have in store for Staudinger as head of the chemical institute at Freiburg University? And how did he position himself politically with respect to the fascist rulers, who operated in line with their well-known motto: “If you’re not for us, then you are against us”? Accusation of “anti-German sentiment” Krüll (1978a), 48 claims that Staudinger profited from the Nazi regime and its racial ideology, although the latter did not encourage this. “After 1933, Staudinger suddenly benefited from the fact that Mark and Meyer were Jews. In the context of ‘German natural science’, Staudinger was of course a priori in the right here, at least within the area controlled by the Nazi Party”. This assessment requires correction to the extent that Staudinger was neither dependent on support from any anti-Semites nor did he receive any such official support with respect to the scientific priority dispute. The Nazis did not by any means come to Staudinger’s defence against anyone; on the contrary, they attacked him themselves, accusing him of “anti-German sentiment” and making him a public enemy. One of the first to investigate Hermann Staudinger politically was the philosopher Martin Heidegger (1889-1976), a new member of the Nazi party and the first Nazi vice-chancellor of Freiburg University (period of office: 23. April 1933 to 23. April 1934). Heidegger did not just denounce colleagues in his faculty, particularly those of Jewish origin, such as the philosopher Richard Hönigswald (1975-1947), who lost his chair at Munich University because of a negative report compiled by Heidegger (Heidegger 1933, 161: “particularly dangerous brilliance”, “vacuous dialectics”). Heidegger also denounced scientists from all other faculties and “races” who were identified as political opponents, particularly Communists and Social Democrats, but also people who were not members of any party but did not express Nazi / soldierly views. A description that – in Heidegger’s opinion – fitted Staudinger; the research done by the vice-chancellor produced so much incriminating evidence of this that he initiated impeachment proceedings against Freiburg’s star chemist: • In July 1933, vice-chancellor Heidegger contacted the physicist Alfons Bühl (1900-1988) who had qualified to be a professor in Freiburg but was now teaching at the Swiss Federal Institute of Technology in Zurich, where Staudinger used to work. Bühl was supposed to get to the bottom of “various rumours” (Ott 1992, 209), particularly the rumour that Staudinger had “acted as an advisor to enemies abroad” during the First World War, with respect to “the production of chemicals of importance to the war effort, particularly [...] dyes and pigments” (ibid., 203). This had at any rate been investigated by the German Embassy in Bern at the time. Bühl was unable to find out anything specific and was referred by a member of the staff of the Consulate General in Zurich to the Baden district authorities in Karlsruhe, where “material about Mr Staudinger from the year 1919 was available” (ibid., 209). – In this context, Heidegger’s biographer, Hugo Ott, stresses that the Staudinger affair was definitely attributable to the action taken by Heidegger; the driving force was not, as has often been claimed, the Ministry of Culture in Karlsruhe, which was only involved later on. Deichmann 2001, 398 writes: “Staudinger never found out that it was Heidegger who denounced him in 1933; his wife, Magda Staudinger, heard about it in 1982 via an article by Hugo Ott in the Badische Zeitung newspaper.” (cf. Ott 1992, 207) • On 29. September 1933, the head of the university department at the Baden Ministry of Culture, Eugen Fehrle (1880-1957), was in Freiburg and was “informed” by Heidegger about “incriminating political material about Hermann Staudinger [...]” (ibid., 202). Just one day later, Fehrle submitted a report to the Freiburg police – 30. September was the deadline for the initiation of proceedings for political reasons on the basis of the Act passed on 7.April 1933 to restore the civil service, which enabled the Nazis to remove civil servants who had made themselves unpopular from their offices arbitrarily. The investigations against Staudinger were then taken over by the secret police in Karlsruhe under the pseudonym “Sternheim Project” (cf. Farías 1989, 177). It says in the files that Heidegger “was unable [...] to provide the secret police with any useful information” (Ott 1992, 202); instead of this, he merely passed on rumours. In the subsequent months, the secret police therefore collected “three extensive bundles of files” (ibid., 202) from documents at the Karlsruhe district authorities – Staudinger worked at Karlsruhe Technical University until 1912 – from the German Consulate General in Zurich and from the German Embassy in Bern. Farías 1989, 177-178 writes: “The material obtained by the secret police [...] was sufficient for a case to be initiated against Staudinger in Karlsruhe.” Heidegger demands dismissal ● On 6. February 1934, Heidegger was “asked” by the Baden Ministry of Culture “to submit comments urgently, enclosing the files”, because “Paragraph 4 of the Act (to restore the civil service, editor’s note) must be applied, if necessary, by 31. March 1934” (Ott 1992, 204). The Freiburg vice-chancellor replied on 10. February, i.e. only four days later, and argued in favour of a dismissal of Staudinger from his position as a civil servant. Among other things, Heidegger’s letter says: “All the reports by the German Consulate General in Zurich from the War [...] talk about the disclosure by St. of German chemical manufacturing processes to foreign (enemies). [...] Staudinger has [...] ‘never denied that he was in complete opposition to the national movement in Germany and has declared on numerous occasions that he will never defend his fatherland with weapons or by service in other forms’. [...] No less incriminating evidence is the fact that Staudinger wrote a petition for the pacifist Dr. med. (Georg Friedrich, editor’s note) Nicolai (1874-1964, editor’s note), who had refused to take the oath of allegiance, in Zurich in 1917. [...] These facts alone require application of Paragraph 4 of the Act to restore the civil service. Since they have become and remained known to large numbers of people in Germany since the discussions about the appointment of Staudinger to the position in Freiburg in 1925/26, action also needs to be taken in order to protect the reputation of Freiburg University [...]. Dismissal is likely to be the better option rather than retirement. Heil Hitler! Heidegger” (quoted in Ott 1992, 205) The Baden Minister of Culture, Otto Wacker (1899-1940), supported Heidegger’s demand on 22. February 1934 (see Farías 1989, 178, Ott 1992, 206, and Deichmann 2001, 397) and proposed: “The Ministry of State is asked to suggest to the Reich Governor that Professor Dr Hermann Staudinger [...] is dismissed from the Baden civil service.” (quoted from Ott 1992, 206) Staudinger was “no longer a suitable teacher for German academic youth; I consider that the conditions for removal from Freiburg University in accordance with § 4 of the Act (to restore the civil service, editor’s note) are satisfied” (ibid.). The fact that Staudinger was an annoyance to staunch Nazis was attributable to more than mere rumours: ● The political background of Staudinger’s family was strongly left-wing. His father Franz (1849-1921) had a doctorate in philosophy, sought to combine the theories of Kant and Marx, published in the “Sozialistische Monatshefte”, was involved in the co-operative movement and maintained personal friendships with such prominent Social Democrats as Eduard Bernstein (1850-1932). Staudinger’s first wife, Dora (1886-1964), née Förster, was also actively involved in the co-operative movement as well as “in the religious-pacifist and religious-socialist circles led by the (Swiss, editor’s note) clergyman (Leonhard, editor’s note) Ragaz (1868-1945, editor’s note), who then lost his position in the ministry” (Ott 1992, 204). Staudinger’s brother Hans (1889-1980), Secretary of State in the Prussian Ministry of Trade, was a member of the Social Democratic Party and was married to the Jew Else Maier (1889-1966). He was immediately dismissed from the civil service and arrested in 1933. In 1934, he was able to emigrate to the USA, where he became Economics Professor at the New School for Social Research in New York (cf. Deichmann 2001, 396-397). – As is generally known, the Communist and Social Democratic Parties were branded as subversive right from the start and their members were persecuted systematically. On the basis of what was known as the Reichstag fire regulation of 28. February 1933, the 81 parliamentary seats held by the Communist Party were revoked on 8. March and the assets of the party were confiscated on 26. May. With reference to the Social Democratic Party, the Reich Minister of the Interior, Wilhelm Frick (1877-1946), called on the state governments to ban the party’s activities on 22. June: “The Social Democrats cannot [...] be allowed to carry out propaganda activities of any kind. [...] The assets [...] that have not already been confiscated in connection with the dissolution of the free unions will be seized. It goes without saying that it is not possible for civil servants and employees who receive salaries, wages or pensions from public funds to continue being members of the Social Democratic Party in view of its treacherous character.” (quoted from http://library.fes.de/fulltext/bibliothek/chronik/band2/e235f1109.html) The Reich Ministry of Justice announced in this context: “Officials who used to be members of these parties must be required to submit a written statement that they no longer maintain a relationship of any kind to the two parties (Social Democratic and Communist Parties, editor’s note), their support and substitute organisations and their representatives abroad. Their attention must be brought to the fact that dismissal is the punishment for the provision of false information” (quoted from Minssen/Walgenbach 1985-I, 171). ● The accusation Staudinger faced that he failed to demonstrate “sympathy for the national cause” was based primarily on his attempts to obtain dual citizenship during his years in Zurich, i.e. after he acquired a Swiss passport in addition to his German one. In his letter of 10. February 1934, in which he demanded Staudinger’s dismissal, Heidegger criticised: “In January 1917, i.e. when the fatherland was at its time of greatest need, St. applied for Swiss citizenship without their being any professional or other necessity for this. Implementation of this plan was prevented by the German Consulate General. [...] On 9.1.1919, i.e. directly after Germany collapsed, St. submitted his request for permission to become a citizen of Switzerland again [...]. Naturalisation occurred on 23.1.20, without German approval being obtained.” (quoted from Ott 1992, 205) This went hand in hand with the accusation of “pacifist sentiment” (Ott 1992, 204): although he was rejected as unfit for military service at the age of 23, Staudinger was examined again by military doctors during the First World War at the age of 34 and this time he was merely exempted from military service temporarily. Staudinger probably applied for a Swiss passport in order to avoid being called up, as was to be expected (cf. Ott 1992, 203). This interpretation is, however, contradicted by the fact it took almost two years for Staudinger to do this; his commitment to Switzerland can therefore be interpreted instead as the adoption of a neutral position with respect to the participants in the war, whom he called on in 1917 to cease all fighting and to initiate peace negotiations. “Supporter of the national uprising” Staudinger had nothing to win by defending his position. So he decided to say during his hearing at the Baden Ministry of Culture on 17. February 1934 that he “abandoned his earlier political views a long time ago” (see Ott 1992, 207). “The accusation that he harboured ‘anti-national sentiments’ could not be made against him any longer since he started working in Freiburg; on the contrary, he had ‘welcomed the start of the national revolution enthusiastically.’” (Deichmann 2001, 397) A tactical manoeuvre, that the Nazis were reluctant to believe – Heidegger, for example, was very sarcastic about the fact that “Staudinger now claims to be a 110% supporter of the national uprising” (quoted from Ott 1992, 205). Deichmann 2001, 397 confirms this: “He was unable to refute the allegations of anti-German behaviour during the First World War by adopting this defence strategy.” (cf. Ott 1992, 206) Staudinger therefore responded again by rejecting descriptions of himself as “anti-German” and a “pacifist”: ● Staudinger was forced to contend with the accusation that he had abandoned Germany and “had been abroad for too long” (Minssen/Walgenbach 1985-I, 193) until the end of the 1930s. He tried to refute it by pointing out how he maintained close contacts to German industry during his time at the chemical institute at the Swiss Federal Institute of Technology in Zurich: “’Throughout this period from 1912 to 1926, I maintained relationships to German industry and carried out a number of major projects with the same. [...]‘ Staudinger lists: 1. Pest control, 2. Pepper synthesis, 3. Trials to synthesise an artificial coffee aroma. All of these projects were connected with the production of substitutes during the First World War. [...] ‘I would also like to note that the desire to return to Germany was the only reason for me to accept the appointment offered (in Freiburg, editor’s note) in 1926, in order to continue my work about macromolecular chemistry, which I considered and still consider important, there. The Swiss educational authorities had made me attractive offers to persuade me to stay. I doubled the size of the laboratory in Zurich during my time in office there, whereas the Freiburg laboratory offered far less appealing working conditions in every respect at the time – a situation that has only changed fundamentally now.’” (letter from Staudinger dated 7. November 1938, quoted from Minssen/Walgenbach 1985-I, 193) ● Staudinger tried to prove the Nazis wrong in accusing him of being a pacifist by disassociating himself from fundamentalist positions: “He was not a pacifist in the strictly religious sense of the Quakers or conscientious objectors; he was, instead, a pacifist ‘because of my convictions about the importance of technology in armed combat’” (Ott 1992, 207). To defend himself against the attempts made to discredit him, Staudinger now followed the arguments he put forward back then – which he insisted were strictly scientific and thus non-political – by an article written for the “Völkische Zeitung” newspaper in Düsseldorf, which appeared on 25. February 1934 with the title “Die Bedeutung der Chemie für das deutsche Volk” (= “The importance of chemistry to the German people”). He had reprints of this newspaper article sent to the Baden Minister of Culture, Otto Wacker, and the Nazi Mayor of Freiburg, Franz Kerber (1901-1945) (see Otto 1992, 207, and Deichmann 2001, 398). This article includes Staudinger’s following statements: “The German people only have two options open to them, in order to survive. On the one hand, as many products as possible must be obtained from the land available by taking particularly good care of it. Attempts also need to be made, on the other hand, to reduce imports. [...] If German technology can be expanded [...] in the next few years, major steps will have been taken to give Germany an independent position in the world.” (quoted from Minssen/Walgenbach 1985-I, 182) No capitulation to the Nazis, but instead – as Ott 1992, 207 says – “a ‘goodwill move’ by which Staudinger accepted the policy of independence adopted by the Nazi government and tried to recommend himself as a contributor on the basis of his scientific know-how. As a result, “he could now have ‘an extremely wide range of possible activities’ in the Nazi state” (ibid.). Sensational turn of events All in all, Staudinger’s attempts to defend himself against the attacks by the Nazis do not appear to be a particularly convincing way to avoid dismissal from the civil service. What was, at least, dropped was “the charge of the betrayal of manufacturing secrets” to foreign enemies (Ott 1992, 205, cf. Deichmann 2001, 397). Staudinger himself was not, however, in a position to save his neck completely. What helped him, in the final analysis, was his professional reputation. Heidegger himself advised on 5. March 1934 – reluctantly – that “consideration is given to the position that the person in question holds in his scientific field abroad”, although not without mentioning “that there cannot of course be any change in the facts of the matter. What is only involved here is the avoidance if at all possible of a new foreign policy problem” (quoted from Ott 1992, 208). A retreat, although he continued to insist that sanctions needed to be imposed on Staudinger, albeit in a milder form: Heidegger suggested that Staudinger should not, after all, be dismissed without pay but be allowed to retire instead (cf. Farías 1989, 178, and Ott 1992, 209). This “act of mercy” (Ott 1992, 209) would of course have meant the end of Staudinger’s career in Germany too. The last word had not been spoken, however, and the scandal is avoided: “Various interventions – the Nazi mayor of Freiburg, Dr Kerber, expressed support for Staudinger, for example, as did – presumably – the chemical industry – with the result that the (Baden, editor’s note) Ministry of Culture withdrew the application (made on 22. February 1934, editor’s note).” (Deichmann 2001, 397; cf. Ott 1992, 207) A sensational turn of events, but not without the Nazi authorities humiliating Staudinger again to save face: he himself “was required to submit the official application for dismissal from the Baden civil service, which was then filed for six months. Since the accusations were based on a situation that took place a long time in the past, ‘an official decision’ about the application for dismissal would only be ‘made if concerns arose again.’ This was not the case [...] and Staudinger was, as agreed, allowed to withdraw his application in October 1934. The case was closed, although it was a close shave for Staudinger.” (Ott 1992, 208; cf. Farías 1989, 178, and Deichmann 2001, 398) He continued to be resented just as much even so, because – as Heidegger put it – “there cannot of course be any change [...] in the facts of the matter”. Staudinger realised how thin the ice was on which he was standing. The fascinating question is how he responded to this and what strategy he chose to make himself as untouchable as possible. He stayed put at any rate, rejecting the offer of an appointment at Berlin Technical University, which then chose Franz Bachér (1894-1987) to take over the vacant chair – “an active Nazi and insignificant chemist” (Deichmann 2001, 183). In view of the extent to which he was disliked by the Nazis, the capital of the Reich must have seemed to Staudinger to be a veritable lion’s den, so he felt it was better for him to stay in Freiburg in spite of the crisis he had just faced. The situation there did not ease, however; if anything, it was made even more difficult for him to work: “From June 1933 to October 1936, Staudinger made five trips abroad to various European countries. With reference to his political past, he was, however, asked by the Reich Ministry of Education to turn down invitations to Zurich (1937), Riga (1937) and Rome (to the International Congress for Chemists in 1938).” (Deichmann 2001, 399) A letter from the Reich Minister of Science and Education, Bernhard Rust (1883-1945), to the vice-chancellor of Freiburg University, Otto Mangold (1891-1962), dated 2. November 1938 includes the following statements about this: “I reserve the right to take the decision about applications submitted by Professor Dr H. Staudinger, Director of the Chemical Laboratory at the University of Freiburg i.B., in future relating to the approval of scientific trips abroad. I request that Professor Staudinger is informed in an appropriate way of the fact that it does not appear to me to be desirable for Professor Staudinger to carry out scientific activities abroad until further notice in view of his political past.” (quoted from Minssen/Walgenbach 1985-I, 192) Due to the pressure exerted on him, Staudinger was afraid that he would be marginalised at the international level, so that other scientists would be able to claim responsibility for work that he had done: “In American literature, the situation is already described frequently as if Carothers created high-molecular chemistry”, he complained on 23. November 1934 in a letter to Georg Kränzlein (1881-1943; quoted from Deichmann 2001, 404), “one of the directors of I.G. Farben, who [...] was in charge of the Alizarin Department at the Hoechst factory” (ibid., 399). Following the collapse of the “Third Reich”, Staudinger was to accuse the Nazis – in a memorandum submitted in July 1945 – of weakening Germany’s position as a scientific location and of causing the country to fall behind in the international competitive environment: “Party considerations [...] prevented a major new area of German research (= macromolecular chemistry, editor’s note) from being represented adequately abroad; this is a particularly unfortunate fact, because this area has been given particularly strong support in England and America due to its technical and scientific importance.” (Staudinger 1945, 11) Anti-Semitic pretence In order to be able to carry out scientific research undisturbed, Staudinger tried to make sure that he did not give the authorities any new targets for political attacks or that such attacks were ineffective. He developed a strategy of ingratiating himself with the Nazis, taking a variety of different action in this context. In view of the rejection of his macromolecule concept in the early stages, he claimed – for example – that he was a “victim of Jews” (Deichmann 2001, 404), criticised their alleged dominance in the scientific world and was even willing to use anti-Semitic clichés and slogans. In a letter written on 9. June 1941 to the Cologne businessman Wolfgang Klever (1881-1970), a personal friend and former student, Staudinger spun a yarn about “a completely self-contained clique [...], which formed earlier on before 1933 and still sticks together today. It is very difficult to prevail against these Jews abroad and here in Germany.” (quoted from Priesner 1980, 329) What Staudinger failed to mention here was, on the one hand, the fact that it was a Jewish winner of the Nobel Prize in Chemistry, Richard Willstätter (1872-1942), who was the first to subscribe to his macromolecule theory. On the other hand, he dug up the hatchet – which had really been buried for years – and attacked his former opponents Kurt Hans Meyer and Hermann Mark (see Part 2 of this series), because they were the target of the criticism he expressed. Jaenicke 2003, 604 talks in this context about “bogeymen”. There can be question of the two chemists ever conspiring to oppose Staudinger and there was certainly no threat to him from them since they emigrated: from 1932 onwards, Meyer taught at Geneva University, after his appointment to Berlin Technical University – which was as good as certain – was thwarted by Staudinger himself (see Priesner 1980, 306-307, and Deichmann 2001, 255). After permission for him to teach at Vienna University was withdrawn and he was imprisoned for a time, Mark escaped from the Nazis by moving to the USA in 1938, where he started working at the Polytechnic Institute of New York in Brooklyn in 1940 (cf. Priesner 1980, 327, and Deichmann 2001, 183). Staudinger did not stop presenting himself as a victim even so. In June 1938, for example, he wrote – “in a distortion of the truth” (Deichmann 2001, 406) – the following letter to the Reich Ministry of Education, after this Ministry had prohibited him from attending the International Congress for Chemists in Rome: “My position in the German chemical community is being influenced very unfavourably by a scientific battle that I [...] have had to fight against what are primarily Jewish circles. The field of high-molecular substances (rubber, cellulose, plastics) that is involved here is of both scientific and technical significance. My results were rejected at the 1926 conference for natural science researchers in Düsseldorf, since numerous Jewish scientists had completely different views at the time. From 1928 onwards, they then – above all K. H. Meyer – tried to take over major results of my work without mentioning me, something that is standard practice in the scientific world otherwise. Since I was unable to accept this, an argument began that continued for years and was very disadvantageous for me personally, since K. H. Meyer as a member of the Management Board of I.G. Farben-Industrie and director of the plant in Ludwigshafen held a very influential position in the German chemical community. The success that Jewish circles have in the scientific world is based on the same method that they apply in other areas too: emphasising their own achievements and expressing biting criticism of others. [...] They make their very negative influence felt at domestic and foreign congresses, particularly – for example – at the International Congress for Chemists in Madrid in 1934. These circles, that I opposed in Madrid, will be particularly delighted by my failure to attend the congress in Rome. My only regret is that the battle I have been fighting for decades to overcome the Jewish influence in this important chemical field has as a result to all intents and purposes been fought in vain.” (quoted from Deichmann 2001, 406-407) This was a shot that backfired: the Reich Ministry of Education confronted I.G. Farben with the contents of the letter and asked Georg Kränzlein – who has already been mentioned – from the Hoechst plant to comment. Kränzlein was “disgusted by the criticism that Staudinger expressed about I.G. too via the accusations about Meyer” and “rejected Staudinger’s claim of having become a victim of Jewish intrigues as untenable” (Deichmann 2001, 407). But what prompted Staudinger to make further offensive anti-Semitic comments (“self-contained Jewish clique”) about Meyer and Mark three years later, as has already been mentioned? The occasion was the appearance of the textbook “High-Polymer Chemistry” written by the two of them, “which, in spite of the fact that both were Jews by Nazi definition, was published in Leipzig in 1940 and was reviewed positively” in the magazine “Die Naturwissenschaften” (Deichmann 2001, 408-409). It says in this “with reference to Staudinger: ‘Read the section about viscosity. Although a direct and simple relationship between molecule size and chain length is rejected with convincing arguments, the writer specifically emphasises the viability of viscosity measurement for evaluating the solutions of high-molecular substances. This chapter will be particularly instructive to those who go as far as to virtually confuse chain lengths or the degree of polymerisation and indicators derived from viscosity.’” (ibid., 409) Priesner 1980, 331 concluded that all this was “an unmistakable indication that Staudinger continued to see his fellow-chemists as enemies” and added: “It is frightening that the small amount of intellectual freedom which still existed in Germany in 1941 was vilified as an intrigue on the part of a group of conspirators” (ibid., 330). Jaenicke 2003, 604 criticises Staudinger’s “attacks ( ) on the Jewish surrounding of German macromolecules by anti-German polymer chains” and “the typical [...] unoriginal adoption of other people’s ideas and culture for commercial purposes” as “embarrassing, [...], obsequious and opportunistic” and concludes: “Genius does not protect against stupidity” (ibid.). Staudinger did not make himself many friends among the Nazis with his anti-Semitic pretence either. I.G. Director Georg Kränzlein, who subsequently became the regional head of the Nazi technical authorities in Hesse-Nassau and SS-Hauptsturmführer (= captain)” (Deichmann 2001, 406), reprimanded him: “In my opinion, you make the mistake of arguing with Jews the whole time. [...] There is no need for you to start polemic discussions with Jews, because by doing so you give them too much honour. Avoid and ignore these people, because otherwise you let them have the last word over and over again, which regularly harms you. We disassociate ourselves systematically from the Jews, as the Nuremberg Laws prove. By doing this, we send them back to where they came from. Why don’t you disassociate yourself in the scientific world? Here too, they need to return to the intellectual ghetto they came from, back to their Talmud, which they are incapable of escaping from. [...] Instead of this, you incite the Jews to band together against you more and more and this will harm you in the long run. [...] Now it is your duty not to mention the Jews again at all, definitely not allowing yourself to continue a polemic debate with them.” (Letter of 3. June 1936 from Kränzlein to Staudinger, quoted from Priesner 1980, 318; cf. ibid., 317, and Deichmann 2001, 405) Staudinger nevertheless continued to do everything in his power to be considered an anti-Semite: “As early as 1936, he had worried that too many ‘non-Arians’ could study at his institute; and in May 1942, he again expressed misgivings to the vice-chancellor in writing – now that there were no more Jews at German universities – about too many ‘half-breeds’ among the chemistry students” (Martin 1994, 11, footnote 32). No chance of a party membership book The aim of “his application for membership of the Nazi party” (Schnabel 1991, 230) was to eliminate any doubts about his loyalty to party principles, but this application was rejected, officially “because of former membership of a Masonic Lodge” (ibid.). A family tradition – Staudinger’s father was “Grand Master of the Grand Lodge ‘zur Eintracht’” (Krüll 1978b, 225). Incidentally: Staudinger was only registered as a passive member of the SS because the latter “blackmailed him [...], forcing him to pay protection money from time to time” (Jaenicke 2003, 604). Even though Staudinger – as has been indicated – did everything in his power to make the impression of being a staunch follower of the Nazis, Krüll 1978a, 48 confirms that he was “no Nazi”. Rightly so, because Staudinger generally showed no interest at all in Nazi ideology in his position as head of the institute and could not have been more politically incorrect in his actions, protecting students and assistants who were disapproved of by the Nazis: ● Staudinger came to the defence of Ernst Trommsdorff (1905-1996), “one of my best assistants and staff members” (quoted from Minssen/Walgenbach 1985-I, 176), who he supervised when he obtained his doctorate in 1932 and who was now in danger of being dismissed from the civil service because of his “Jewish origins”. On 1. August 1933, shortly before he himself became a target, Staudinger wrote a letter to vice-chancellor Martin Heidegger: “Since they work together, there is a strong feeling of solidarity in my laboratory between the laboratory staff, the lecturers, the assistants and the students. Dr Trommsdorff is a fully integrated member of this team. Last year, for example, he and seven other assistants helped me to write a book about rubber and cellulose. This community spirit will be destroyed if a member of the team is required to leave in these circumstances.” (quoted from Minssen/Walgenbach 1985-I, 175) In another line of argument, Staudinger deliberately tried to portray Trommsdorff as someone who sympathised with the Nazi movement, with the aim of taking the wind out of the sails of those who wanted to harm him: “In all his opinions, Dr Trommsdorff has a very positive attitude towards the state as it is today. One of his brothers is a member of the Hitler Youth organisation. The position Dr Trommsdorff holds among his comrades is made most clear by the fact that he has acted as group leader in military sports exercises. I have discussed this matter with Dr (Ernst Otto, editor’s note) Leupold (born in 1903, editor’s note) too, who is the representative of the assistants in the laboratory for which I am responsible; he agrees with my view that the assistants and students do not feel that Dr Trommsdorff should be covered by the [...] Act (to restore the civil service, editor’s note). This statement was important to me, since Dr Leupold has been a member of the SS for a long time now and has studied Nazi issues intensively.” (quoted from Minssen/Walgenbach 1985-I, 174) It may well have been quite a clever move “to make progress with his own cause” (Minssen/Walgenbach 1985-I, 191) for Staudinger to “assume or use moral concepts followed by the ruling class” (ibid., 183). Anyone who believes that “one does not change at all in the process” (ibid, 191) is subject to an error of judgement, however – like it or not, one’s own personality is distorted as a result. Staudinger did not succeed in preventing Trommsdorff from being dismissed; the latter was unable to pursue a normal scientific career in the Nazi state. “I would have liked him to have qualified as a professor here, but this is not unfortunately possible at the moment”, Staudinger regretted in a letter of recommendation to the British chemist Sir Robert Mond (1867-1938), with which he tried to help his assistant to make a career for himself in England (quoted from Minssen/Walgenbach 1985-I, 176). Instead of this, Trommsdorff joined Röhm und Haas AG, Esslinglen and Philadelphia, where he became Research Manager in 1939. ● “Not only Staudinger was accused of spending too much time abroad; one of his staff was among those who faced the same charge. Political pressure had increased in the meantime. No-one needed to be an ‘enemy of the state’ any more [...] in order to suffer professional problems. It was sufficient for someone not to stand up for Nazi ideology actively enough, ‘to fail to show commitment to the Nazi state’”, as can be read in Minssen/Walgenbach 1985-I, 193-194. In June 1941, Dr Rolf Mohr (born in 1910), one of Staudinger’s staff, who he wanted to make his scientific assistant, was the victim. The application to this effect was initially approved by the dean of the natural science/mathematical faculty, but the Nazi leader of Freiburg’s lecturers (Eduard, editor’s note) Steinke (1899-1963, editor’s note) raised “concerns for political reasons” (ibid., 195): It is a well-known fact that Mohr obtained all of his education and training outside Germany (= in Switzerland; editor’s note). During the many years of his activities here (= since 1933, editor’s note), he has demonstrated no commitment to the Nazi state [...]. He only recently joined a Nazi unit and has been in the armed forces since the spring of this year. Since the lecturers’ leadership is of the opinion that Mohr is not a suitable candidate for an academic career in view of his overall attitude and views, I do not consider it justified to appoint him to the position of scientific assistant; instead of this, I would be grateful if he were allowed to continue holding such a position on a provisional basis for the time being.” (Official party letter written by Steinke to the vice-chancellor’s office at Albert Ludwigs University in Freiburg on 10. June 1941; quoted from Minssen/Walgenbach 1985-I, 196) Vice-chancellor Wilhelm Süss (1895-1958) agreed with Steinke’s assessment: “Dr Rolf Mohr cannot be appointed to be a scientific assistant yet. Dr Mohr has been evaluated unfavourably in political appraisals in the past. Since he only recently joined a Nazi unit, a lengthy probationary period will be necessary before any change is made in the current assessment of his political views. I would be grateful if Dr Mohr was to continue holding a position as assistant on a provisional basis.” (Letter written by the vice-chancellor to Staudinger on 30. June 1941; quoted from Minssen/Walgenbach 1985-I, 196) In response to this, Staudinger threatened to the vice-chancellor on 5. July “to inform Dr Mohr about the contents of your letter, since he has turned down attractive technical positions in the hope of being able to qualify for a professorship here” (quoted from Minssen/Walgenbach 1985-I, 197). Staudinger was not allowed to inform Mohr about the arguments against his appointment as an assistant in writing; he “is instructed to make contact with the lecturers’ leader before taking further action” (ibid., 198). It has been lost in the mists of time exactly how the Mohr issue was resolved in the Third Reich. What is definite is that Mohr did not qualify for a professorship in Freiburg until 1946 with a thesis “About the stabilisation of cellulose nitrates”. ● In June 1942, Staudinger’s “half-Jewish” student Gerhard Bier (1917-2003) – whose mother was a Jew – was prohibited from completing his chemistry degree, after he had already been forced to discontinue studying medicine elsewhere in 1939. However, the Freiburg “vice-chancellor Süss and Professor Staudinger make it possible for him to stay another few months to graduate.” (Deichmann 2001, 86) Bier remembers: “There were a number of other ‘half-Jews’ who studied chemistry apart from me. After the final exams, Staudinger said to me: ‘If you want, I can find out whether you can work here.’ He phoned the military research authorities responsible and received approval to deploy me as a scientific professional for work in the macromolecular research institute that was of importance to the war effort. I was paid as an untrained scientific assistant, i.e. received 100 RM per month.” (quoted from Deichmann 2001, 86) Bier managed to graduate in 1942 (cf. Deichmann 2001, 412), but then things got too dangerous for him in Germany in 1944, so that he fled to Switzerland (ibid., 86), where he completed a doctorate at Bern University in 1946. Two different political faces In view of all this, Staudinger’s behaviour in politically difficult contexts must be considered contradictory. While he was a conformist at some times, he was a troublemaker at others; all in all, he remained unpredictable, managing not only to express politically correct views with impressive vehemence but also to step out of line subversively. Which means that he acted neither as a model Nazi nor as a figure with whom anti-fascists could identify. In the end, the Nazi regime abandoned the strong reservations against him even so and came to terms with the man who was originally reviled as a “traitor to his country”. The turning point came in 1940: a separate research department for macromolecular chemistry was established at Staudinger’s institute and was affiliated to the chemical laboratory at the university – after the institute had already been expanded twice in 1933 and 1937, “in order to create additional capacities for the [...] growth in macromolecular chemistry” (Heimlich 1998, 84). Staudinger was to head this department, which was the first in Europe to be devoted exclusively to the new area of research into polymer sciences, until he retired in 1951. After this, he remained in charge for another five years on an honorary basis. The ban on foreign travel was lifted in 1940 too, when Staudinger’s “name was cleared completely at the political level” (Deichmann 2001, 399). Reich Minister of Education Rust received the following letter from the head of the scientific authorities at his ministry, represented by Otto Wacker, on 26. January 1940: “The district controller in Freiburg has informed me that he has decided to deploy Professor Staudinger politically to a certain extent too in view of his impeccable conduct in recent years. He will as a result be speaking to a selection of political leaders for the first time in the next few days. The district controller therefore considers that the Staudinger case is now closed completely. At the same time that I am informing you about this fact, I think that I am in a position to express the opinion that no fundamental objections should be raised any more in future to scientific activities by Professor Staudinger abroad.” (quoted from Deichmann 2001, 399) Von 1942 bis 1944 wurde Staudinger zwecks Kulturpropaganda „im vom Deutschland besetzten bzw. annektierten Ausland“ eingesetzt und unternahm in dieser Zeit insgesamt acht Vortragsreisen, unter anderem nach Prag, Mülhausen und Straßburg: „Staudinger hatte sich das Vertrauen der NS-Machthaber erworben.“ (Deichmann 2001, 399; vgl. Schnabel 1991, 230) Promotion of defence chemistry It can be assumed that the sudden change in the Nazis’ position was attributable less to a fundamental re-evaluation of Staudinger as a person and more to an increase in their appreciation of what he had to offer professionally as the “natural science figurehead of Freiburg University” (Martin 1994, 11). This was due to the fact that the organic and polymer chemistry he represented was considered to be of importance to the war effort in 1940 – something that Staudinger’s pupil Gerhard Bier had already benefited from, as has been indicated. Staudinger seized the opportunity and never tired of emphasising that he could – and wanted to – be of use to Germany in the war. In the spirit of the Nazi policy of self-sufficiency, he tried to convince the authorities of his ability “to supplement the chemical arsenal by adding plastics and substitute materials” (Jaenicke 2003, 604; cf. Deichmann 2001, 397, and Westermann 2007, 115). He was also willing to make his laboratory available for the promotion of what was known as defence chemistry. As early as 5. September 1939, four days after the attack on Poland, he wrote to the Freiburg vice-chancellor Mangold: “A number of projects of importance to the war effort have been carried out at the chemical institute here for years now, e.g. in connection with the gas protection department at the Ministry of War and with Draeger-Werke in Lübeck. At the suggestion of the latter, work has been done about mustard gas protection (the original name for the chemical weapon yellow cross was “Lost” [...]) and I am involved in developing a reaction for the detection of traces of Lost. Studying cellulose and nitrocellulose have prompted visits to explosives factories, so that I have become acquainted with problems faced by the explosives industry.” (quoted from Schnabel 1991, 222) On 19. October 1939, Staudinger drew attention to the importance of his work to the war effort and the country in a letter to Rudolf Mentzel (1900-1987), President of the German Research Association (DFG) and a member of the Nazi party since 1925: “He stressed that the findings about the structure of cellulose, e.g. the identification of imperfections in the molecule, are of significance with respect to the production of gun cotton and nitrate powders and emphasised the general importance of his work in relation to the constitution of Buna and chlorinated rubber, which is used as a rust-proofing agent. He quoted projects about an agent providing protection against weapons and a new gas mask as examples of work done by his institute that was of special importance to the war effort. The production of synthetic pepper, which came onto the market in Germany in the First World War, had been started again too. (Peter Adolf, editor’s note) Thiessen (1899-1990, director of the Kaiser Wilhelm institute for physical chemistry and electrochemistry and a member of the Nazi party since 1925; editor’s note) acknowledged that Staudinger’s work was important to the war effort and the country, with the argument that although Staudinger’s research was not of direct importance to the war effort, it was of considerable significance to the raw material situation, because it could at any time lead to practical consequences for the cellulose manufacturing industry, the plastics field etc.” (Deichmann 2001, 411-412) “Staudinger also carried out a research project for the Reich Ministry of Aviation and the commander-in-chief of the air force that focussed on ‘Investigations into nitrocellulose’” (Deichmann 2001, 412), which – according to Gerhard Bier, his pupil at the time – was the area of operation of greatest relevance to the war effort: “Nitrocellulose was an industrial product, the raw material for celluloid [...] and for civil and military explosives as well as for civil and military ammunition fuels. Problems of storage stability arose in the large-scale production of nitrocellulose during the war. For unknown reasons, nitrocellulose or a mixture containing nitrocellulose degenerated occasionally, which led – for example – to premature explosions. By carrying out systematic tests, Staudinger’s staff found out that traces of sulphuric acid in the nitrocellulose were the reason for why the nitrocellulose was not stable in storage. The precondition for high storage stability was to wash out the nitrocellulose thoroughly, in the context of which the sulphuric acid ester groups needed to be hydrolysed too. The sulphuric acid was a necessary component of the nitration mixture. I am not aware of the details of this work. [...] Other work done during the war related to the plastics sector and the synthesis factor sector, e.g. polyamides.” (Letter written by Gerhard Bier to Ute Deichmann on 2.9.1996, quoted from Deichmann 2001, 412) Funding from industry There is no doubt about it: between 1939 and 1945, the most important institute at Freiburg University as far as the war effort was concerned – alongside the physics institute – was the chemical institute (for details, see Schnabel 1991, 223, and Martin 1994, 11, footnote 32) and it received appropriate funding. This funding came from many different sources, with “industry providing far more money for (Staudinger’s, editor’s note) research than the emergency association/German Research Association” (Deichmann 2001, 401): ● “As an external member of staff, Staudinger received RM 10,000 per year from I. G. Farben from 1927 to 1937 for studying rubber and high-molecular natural and artificial substances/plastics. [...] In 1943, Staudinger became an external member of the staff of I. G. again, this company supporting him to the tune of 10,000 RM in both 1943 and 1944.” (Deichmann 2001, 400-401; cf. ibid., 241) Westermann 2007, 68 points out in this context: “This means that he had additional research funds at his disposal that amounted to far more than half of his annual income as professor. Between 1930 and 1932, Staudinger earned RM 1,166.66 per month, increasing to RM 1,350.66 with all allowances." ● “Staudinger’s research into cellulose and other fibres started to receive funding from the emergency association/German Research Association in 1936. He received regular support of between RM 3,000 and RM 12,000 per year until 1943.” (Deichmann 2001, 401). The funds provided by the German Research Association and the Reich Research Council are said ibid., 232 to total RM 66,160 in the period 1934 – 1945. ● “Staudinger’s work [...] was also funded by the Reich economic development authorities as of 1941; the amounts provided are not known.” (Deichmann 2001, 412) This list is in curious contrast to Staudinger’s own statements after the war: “The research activities of the undersigned were made more difficult by the fact that he was viewed unfavourably by the party [...]. Due to the position adopted by the party, other major authorities, such as the Reich Research Council, the Reich economic development authorities, etc., were influenced either to refuse funding for the work at the institute here or only to approve minor financial support.” (Staudinger 1945, 11) Apart from this, Schnabel 1991, 230 criticises the fact that Staudinger makes no mention at all of the research he did that was of importance to the war effort, something which he had played as his trump card during the time of the Nazi regime, in the “Report about the influence of National Socialism on the teaching activities of the chemical institute”, which has just been quoted above. In his review of the “Third Reich”, Staudinger criticised party-political nepotism in the making of appointments to scientific and university administration positions and the lack of funding for young academics: “In my practical experience, it was frequently the case during the Nazi period that qualified assistants contemptuously rejected suggestions that they pursued an academic career and opted instead to accept technical positions – not just for financial reasons but also and primarily due to the uncertainty of an academic career because of intervention by the Nazis; during this time, the institute director was unable to guarantee even the most capable of chemists a successful academic career, as the official controller responsible for the students and lecturers as well as the head of the training camps had much greater influence than the performance of the applicant. A successful academic career was as a result dependent more on party activities than on scientific achievements.” (Staudinger 1945, 7) Veil of silence After 1945, it was not unusual for chemists to cast a veil of silence over their involvement in the crimes of the Nazi regime. Deichmann 2001, 414 brought up this painful subject: “In contrast to prominent German physicists, who professed after the war that they had not been in favour of the production of the atomic bomb for moral reasons, neither Staudinger nor other chemists claimed that they were unable to synthesise an artificial fibre, an explosive, a poison gas or an antidote because they had not wanted to for moral reasons. They were honest about this. However, Staudinger (and all his fellow chemists) failed to comment on the enormous crimes that were committed with the involvement of chemists. [...] The killing of mentally disturbed Germans by carbon monoxide and of European Jews by Zyklon B (is, editor’s note) not mentioned.” The life and work of Hermann Staudinger (part 4): 1945-1965 References

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  • A plastic that remembers

    Source: Bayer Material Science A new thermoplastic polyurethane (TPU) developed by Bayer MaterialScience together with the BAM Federal Institute for Materials Research and Testing in Berlin, Germany, shows that plastics can also have a memory. Parts made of such a plastic can be temporarily reshaped and fixed in this shape. When heated to a certain temperature known as the switching temperature, they “remember” their original shape and return to it virtually unchanged. In the case of the new SMP thermoplastic polyurethane (TPU), the switching temperature is approximately 40 °C. The abbreviation SMP stands for the English designation for such plastics: Shape Memory Plastics. “Given this special property, there are virtually no limits to the potential applications for the plastic,” says Jürgen Hättig, Head of Business Development for TPU at Bayer MaterialScience. “We can imagine applications in areas ranging from mechanical engineering and the automotive, textile, sports and leisure industries to toy manufacturing and aerospace engineering.” Possible applications include the easy repair of damaged bodywork parts using a hair dryer, remote temperature sensors, artificial muscles, hinges, self-loosening screws, packaging and shrink tubing. Self-erecting film tunnels for agriculture The two partners recently submitted a patent application for a possible application in the area of functional film tunnels and self-erecting structures. Film tunnels in a field act like greenhouses and accelerate the growth of lettuces and vegetables so that these can be harvested sooner than is possible if allowed to mature in the “classic” manner under the open sky. While it is easy to lay flat films on a field, erecting a permanent tunnel with films can be a time-consuming and costly operation. This is an opportunity for the new shape memory polymer. Profiles made of the new TPU plastic that have temporarily been brought into a flat shape are fastened to the transparent film. After the film has been laid on the bed, all that's left to do is to heat the profiles to the switching temperature. They “remember” their bent, permanent shape and pop up to form a half-tunnel, lifting the films with them. The mini-greenhouses are then ready for use. Counterfeit-proof labels with QR codes The new material could also prove useful in product and brand protection applications. The BAM has used the TPU product to develop labels with engraved and colored quick response (QR) codes (picture above). The codes can only be read if the labels are in their permanent shape. “The labels are thus very well suited as a means of storing information to mark and identify products in a way that is very difficult to counterfeit,” says Dr. Thorsten Pretsch, Head of the BAM department for the investigation of shape memory polymers. The project for labels with switchable readability is funded by the German Ministry of Education and Research. Because the TPU material is free from plasticizers and antihydrolysis agents, it is also suitable for food contact applications. It also boasts all the typical advantages of TPU, such as high abrasion resistance, flexibility and good chemical resistance. Source Bayer MaterialScience

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  • Biobased plastics – sustainability well on the way

    Biobased plastics – sustainability well on the way Kristy-Barbara Lange, Head of Communication von European Plastics „Bioplastics are a logical and necessary step towards better climate protection and a biobased economy. The plastics industry in particular has the potential to reduce carbon dioxide emissions, save fossil resources and promote the use of sustainable raw materials”, says European Bioplastics, the association of the European bioplastics industry, thus contesting the results of a recent US study which according to the association did not reflect the status quo. “The study recommends optimization processes, which are already in use”, suggests European Bioplastics and goes on the offensive. k-online.de talked to European Bioplastics and explains recommendations and conclusions of the study. k-online : The results of a new study “Sustainability of bio-based plastics: general comparative analysis and recommendations for improvement, by Clara-Rosalia Alvarez-Chaves, Sally Edwards, Rafael Moure-Eraso and Kenneth Geiser of the University of Massachusetts were recently published in the Journal of Cleaner Production 23 (2012, 47-56). European Plastics: This study is the first of its kind and goes beyond life cycle thinking and environmental impact analysis. It includes political parameters that are not necessarily scientifically backed up and cannot be seen as societal or academic consensus. k-online: All in all, the study recognises the potential offered by biobased plastics for improving the overall sustainability related to the production and consumption of plastics. The authors acknowledge the benefits of renewability, the potential for energy savings and the additional end of life options offered by a number of biobased polymers. European Plastics: Unfortunately, due to partly obsolete data many recommendations of the paper are outdated, as optimisation processes within the bioplastics industry are well on the way. Important improvements in sourcing strategies of bioplastics companies that took place in recent years as well as advances in production technology leading to lesser use of chemicals, lower water use and less generation of byproducts were not considered by the authors. Furthermore, the study is based on a limited number of examples (bioplastic material types) which results in unbalanced conclusions. k-online: Some specific remarks on the recommendations and conclusions of the study, for example regarding the guiding principles for sustainability European Plastics: The study applies the catalogue of the Sustainable Biomaterials Coalition (SBC), containing 12 guiding principles for measuring sustainability, to bioplastics. This is problematic insofar as these indicators are better suited to assess the sustainability of finished products then that of a class of materials. Recommendations like “reduce single use products” or “design products that are recyclable” are not applicable to materials, they refer to final products. k-online: What about assessment of selected materials? European Plastics: The term “bioplastics” encompasses a wide variety of materials. The study, however, focuses on selected material types (like PLA or biobased PUR). It does not take into account recently developed materials such as biobased Polyethylene (PE) and partly biobased Polyethylene terephtalate (PET) which are highly relevant in the market (see European Bioplastics publications on worldwide bioplastics production capacity 2010-2015, available at www.europeanbioplastics. Editor’s note). k-online: Catchword Genetically modified organism (GMO). European Plastics: The focus on selected materials and the strong emphasis on genetically modified (GMO) crops leads to a skewed perception of bioplastic materials in general. GMO is a specific issue for production facilities in a few regions, e.g. in the U.S. that use certain crops (mainly corn and soy). The switch to GMO crops is not driven by the bioplastics industry, nor is it a prerequisite to produce bioplastics. On the contrary, producers and brand owners commonly seek for possibilities to offer GMO free material or to establish offset programmes. Some producers of biopolymers that source corn from the U.S. offer various options for their customers to either compensate the use of GMO crops or to produce batches from non-GMO crops. In the US, IATP’s (Institute for Agriculture and Trade Policy) developed the Working Landscape Certification (WLC) scheme to grow more crops based on sustainable and non GMO agricultural practices. k-online: What about the toxicity,… European Plastics: Also the production of biobased plastics require energy, chemicals and catalysts and so does not differ from other plastics. The chemical and plastics industry have long-term experience in safely handling production processes and minimising the risks for workers and the environment. Additionally, sufficient regulation to secure the health of users of plastics products, e.g. food contact regulations, are in place. The detailed description of toxicological impacts of process chemicals and catalysts in the study is not correct. k-online: compostability,… European Plastics: The study also links the concepts of biobased materials with the property of biodegradability. This is a frequent misconception. The biodegradability of a plastic material is not dependent onthe source of raw material. 100 percent renewably sourced materials can be completely resistant to biodegradation. Analogously petro-based plastics can be biodegradable. Accordingly, blending of renewable feedstocks with petroleum-based plastics can result in biodegradable or non-biodegradable compounds. For distinguishing both kinds of blends, compostability certification and labelling according to EN 13432, ASTM 6400 or ISO 17088 is a proven tool. Composting is a viable end-of-life option for certain product categories. However, depending on the respective type biobased polymers can be recovered via mechanical recycling and feedstock recovery or incinerated with energy recovery. Establishing use cascades with reuse, recycling and final energetic use secures the efficient utilisation of the renewable feedstock. k-online: technological advances, … European Plastics: The production of biobased plastics is in an early phase and the industry constantly makes substantial technological improvements. The study fails to integrate these developments in it’s assessment of the production of biobased plastics. For example NatureWorks, the world’s leading PLA producer, has employed a more efficient lactic acid fermentation process since that substantially reduces the formation of the lactic acid co-products already in 2008. k-online: and agriculture and bioplastics? European Bioplastics: The obedience to the rules of good agricultural practices is an important prerequisite for fully exploiting the environmental benefit offered by biobased plastics. Currently new schemes are developedassuring the compliance of agricultural raw materials production with sustainability requirements. The International Sustainability and Carbon Certification (ISCC) organization recently launched a new scheme tailored specifically to bioplastics - “ISCC-Plus”. ISCC-plus addresses sustainable feedstock criteria on a farm level, as well as chain of custody and traceability to the point of consumer sale. k-online: Do you see further sources of raw materials for the bioplastics production? European Plastics: Already today certain by-products from food production are used to produce some kinds of bioplastics. This source certainly bears potential for a more intense use. Cellulosic feedstocks are already in use for some kind of materials, e.g. regenerated cellulose, cellulose acetates and lignin based polymers. Intensive research and development is taking place in the field of biorefineries, which will tap into second generation feedstock like straw, corn stover or other cellulosic based sources. Once these are in place, a stream of non food crop based fermentable sugars will become available for energy, chemicals and polymers. This will further reduce potential conflicts in land use for food and feed purposes. k-online: What is the future of biobased plastics? European Plastics: The potential of bioplastics is undisputed. Acknowledging the study’s ambitious target to assess bioplastics and their full and true potential, European Bioplastics is open to the scientific discourse and is offering its expertise and network to create up-to-date insights into our industry as well as future-bound recommendations. k-online: Where do you see the long-term benefit of bioplastics? European Bioplastics: Bioplastics are a logical and necessary step toward climate protection and a biobased economy. Climate protection is no longer a trend, but a necessity, and the plastics industry has to find ways to keep up. Bioplastics are a part of the plastics industry that drives the field forward. They offer a large – but partly not yet usable – potential to reduce carbon dioxide emissions, save fossil resources and promote a sustainable utilization of raw materials (renewability). k-online: Do you believe that biobased plastics will manage to assert themselves against conventional plastics made from fossil raw material sources in the foreseeable future? European Bioplastics: Due to the scope (1 million tons bioplastics per year – 2011; 250 million tons plastics in general) the substitution of plastics with bioplastics is – although technically possible – not realistic in a short period of time. However, with a yearly increase of approximately 20%, bioplastics will continue to conquer various market segments. Questions, for example regarding waste management or the product optimization of specific applications, will be solved with the advancing developments. k-online: Thank you for the interview. k-online talked to Kristy-Barbara Lange, Head of Communication at European Bioplastics. Further information about the association and its mission are available at www.european-bioplastics.org . Link to the criticized study: Clara Rosalía Álvarez-Cháveza, Rafael Moure-Erasoa, and Kenneth Geisera. Sustainability of bio-based plastics: general comparative analysis and recommendations for improvement. Journal of Cleaner Production, 23 (2012) 47-56.

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