From: Andy Soos, ENN
Published September 30, 2011 01:31 PM

A Better Plastic

Researchers at the University of Leeds and Durham University have solved a long-standing problem that could revolutionize the way new plastics are developed. The breakthrough will allow experts to create the perfect plastic with specific uses and properties by using a high-tech 'recipe book'. It will also increase our ability to recycle plastics. The research is published in the journal Science.

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A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce production costs. Monomers of plastic are either natural or synthetic organic compounds.

The paper's authors form part of the Microscale Polymer Processing project, a collaboration between academics and industry experts which has spent 10 years exploring how to better build giant macromolecules. These long tangled molecules are the basic components of plastics and dictate their properties during the melting, flowing and forming processes in plastics production.

Low-density polyethylenes (LDPEs) are used in trays and containers, lightweight car parts, recyclable packaging and electrical goods. Up until now, industry developed a plastic then found a use for it, or tried hundreds of different recipes to see which worked. This method could save the manufacturing industry time, energy and money.

The mathematical models used put together two pieces of computer code. The first predicts how polymers will flow based on the connections between the string-like molecules they are made from. A second piece of code predicts the shapes that these molecules will take when they are created at a chemical level. These models were enhanced by experiments on carefully synthesized perfect polymers created in labs of the Microscale Polymer Processing project.

Dr Daniel Read, from the School of Mathematics, University of Leeds, who led the research, said: "Plastics are used by everybody, every day, but until now their production has been effectively guesswork. This breakthrough means that new plastics can be created more efficiently and with a specific use in mind, with benefits to industry and the environment."

Professor McLeish added that as plastics production moves from oil-based materials to sustainable and renewable materials, the trial and error phase in developing new plastics could now be by-passed. He said: "By changing two or three numbers in the computer code, we can adapt all the predictions for new bio-polymer sources."

Dr. Ian Robinson of Lucite International, one of the industrial participants in the wider project said: "The insights offered by this approach are comparable to cracking a plastics DNA."

For further information: http://www.leeds.ac.uk/forstaff/news/article/2488/scientists_and_engineers_create_the_perfect_plastic

Photo: http://www.reuseit.com/learn-more/materials/plastics-an-overview

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