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Biodegradable plastics go to compost heaps, not landfills

ITHACA, N.Y. -- Instead of landfills clogged with computer and car parts, packaging and a myriad of other plastic parts, a Cornell University fiber scientist has a better idea. In coming years, he says, many of these discarded items will be composted.

The key to this "green" solution, says researcher Anil Netravali, is fully biodegradable composites made from soybean protein and other biodegradable plastics and plant-based fibers, developed at Cornell and elsewhere.

"These new fully biodegradable, environment-friendly green composites have good properties and could replace plastic parts in the interiors of cars and trains, in computers and in packaging materials and other consumer products," says Netravali, a professor of fiber science in the College of Human Ecology at Cornell. "They also provide excellent insulation against heat and noise for use in applications such as cars. Although the plant-based fibers may not be as strong as graphite and Kevlar, for example, they are low in cost, biodegradable and replenishable on a yearly basis," he says.

Netravali's findings are published in the September issue of the Journal of Materials Science .

He presented his research on green composites made from ramie fibers (which have a feel similar to silk) at the International Conference on Composites Engineering in Denver two years ago and in San Diego this summer. Ramie fibers are obtained from the stem of an Asian perennial shrub and the resin made from a soy protein isolate-polymer. He did this work in collaboration with Preeti Lodha, a graduate student who received her master's degree from Cornell in 2000, and Sunghyun Nam, who completed her master's in fiber science earlier this year.

Instead of nondegradable plastics based on petroleum products, green composites (also known as reinforced plastics) use natural fibers that, for strength, are embedded in a matrix made of a plant-based or other resin. Netravali points out that composites t
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Contact: Susan S. Lang
SSL4@cornell.edu
607-255-3613
Cornell University News Service
9-Sep-2002


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