Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Biodegradable reinforced plastics could replace landfills with compost heaps, Cornell fiber scientist believes

10.09.2002


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 technology is not new -- he cites primitive bricks and walls made of straw mixed with mud as examples.

Netravali notes that most nondegradable plastic composites, made from petroleum-based or synthetic polyurethane, polyethylene and polypropylene, end up in landfills. Not much can be reused or recycled. Plant-based green composites, however, could, he says, become inexpensive alternatives for many mass-produced items. "They will be made from yearly renewable agricultural sources and would be environmentally friendly because they would naturally biodegrade once they were thrown on a compost pile."

Netravali’s research group is working with a number of fibers, including those obtained from kenaf stems, pineapple and henequen leaves and banana stems. The resin materials he is researching include commercial resins, such as polyvinyl alcohol and polylactones, and those derived from microorganisms. He currently is manipulating the composites to improve their mechanical properties, such as stiffness and strength, and to decrease their water absorption, which could start premature degradation.

The new composites could also substitute for wood in such applications as crates or building studs. "Trees take 25 years to grow; fibers we use, however, come from plants that grow to maturity in a year," Netravali points out.

Netravali agrees that green composites are likely to be more expensive than nonbiodegradable plastics, but as they gain acceptance and the volume increases, they will become less expensive, he says. For example, graphite fibers, commonly used as a reinforcement in space applications, cost over $180 a pound when first developed. Today they are less than $10 a pound.

Susan S. Lang | EurekAlert!
Further information:
http://www.news.cornell.edu/releases/Sept02/green.plastics.ssl.html

More articles from Ecology, The Environment and Conservation:

nachricht Emissions from road construction could be halved using today’s technology
18.05.2020 | Schwedischer Forschungsrat - The Swedish Research Council

nachricht When every particle counts: IOW develops comprehensive guidelines for microplastic extraction from environmental samples
11.05.2020 | Leibniz-Institut für Ostseeforschung Warnemünde

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Biotechnology: Triggered by light, a novel way to switch on an enzyme

In living cells, enzymes drive biochemical metabolic processes enabling reactions to take place efficiently. It is this very ability which allows them to be used as catalysts in biotechnology, for example to create chemical products such as pharmaceutics. Researchers now identified an enzyme that, when illuminated with blue light, becomes catalytically active and initiates a reaction that was previously unknown in enzymatics. The study was published in "Nature Communications".

Enzymes: they are the central drivers for biochemical metabolic processes in every living cell, enabling reactions to take place efficiently. It is this very...

Im Focus: New double-contrast technique picks up small tumors on MRI

Early detection of tumors is extremely important in treating cancer. A new technique developed by researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from normal tissue. The work is published May 25 in the journal Nature Nanotechnology.

researchers at the University of California, Davis offers a significant advance in using magnetic resonance imaging to pick out even very small tumors from...

Im Focus: I-call - When microimplants communicate with each other / Innovation driver digitization - "Smart Health“

Microelectronics as a key technology enables numerous innovations in the field of intelligent medical technology. The Fraunhofer Institute for Biomedical Engineering IBMT coordinates the BMBF cooperative project "I-call" realizing the first electronic system for ultrasound-based, safe and interference-resistant data transmission between implants in the human body.

When microelectronic systems are used for medical applications, they have to meet high requirements in terms of biocompatibility, reliability, energy...

Im Focus: When predictions of theoretical chemists become reality

Thomas Heine, Professor of Theoretical Chemistry at TU Dresden, together with his team, first predicted a topological 2D polymer in 2019. Only one year later, an international team led by Italian researchers was able to synthesize these materials and experimentally prove their topological properties. For the renowned journal Nature Materials, this was the occasion to invite Thomas Heine to a News and Views article, which was published this week. Under the title "Making 2D Topological Polymers a reality" Prof. Heine describes how his theory became a reality.

Ultrathin materials are extremely interesting as building blocks for next generation nano electronic devices, as it is much easier to make circuits and other...

Im Focus: Rolling into the deep

Scientists took a leukocyte as the blueprint and developed a microrobot that has the size, shape and moving capabilities of a white blood cell. Simulating a blood vessel in a laboratory setting, they succeeded in magnetically navigating the ball-shaped microroller through this dynamic and dense environment. The drug-delivery vehicle withstood the simulated blood flow, pushing the developments in targeted drug delivery a step further: inside the body, there is no better access route to all tissues and organs than the circulatory system. A robot that could actually travel through this finely woven web would revolutionize the minimally-invasive treatment of illnesses.

A team of scientists from the Max Planck Institute for Intelligent Systems (MPI-IS) in Stuttgart invented a tiny microrobot that resembles a white blood cell...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Dresden Nexus Conference 2020: Same Time, Virtual Format, Registration Opened

19.05.2020 | Event News

Aachen Machine Tool Colloquium AWK'21 will take place on June 10 and 11, 2021

07.04.2020 | Event News

International Coral Reef Symposium in Bremen Postponed by a Year

06.04.2020 | Event News

 
Latest News

Black nitrogen: Bayreuth researchers discover new high-pressure material and solve a puzzle of the periodic table

29.05.2020 | Materials Sciences

Argonne researchers create active material out of microscopic spinning particles

29.05.2020 | Materials Sciences

Smart windows that self-illuminate on rainy days

29.05.2020 | Power and Electrical Engineering

VideoLinks
Science & Research
Overview of more VideoLinks >>>