Kevlar-like Plastic from Pineapples and Bananas

  • Author: ChemistryViews
  • Published: 29 March 2011
  • Copyright: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  • Source / Publisher: ACS Meeting
thumbnail image: Kevlar-like Plastic from Pineapples and Bananas

Scientists around Alcides Leão, Sao Paulo State University, Sao Paulo, Brazil, have developed a more effective way to use fibers from pineapples, bananas, and other plants in a new generation of automotive plastics. These nano-cellulose fibers are almost as stiff as Kevlar, but are completely renewable. They are 30 % lighter and 3-to-4 times stronger than plastics now in use.

To prepare the nano-fibers, the scientists insert the leaves and stems of pineapples or other plants into a device similar to a pressure cooker. They then add certain chemicals and heat the mixture over several cycles, producing a fine material that resembles talcum powder. The process is costly, but according to the scientists it takes just one pound of nano-cellulose to produce 100 pounds of super-strong, lightweight plastic.

The plastics could lead to stronger, lighter, and more sustainable materials replacing automotive plastics. Similar plastics also show promise for future use in medical applications, such as replacement materials for artificial heart valves, artificial ligaments, and hip joints.

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