By M. Johnson, L.Y. Mwaikambo, N. Tucker

The earth has finite assets by way of fossil foundation gasoline and a finite potential for disposal of waste. Biopolymers may possibly provide an answer to either those concerns within the long term. This Rapra evaluation document units out to ascertain the present developments in biopolymer technological know-how. the different sorts of organic polymers are mentioned, and the chemistry and synthesis of a few key biopolymers are defined. This overview is observed by way of over four hundred abstracts from papers and books within the Rapra Polymer Library database, to facilitate extra studying in this topic.

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876682 Item 8 ANTEC 2002. , 5th-9th May 2002. , SPE, 2002, Paper 440, Session T41Composites. 5, CD-ROM, 012 28 NEW FUNCTIONAL BIOPOLYMER NATURAL FIBER COMPOSITES FROM AGRICULTURAL RESOURCES Lanzillotta C; Pipino A; Lips D Fiat Research Center; Zurich,Eidgenossische Technische Hochschule (SPE) Using poly(lactic acid) or a starch derivative as the matrix and flax as the fibre reinforcement, biodegradable composites were prepared and evaluated for the production of automotive components. The materials were successfully injection moulded, but fibre input to the compounding extruder presented problems.

The foam density was reduced and expansion increased significantly by addition of either resin. At constant relative humidity, compressive strength was a function of foam density only and not the type of resin or starch in the blend. The water sensitivity of the foams was reduced by addition of the resins and the time needed for complete dissolution was increased. Blends with PLA, PHEE, or PHBV produced foams with densities comparable to commercial starch-based loose-fill foams. 42 refs. 8 COMPOSTABLE COMPOSITES A researcher in Cornell University in the USA has developed environmentally friendly biodegradable composites made from soybean protein reinforced with plant-based fibres, such as ramie fibres.

4 and at 37C for 18 weeks. The degradation and mechanical properties of PEA were also followed in a self-reinforced(SR) composite structure consisting of PEA and sol-gel derived silica fibres (8 wt %). The hydrolytic degradation of the SR-PEA-rods with and without the sol-gel silica fibres was significantly faster than that of SR-PLLA-rods. (Mw) of PEA decreased by 90% from the initial 33 References and Abstracts Mw during the first six weeks in hydrolysis, while the Mw of the PLLA decreased by 10%.

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Biopolymers by M. Johnson, L.Y. Mwaikambo, N. Tucker
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