By M. Johnson, L.Y. Mwaikambo, N. Tucker
The earth has finite assets by way of fossil beginning gas and a finite means for disposal of waste. Biopolymers could supply an answer to either those matters within the long term. This Rapra evaluate file units out to check the present tendencies in biopolymer technological know-how. the differing kinds of organic polymers are mentioned, and the chemistry and synthesis of a few key biopolymers are defined. This evaluate is followed through over four hundred abstracts from papers and books within the Rapra Polymer Library database, to facilitate additional studying in this topic.
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Additional info for Biopolymers
It was observed with both synthetic and vegetable oil based polyols that lower water contents gave a more uniform cell structure, and higher water contents gave an increase in hard domain size. An increase in the amount of synthetic polyols in the blend gave increased reaction rates due to an increase of primary hydroxyl groups. 18 refs. 1587-9 STRUCTURE AND MECHANICAL PROPERTIES OF POLY(3-HYDROXYBUTYRATE-CO-3HYDROXYVALERATE ) (PHVP)/CLAY NANOCOMPOSITES Chen G X; Hao G J; Guo T Y; Song M D; Zhang B H Tianjin,Nankai University Polyhyroxyalkanoates, PHA, comprise a family of biopolymers that has attracted attention recently due to their biodegradability, biocompatibility and natural origin.
32 refs. 479-84 © Copyright 2003 Rapra Technology Limited POLYHYDROXYALKANOATES(PHAS): SUSTAINABLE BIOPOLYESTER PRODUCTION Braunegg G; Bona R; Schellauf F; Wallner E Graz,Technische Universitat Topics discussed include PHA metabolism and PHAproducing microorganisms, carbon sources for PHA production, PHA production kinetics and its influence on process design, and downstream processing for PHA isolation. 23 refs. 63-84 A LITERATURE REVIEW OF POLY(LACTIC ACID) Garlotta D US,National Center for Agricultural Utilization Research A review is presented on the synthesis, physicochemical properties, chemistry and mechanical properties of polylactic acid from the 1950s to 1990s.
Compared with the control starch, foams of corn starch with poly(lactic acid) (PLA), poly(hydroxyester ether) (PHEE), or poly(hydroxybutyrate-co-valerate) (PHBV) had significantly lower densities and greater radial expansion ratios. Blends with other polyesters and CA had densities and expansion ratios between those of the control starch and the other polyesters. Although PLA domains were much smaller, most of the polymer occupied spherical to elongated domains 1-10 microns long. Surface polymer concentrations were larger than the bulk and correlated with foam expansion and resistance to fragmentation.