Journal
THERMOCHIMICA ACTA
Volume 473, Issue 1-2, Pages 19-24Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tca.2008.04.001
Keywords
polymerization; halogenocarboxylates; metal halides; thermochemical reactivity; polyesters
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The thermochemical behaviour of metal salts (M = Na, Rb, Cs, Ag) of 3-chloro- and 3-bromobutyric acid was studied with respect to the elimination of a metal halide and the formation of poly(3-hydroxybutyrate), P-3HB, a biodegradable polyester. Two possible reaction pathways for this elimination reaction were found. The polycondensation to P-3HB was favoured at lower temperature whereas the formation of volatile crotonic acid and isocrotonic acid was favoured at higher temperature. In the case of silver 3-chlorobutyrate where AgCl was eliminated and P-3HB was the major product. All other combinations of metals and halogen gave only small amounts of polymer. (C) 2008 Elsevier B.V. All rights reserved.
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