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Epoxidation of bacterial polyesters with unsaturated side chains. II. Rate of epoxidation and polymer properties

✍ Scribed by Won Ho Park; Robert W. Lenz; Steve Goodwin

Publisher: John Wiley and Sons
Year: 1998
Tongue: English
Weight: 154 KB
Volume: 36
Category: Article
ISSN: 0887-624X
DOI: 10.1002/(sici)1099-0518(19980930)36:13<2381::aid-pola25>3.0.co;2-5

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✦ Synopsis

Poly(3-hydroxyoctanoate-co-3-hydroxy-10-undecenoate)s (PHOUs) with controlled amounts of unsaturated repeating units were epoxidized to various extents with m-chloroperbenzoic acid (MCPBA) in homogeneous solution. The epoxidation reaction was second order, with an initial rate constant of 1.1 ϫ 10 Ϫ3 Lmol Ϫ1. s Ϫ1 at 20°C, regardless of the unsaturated unit content in PHOU. No substantial change in either molecular weight or molecular weight distribution occurred as a result of epoxidation, but the melt transition temperature and enthalpy of melting both decreased as the unsaturated groups were increasingly converted into epoxide groups. In contrast, the glass transition temperature (T g ) increased by approximately 0.25 °C for each 1 mol % of epoxidation, irrespective of the composition of the PHOU.

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