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Microstructure and mechanism study of polylactide obtained by the copolymerization of L-lactide and D,L-lactide

✍ Scribed by Peng Zhao; Qin-Feng Wang; Qian Zhong; Nai-Wen Zhang; Jie Ren

Book ID: 101599450
Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 234 KB
Volume: 115
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.31387

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✦ Synopsis

Abstract

The stereosequence of polylactide has been analyzed with ^13^C‐NMR spectroscopy, according to which syndiotactic addition is preferred. According to Markovian statistics, the reactivity ratio, which determines the extent of the syndiotactic stereosequence in the polymer chain, can be calculated by an analysis of the carbonyl and methine regions in the spectra. Moreover, the average lengths of segments SS and RR can be proposed and calculated with the distributing function of the sequence. On this basis, we have investigated the formation mechanism with respect to the preference for the syndiotactic addition of polylactide chains. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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