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

The stereosequence of polylactide has been analyzed with ¹³C-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...

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Bibliographic Details
Published in:Journal of applied polymer science 2010-03, Vol.115 (5), p.2955-2961
Main Authors: Zhao, Peng, Wang, Qin-Feng, Zhong, Qian, Zhang, Nai-Wen, Ren, Jie
Format: Article
Language:English
Subjects:
biopolymers
Copolymerization
Distributing
Mathematical analysis
microstructure
Polylactides
Reproduction
Segments
Spectra
Statistics
Syndiotacticity
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Summary:The stereosequence of polylactide has been analyzed with ¹³C-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.
ISSN:0021-8995
1097-4628
1097-4628
DOI:10.1002/app.31387