Get access

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

Authors

  • Peng Zhao,

    1. Institute for Advanced Materials and Nano Biomedicine, Tongji University, Shanghai, People's Republic of China 200092
    2. Department of Chemistry, Tongji University, Shanghai, People's Republic of China 200092
    Search for more papers by this author
  • Qin-Feng Wang,

    1. Institute of Nano and Bio-Polymeric Materials, Tongji University, Shanghai, People's Republic of China 200092
    Search for more papers by this author
  • Qian Zhong,

    1. Institute of Nano and Bio-Polymeric Materials, Tongji University, Shanghai, People's Republic of China 200092
    Search for more papers by this author
  • Nai-Wen Zhang,

    1. Institute of Nano and Bio-Polymeric Materials, Tongji University, Shanghai, People's Republic of China 200092
    Search for more papers by this author
  • Jie Ren

    Corresponding author
    1. Institute for Advanced Materials and Nano Biomedicine, Tongji University, Shanghai, People's Republic of China 200092
    2. Institute of Nano and Bio-Polymeric Materials, Tongji University, Shanghai, People's Republic of China 200092
    • Institute for Advanced Materials and Nano Biomedicine, Tongji University, Shanghai, People's Republic of China 200092
    Search for more papers by this author

Abstract

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. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

Ancillary