文献类型：期刊文献

英文题名：Conformation order of poly(L-lactic acid) chains during the melt crystallization process: infrared and two-dimensional infrared correlation spectroscopy study

作者：Shi, Yaoqi[1];Hu, Dongkang[1];Xin, Zhong[2];Zhao, Shicheng[1];Zhou, Shuai[1];Meng, Xing[1]

机构：[1]E China Univ Sci & Technol, Coll Chem Engn, Shanghai Key Lab Multiphase Mat Chem Engn, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Coll Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2016

卷号：51

期号：10

起止页码：4880

外文期刊名：JOURNAL OF MATERIALS SCIENCE

收录：;EI(收录号：20160701915138);WOS:【SCI-EXPANDED(收录号:WOS:000372573000015)】；

基金：The authors thank the National Natural Science Funds of China (21306047, 21476085, 21576086), the Fundamental Research Funds for the central universities of China for financial support.

语种：英文

外文关键词：Isotherms - Lactic acid - Chains

摘要：Chain conformation order of poly (L-lactic acid) (PLLA) was investigated by time-lapsed Fourier transform infrared (FTIR) spectroscopy and two-dimensional infrared correlation spectroscopy during the isothermal crystallization at 140 degrees C. The result showed that the PLLA formed a-crystal during the isothermal crystallization at 140 degrees C. According to the detailed information in the region of 1000-1500 cm(-1) investigated by infrared and 2D correlation spectroscopy, it was found that the conformation of C-O-C groups changed prior to that of CH3 groups. Moreover, the formation of the initial helix chain conformation was interfered by the interchain interactions between the CH3 groups, which consequently resulted in the formation of alpha-crystal with the distorted 10(3) helix conformation.