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

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• 作者：Yaoqi Shi ; Dongkang Hu ; Zhong Xin ; Shicheng Zhao…
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：51
• 期：10
• 页码：4880-4887
• 全文大小：1,412 KB
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• 作者单位：Yaoqi Shi (1)
  Dongkang Hu (1)
  Zhong Xin (2)
  Shicheng Zhao (1)
  Shuai Zhou (1)
  Xing Meng (1)
  
  1. Shanghai Key Laboratory of Multiphase Material Chemical Engineering, College of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China
  2. State-Key Laboratory of Chemical Engineering, College of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803

文摘

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 °C. The result showed that the PLLA formed α-crystal during the isothermal crystallization at 140 °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 α-crystal with the distorted 10₃ helix conformation.