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Journal of Materials Science

, Volume 51, Issue 10, pp 4880–4887 | Cite as

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

  • Yaoqi Shi
  • Dongkang Hu
  • Zhong XinEmail author
  • Shicheng Zhao
  • Shuai Zhou
  • Xing Meng
Original Paper

Abstract

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.

Keywords

PLLA Isothermal Crystallization Interchain Interaction Neat PLLA PLLA Film 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

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.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Yaoqi Shi
    • 1
  • Dongkang Hu
    • 1
  • Zhong Xin
    • 2
    Email author
  • Shicheng Zhao
    • 1
  • Shuai Zhou
    • 1
  • Xing Meng
    • 1
  1. 1.Shanghai Key Laboratory of Multiphase Material Chemical Engineering, College of Chemical EngineeringEast China University of Science and TechnologyShanghaiChina
  2. 2.State-Key Laboratory of Chemical Engineering, College of Chemical EngineeringEast China University of Science and TechnologyShanghaiChina

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