Chinese Journal of Polymer Science

, Volume 37, Issue 3, pp 253–257 | Cite as

Study on Phase Transformation Behavior of Strain-induced PLLA Mesophase by Polarized Infrared Spectroscopy

  • Jian Hu
  • Li-Li Han
  • Tong-Ping Zhang
  • Yong-Xin Duan
  • Jian-Ming ZhangEmail author


The structural transformation of mesophase to crystalline phase of strain-induced poly(L-lactic acid) has been investigated by differential scanning calorimetry (DSC) and in situ temperature dependent polarized Fourier transform infrared (FTIR) spectroscopy. It is found that, as the drawing temperature increases, melting of strain-induced mesophase in the heating process can remarkably interfere the crystallization behavior subsequently. Coupling with in situ polarized FTIR, from 60 °C to 76 °C, the mesophase melts partially rather than completely melting, and changes immediately to three-dimensional ordered structure. Of particular note, through monitoring the subtle spectral change in the critical phase transformation temperature from 60 °C to 64 °C, it is clearly demonstrated that relaxation of oriented amorphous chains initially takes place prior to the melting of mesophase.


Structural transformation Mesophase Strain-induced Polarized IR spectroscopy 


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The financial supports from the National Natural Science Foundation of China (Nos. 21774068 and 21704053), and Natural Science Foundation of Shandong Province (No. ZR2017BB069) are greatly appreciated.


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Copyright information

© Chinese Chemical Society, Institute of Chemistry (CAS) and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Jian Hu
    • 1
  • Li-Li Han
    • 1
  • Tong-Ping Zhang
    • 1
  • Yong-Xin Duan
    • 1
  • Jian-Ming Zhang
    • 1
    Email author
  1. 1.Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science & TechnologyQingdaoChina

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