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

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Abstract

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.

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Acknowledgments

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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Authors and Affiliations

  1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science & Technology, Qingdao, 266042, China

    Jian Hu, Li-Li Han, Tong-Ping Zhang, Yong-Xin Duan & Jian-Ming Zhang

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  1. Jian Hu
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  2. Li-Li Han
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Correspondence to Jian-Ming Zhang.

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Hu, J., Han, LL., Zhang, TP. et al. Study on Phase Transformation Behavior of Strain-induced PLLA Mesophase by Polarized Infrared Spectroscopy. Chin J Polym Sci 37, 253–257 (2019). https://doi.org/10.1007/s10118-019-2184-5

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