Citation: Jian Hu, Li-Li Han, Tong-Ping Zhang, Yong-Xin Duan, Jian-Ming Zhang. Study on Phase Transformation Behavior of Strain-induced PLLA Mesophase by Polarized Infrared Spectroscopy[J]. Chinese Journal of Polymer Science, ;2019, 37(3): 253-257. doi: 10.1007/s10118-019-2184-5 shu

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

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

Corresponding author: Jian-Ming Zhang, zjm@qust.edu.cn
Received Date: 19 July 2018
Revised Date: 22 August 2018
Accepted Date: 28 August 2018
Available Online: 25 September 2018

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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