Mesophase Formation and Structure Evolution of Poly(lactic acid) During Annealing

doi:10.7503/cjcu20150788

Chem. J. Chinese Universities ›› 2016, Vol. 37 ›› Issue (3): 581.doi: 10.7503/cjcu20150788

• Polymer Chemistry • Previous Articles Next Articles

Mesophase Formation and Structure Evolution of Poly(lactic acid) During Annealing

ZHANG Yanyan², ZHUO Ranran³, LI Guili¹, SHAO Chunguang¹, LI Qian¹, XU Xianzhong², WANG Yaming¹, CAO Wei¹, LIU Chuntai¹, SHEN Changyu¹

1. National Engineering Research Center for Advanced Polymer Processing Technology, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, China;
2. School of Mechanics and Engineering Science, Zhengzhou University, Zhengzhou 450001, China;
3. Physical Engineering College, Zhengzhou University, Zhengzhou 450001, China

Received:2015-10-15 Revised:2016-01-24 Online:2016-03-10 Published:2016-01-24
Supported by:
Supported by the National Natural Science Foundation of China(No.51573171) and the Key Project of National Natural Science Foundation of China(No.11432003).

Abstract

Abstract:

Poly(lactic acid)(PLA) film were prepared by quenching, and the structure evolution of amorphous PLA film was researched online by in situ Fourier transform infrared spectrophotometer(FTIR) analysis based on different annealing temperatures. The results showed that there was a critical crystallization temperature. The cold crystallization of sample could be realized through partial adjustment of the molecular chain when the annealing temperature was above the critical value, conversely, none of cold crystallization could happen. Besides, it was found that mesophase always first appeared in the cold crystallization process, followed by a mesophase-to-crystal phase transformation, while the transition from amorphous to mesophase took place through the synchronous adjustment of the molecular intrachain conformation and interchain packing. The higher the annealing temperature increased, the earlier the mesophase emerged, and the resulting crystal structure would become more and more regular.

Key words: Poly(lactic acid), Annealing, Mesophase, Structure evolution

CLC Number:

O631

TrendMD:

ZHANG Yanyan, ZHUO Ranran, LI Guili, SHAO Chunguang, LI Qian, XU Xianzhong, WANG Yaming, CAO Wei, LIU Chuntai, SHEN Changyu. Mesophase Formation and Structure Evolution of Poly(lactic acid) During Annealing[J]. Chem. J. Chinese Universities, 2016, 37(3): 581.

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Mesophase Formation and Structure Evolution of Poly(lactic acid) During Annealing

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