Influence of Stretching on Crystallization Behavior of Poly(L-lactic acid)

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (4): 971.

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Influence of Stretching on Crystallization Behavior of Poly(L-lactic acid)

XING Qian^1,2, ZHANG Xiu-Qin¹, LUO Fa-Liang^1,2,3, LIU Guo-Ming^1,2, WANG Du-Jin^1*

1. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate School of Chinese Academy of Sciences, Beijing 100049, China;
3. Key Laboratory of Energy & Resource in Ningxia, Ningxia University, Yinchuan 750021, China

Received:2010-05-10 Revised:2010-07-26 Online:2011-04-10 Published:2011-03-09
Contact: WANG Du-Jin E-mail:djwang@iccas.ac.cn
Supported by:
国家自然科学基金(批准号： 50925313, 50873112)资助.

Abstract

Abstract: The crystallization ability of poly(L-lactic acid) (PLLA) is greatly improved by stretching at high temperature. The influence of stretching under different temperatures on the crystallization behavior of PLLA has been investigated by the combinational investigation of FTIR, DSC, and XRD. It was found that stretching can remarkably improve the crystallization rate and crystallinity of PLLA films. Stretched at a draw ratio of 3, PLLA forms α-form crystals rapidly in the range of 90-95 oC. Further improving the draw ratio, the crystallinity remains almost constant. With increasing the stretching temperature up to 105 oC, the PLLA films cannot crystallize under stretching. Contrary to the unstretched PLLA film, the stretched PLLA films gradually crystallize during the heating process, indicating that pre-stretching can change the crystallization behavior of PLLA.

Key words: PLLA, Stretching, Crystallization

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XING Qian, ZHANG Xiu-Qin, LUO Fa-Liang, LIU Guo-Ming, WANG Du-Jin*. Influence of Stretching on Crystallization Behavior of Poly(L-lactic acid)[J]. Chem. J. Chinese Universities, 2011, 32(4): 971.

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Influence of Stretching on Crystallization Behavior of Poly(L-lactic acid)

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