高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (4): 971.

• 研究论文 • 上一篇    下一篇

拉伸对聚左旋乳酸结晶的影响

邢倩1,2, 张秀芹1, 罗发亮1,2,3, 刘国明1,2, 王笃金1   

  1. 1. 中国科学院化学研究所, 工程塑料重点实验室, 北京分子科学国家实验室, 北京 100190;
    2. 中国科学院研究生院, 北京 100049;
    3. 宁夏大学宁夏能源化工自治区重点实验室, 银川 750021
  • 收稿日期:2010-05-10 修回日期:2010-07-26 出版日期:2011-04-10 发布日期:2011-03-09
  • 通讯作者: 王笃金 E-mail:djwang@iccas.ac.cn
  • 基金资助:

    国家自然科学基金(批准号： 50925313, 50873112)资助.

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

XING Qian1,2, ZHANG Xiu-Qin1, LUO Fa-Liang1,2,3, LIU Guo-Ming1,2, WANG Du-Jin1*   

  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.

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被引次数

33

摘要： 在成型加工过程中，拉伸是提高聚合物材料结晶能力的一种重要手段. 本文采用红外光谱、差示扫描量热分析、X射线衍射等方法系统研究了不同温度下拉伸对聚左旋乳酸（PLLA）结晶行为的影响. 结果表明，在合适的温度条件下，拉伸能迅速提高PLLA的结晶速度和结晶度. 对经过拉伸预处理但未结晶的PLLA样品进行等温及非等温结晶的研究发现，经过拉伸预处理的PLLA样品的结晶速率和结晶度都得到提高，这表明预拉伸会影响PLLA在后续过程中的结晶行为.

关键词: 聚左旋乳酸, 拉伸, 结晶

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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