Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid)

›› 2010, Vol. 18 ›› Issue (6): 899-904.

Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid)

温亮, 辛忠

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

收稿日期:2010-06-13 修回日期:2010-09-04 出版日期:2010-12-28 发布日期:2010-12-28
通讯作者: XIN Zhong, E-mail: xzh@ecust.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (20876042);Program of Shanghai Subject Chief Scientist (10XD1401500);Research Fund for the Doctoral Program of Higher Education of China

Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid)

WEN Liang, XIN Zhong

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received:2010-06-13 Revised:2010-09-04 Online:2010-12-28 Published:2010-12-28
Supported by:
Supported by the National Natural Science Foundation of China (20876042);Program of Shanghai Subject Chief Scientist (10XD1401500);Research Fund for the Doctoral Program of Higher Education of China

摘要/Abstract

摘要： The effect of a novel active nucleating agent(TBC8-eb) on the isothermal crystallization of poly(L-lactic acid) (PLLA) was studied by differential scanning calorimetry(DSC) and Fourier transform infrared spectroscopy(FTIR). The analysis on kinetics demonstrates that TBC8-eb can not only accelerate the crystallization rate but also transform most of the original spherulite crystals of PLLA into sheaf-like crystals. Furthermore,the free energy of folding(σ_e) of PLLA and PLLA with TBC8-eb is 0.15 and 0.06 J·m^-2,respectively,which suggests that the addition of TBC8-eb favors the regular folding of molecule chains in the crystallization of PLLA,improv-ing its crystallization rate. The FTIR results show that TBC8-eb can accelerate the conformational ordering of PLLA in the isothermal crystallization. The conformational ordering of PLLA nucleated with TBC8-eb begins with the interchain interaction of —CH₃,and then a short helix emerges where a couple of —CH₃ groups interact.

关键词: crystallization, poly(L-lactic acid), nucleating agent

Abstract: The effect of a novel active nucleating agent(TBC8-eb) on the isothermal crystallization of poly(L-lactic acid) (PLLA) was studied by differential scanning calorimetry(DSC) and Fourier transform infrared spectroscopy(FTIR). The analysis on kinetics demonstrates that TBC8-eb can not only accelerate the crystallization rate but also transform most of the original spherulite crystals of PLLA into sheaf-like crystals. Furthermore,the free energy of folding(σ_e) of PLLA and PLLA with TBC8-eb is 0.15 and 0.06 J·m^-2,respectively,which suggests that the addition of TBC8-eb favors the regular folding of molecule chains in the crystallization of PLLA,improv-ing its crystallization rate. The FTIR results show that TBC8-eb can accelerate the conformational ordering of PLLA in the isothermal crystallization. The conformational ordering of PLLA nucleated with TBC8-eb begins with the interchain interaction of —CH₃,and then a short helix emerges where a couple of —CH₃ groups interact.

Key words: crystallization, poly(L-lactic acid), nucleating agent

温亮, 辛忠. Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid)[J]. , 2010, 18(6): 899-904.

WEN Liang, XIN Zhong. Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid)[J]. , 2010, 18(6): 899-904.

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Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid)

Effect of a Novel Nucleating Agent on Isothermal Crystallization of Poly(L-lactic acid)

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