成核剂对生物降解聚乳酸结晶行为的影响

石油化工高等学校学报 ›› 2008, Vol. 21 ›› Issue (2): 10-14.

成核剂对生物降解聚乳酸结晶行为的影响

沈兆宏, 钱欣, 钱仕杰

(浙江工业大学化学工程与材料学院,浙江杭州310014)

收稿日期:2007-08-31 出版日期:2008-06-20 发布日期:2017-06-28
作者简介:沈兆宏(1982-),男,浙江湖州市,在读硕士
基金资助:
浙江省自然科学基金资助项目(M503017)

Effect of Nucleating Agents on the Crystallization of Poly(lactide) 

SHEN Zhao-hong, QIAN Xin, QIAN Shi-jie

(College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou Zhejiang 310014,P.R.China)

Received:2007-08-31 Published:2008-06-20 Online:2017-06-28

摘要/Abstract

摘要： 采用DSC和POM 对聚乳酸及聚乳酸/成核剂体系的结晶行为进行了研究。结果表明,一定温度范围下,等温结晶后的各样品在熔融时,均出现两个熔融峰。含滑石粉的样品出现两个熔融峰所需温度要比其它样品所需温度约低10℃。3种成核剂都有利于提高聚乳酸的结晶速度和结晶度,其中滑石粉的效果最显著。在125 ℃时滑石粉的加入使得t1/2从7.78min缩短到3.33min,tmax从7.84min缩短到3.18min;相同保温时间时(130 ℃,10min),结晶度约提高了19%。而成核剂对改变聚乳酸等温结晶过程的成核机理和生长方式无明显影响。

关键词: 聚乳酸, 成核剂, 等温结晶, 结晶动力学

Abstract:

Differential scanning calorimetry and polarizing optical microscope were used to characterize the melting behavior and isothermal crystallization kinetics of pure poly(lactide) and blends of PLA with nucleating agents at varying isothermal crystallization temperatures. Two small crystallization exothermic peak were observed prior to the major melting endothermic peak in the heating scans. This phenomenon occurred lower 10 ℃ in PLA/Talc blends. All nucleating agents increased the crystallization rate of PLA, but Talc was the most effective one. With Talc, at 125 ℃, t_1/2 from 7.78 min to 3.33 min, tmax from 7.84 min to 3.18 min; at 130 ℃,10 min,degree of crystallinity improved 19%.The nucleation mechanism and geometry of crystal growth of PLA and its blends are same.

Key words:

Nucleating agent, Isothermal crystallization, Crystallization kinetics

沈兆宏, 钱欣, 钱仕杰. 成核剂对生物降解聚乳酸结晶行为的影响[J]. 石油化工高等学校学报, 2008, 21(2): 10-14.

SHEN Zhao-hong, QIAN Xin, QIAN Shi-jie.

Effect of Nucleating Agents on the Crystallization of Poly(lactide) 

[J]. Journal of Petrochemical Universities, 2008, 21(2): 10-14.