热处理对PLLA/PDLLA共混物冷结晶行为的影响  

Influence of Thermal Treatment on Cold Crystallization Behavior of PLLA/PDLLA Blends

作　　者：吕瑞华[1] 邹淑芬[1] 那兵[1] 潘华燕[1] 

机构地区：[1]东华理工大学化学生物与材料科学学院,江西抚州344000

出　　处：《东华理工大学学报（自然科学版）》2012年第4期394-397,共4页Journal of East China University of Technology(Natural Science)

基　　金：江西省青年科学家培养对象(20112BCB23023);江西省教育厅资助项目(GJJ11138)

摘　　要：采用差示扫描量热法(DSC)和原子力显微镜(AFM)研究了热处理对左旋聚乳酸(PLLA)及其与消旋聚乳酸(PDLLA)1∶1共混物冷结晶行为的影响。结果表明,热处理后PLLA结晶速率的加快是通过增强成核过程来实现的;冷却速率越慢,成核效应越显著,PLLA的结晶速率则越快。相比于PLLA,PLLA/PDLLA共混物的成核效应却表现出对冷却速率不敏感,与非结晶性PDLLA阻碍了热处理过程中局部有序结构的形成有关。Effect of thermal treatment on the cold crystallization of PLLA and PLLA/PDLLA （ PLLA/PDLLA = 1 ： 1 ） blends has been studied by differential scanning calorimetry （DSC） and atomic force microscopy （AFM） measurements. Results show that the acceleration in the cold crystallization of PLLA arises from the enhanced nu- cleation after the thermal treatment. The slower is the cooling rate, the higher is the nucleation effect. As com- pared to PLLA, the change of nucleation ability with respect to cooling rate becomes less significant in the PLLA/ PDLLA blends, originating from that amorphous PDLLA prevents the formation of local order during thermal treat- ment.

关 键 词：左旋聚乳酸 消旋聚乳酸 共混物 热处理 冷结晶 

分 类 号：TQ317.4[化学工程—高聚物工业]