ε-己内酯/D,L-丙交酯共聚物的非等温结晶动力学研究

背景:ε-己内酯/D,L-丙交酯共聚物因具有良好的力学性能、降解性能以及生物相容性而受到广泛研究,但对其非等温结晶动力学研究相对较少。目的:了解ε-己内酯/D,L-丙交酯共聚物的非等温结晶动力学性能。方法:以实验室自制的ε-己内酯:D,L-丙交酯共聚物90:10为观察对象,采用示差扫描量热仪对其进行非等温测试,观察其结晶行为。结果与结论:随着降温速率R的增加,PCDLA的结晶温度向低温方向移动,且Avrami指数均>3,以均相成核的三维球晶方式生长;Jeziorny法和莫志深法研究结果基本一致。

Non-isothermal crystallization kinetics of degradable copolymer based on epsilon-caprolactone and D, L-lactide

BACKGROUND:Copolymers of ε-caprolactone and D,L-lactide(PCDLA) has been studied intensely for their good mechanical properties,biodegradability and biocompatibility.However,the study on non-isothermal crystallization kinetics of PCDLA has attracted less attention.OBJECTIVE:To investigate the non-isothermal crystallization kinetics of PCDLA.METHODS:PCDLA with a CL/DLLA molar ratio of 90:10 was prepared by ring-opening polymerization and differential scanning calorimetry was employed to study the non-isothermal crystallization kinetics of PCDLA.The kinetics parameters were analyzed by Avrami,Jeziorny and Mo methods.RESULTS AND CONCLUSION:The crystallization peak temperatures of PCDLA decreased with increasing cooling rate.In the process of non-isothermal crystallization,the value of Avrami index was greater than 3 for PCDLA,which demonstrates a three-dimensional spherulitic growth on homogeneous nuclei.The Jeziorny method of the corrected Avrami theories and Mo method can describe non-isothermal crystallization kinetics of PCDLA very well.