摘要
高聚物的成型加工通常在非等温条件下进行。本工作研究了解聚合物的非等温结晶行为,对选择合适的加工方法、设备,设定合适的温度以及时间对制备综合性能优异的高分子产品具有十分重要的意义。利用Avrami和莫志深方法对可生物降解的聚丁二酸丁二醇酯-聚丁二酸二甘醇酯(PBS-b-PDGS)多嵌段共聚物的非等温结晶动力学进行了详细研究。结果表明,Avrami和莫志深方法适用于该体系的非等温结晶行为,PDGS的引入没有改变共聚物的结晶机理。聚合物的结晶温度随降温速率增大而降低,相同降温速率下共聚物的结晶温度随PDGS含量增加而减小,PDGS的稀释作用是导致聚合物结晶速率减小的原因。PBSb-PDGS共聚物的非等温结晶动力学研究为其实际加工成型提供了理论依据。
The polymer processing is usually operated under nonisothermal conditions,the study on nonisothermal crystallization behaviors of polymers have very importantly practical meaning for choosing suitable processing method,equipment,temperature and time to prepare polymer materials with excellent comprehensive or desired properties.We investigated the isothermal crystallization kinetics of biodegradable poly(butylene succinate)-b-poly(diethylene glycol succinate)multiblock copolymers by the Avrami and the Mo’s method.The results showed that Avrami and the Mo’s methods can be used to describe the nonisothermal crystallization behaviors of the four samples.The crystallization mechanism almost kept unchanged while the crystallization rate decreased with an increase of PDGS content.The results also demonstrated that the decrease of crystallization rates was attributed to the dilute effect of PDGS with an increase of PDGS content in PBS-b-PDGS copolyesters.The study on the nonisothermal crystallization kinetics of PBS-b-PDGS provide theory basis for the actual processing molding.
作者
李绍龙
徐艺
陈农田
杨文锋
LI Shaolong;XU Yi;CHEN Nongtian;YANG Wenfeng(Aviation Engineering Institute,Civil Aviation Flight University of China,Guanghan 618307)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2018年第16期2882-2888,2896,共8页
Materials Reports
基金
国家自然科学基金重点项目(U1233202)
中国民用航空飞行学院科研基金青年基金(Q2018-65)
中国民用航空飞行学院科研基金面上项目(BJ2016-02)
作者简介
李绍龙:男,1988年生,博士,讲师,主要从事高性能航空材料的研究 E-mail:zlishaolong@163.com
