聚对苯二甲酸乙二醇酯扩链体系的结晶动力学  

Crystallization Kinetic of Chain Extended Poly( ethylene terephthalate)

作　　者：刘海明[1] 王向东[1] 刘伟[1] 刘本刚[1] 汪文昭[1] 

机构地区：[1]北京工商大学材料与机械工程学院,北京100048

出　　处：《塑料》2014年第1期41-48,共8页Plastics

基　　金：科技部科研院所技术开发研究专项资金项目(2013EG111219);北京市属高等学校人才强教计划项目(201108078)

摘　　要：为了提高聚对苯二甲酸乙二醇酯(PET)的可发性,制备性能优异的发泡材料。通常采用提高分子量的方法。研究采用多官能度环氧基化合物(MEC,multi-functional epoxy compound)为扩链剂,对PET进行改性。向PET分子链中引入支化结构以改善发泡性能。并讨论其结晶行为对发泡性能的影响。使用差示扫描量热仪研究了扩链PET体系的结晶、熔融行为和非等温结晶动力学。结果表明:随着MEC含量的增加,PET的结晶温度、熔融温度以及结晶度都下降。非等温结晶动力学研究结果表明:扩链后的PET,由于分子链中支化点增多,使PET结晶过程中的成核和增长方式发生改变,球晶数量提高,球晶半径降低,有利于控制泡孔生长并改善PET的可发性。In order to improve the foam-ability of poly （ethylene terephthalate） （PET） and prepare PET foams with excellent properties, an epoxy-based multi functional compound （ MEC ） was used as chain extender to increase the molecular weight of PET and induce long chain branching structure. The effects of chain extender content on the crystallization behavior and foam-ability were studied by differential scanning calorimeter. The results showed that the crystallization/melting temperatures and crystallinity were decreased gradually with the increasing content of MEC due to the existing of branching points induced by adding chain extender. The cellular morphology of PET foams could be controlled by the improved crystallization behavior of chain extended PET.

关 键 词：聚对苯二甲酸乙二醇酯 扩链剂 支化结构 结晶行为 结晶动力学 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]