聚乳酸-聚甲基丙烯酸二甲氨基乙酯两亲性嵌段共聚物的结晶性能  

Crystalline Properties of Amphiphilic Block Copolymer PLA-b-PDMAEMA

作　　者：唐新颖[1] 刘文涛[1] 杨阳[1] 姜皎洁 何素芹[1] 朱诚身[1] 

机构地区：[1]郑州大学材料科学与工程学院,河南郑州450052

出　　处：《高分子材料科学与工程》2015年第6期50-54,共5页Polymer Materials Science & Engineering

基　　金：河南省自然科学研究计划项目(2011B430032);河南省科学技术研究重点项目(12B430021)

摘　　要：本文利用原子转移自由基聚合(ATRP)方法合成了不同质量比的两嵌段共聚物聚乳酸-聚甲基丙烯酸二甲氨基乙酯(PLA-b-PDMAEMA),并利用差示扫描量热法和X射线衍射法研究了其结晶行为和结晶结构与两嵌段质量比的关系。结果表明,随着PDMAEMA链段聚合度的增加,共聚物的宏观形貌逐渐从不透明的粉状向透明的粘弹状转变。在一定聚合度内,共聚物的结晶完善性与聚乳酸相比逐渐降低,并导致其熔融和结晶温度与聚乳酸相比分别升高了5℃和14℃。In this paper,a series of block copolymer PLA-b-PDMAEMA were synthesized by atom transfer radical polymerization(ATRP).Dependences of crystal behavior and crystal structure on ratio of the two blocks were determined by DSC and XRD.The results show that the macroscopic morphology of the copolymer changes from opaque powder to transparent gel with increase of the degree of polymethyl methacrylate dimethylaminoethyl methacrylate(PDMAEMA).Compared with polylactic acid,in a certain degree of polymerization,the integrity of crystallinity of the copolymer decreases,which result in the melting and crystallization temperatures increased by 5 ℃ and 14 ℃,respectively.

关 键 词：两嵌段 聚乳酸 聚甲基丙烯酸二甲氨基乙酯 结晶 

分 类 号：TQ317[化学工程—高聚物工业]