聚乳酸的多重熔融转变与冷结晶行为研究  

Study on Multiple Melting Transformation and Cold-Crystallization Behaviors of PLA

作　　者：辛长征[1] 张浩[1] 王延伟[1] 于翔[1] 

机构地区：[1]河南工程学院材料与化学工程学院,河南郑州450007

出　　处：《塑料科技》2017年第1期74-77,共4页Plastics Science and Technology

基　　金：河南工程学院功能纺织高分子材料科技创新团队(CXTD2013004);郑州市重点科技攻关项目(郑州市科技局141PPTGG392);河南工程学院博士基金(D2015019)

摘　　要：利用差示扫描量热仪(DSC)对不同数均分子量(M_n)的聚乳酸(PLA)晶体的多重熔融转变及冷结晶行为进行了研究。结果表明:PLA的多重熔融转变行为明显受M_n及等温结晶温度(Tc)等因素的影响,即Mn或Tc越低,PLA多重熔融现象则越明显;PLA的多重熔融转变是由于熔融再结晶所致;由半结晶性聚合物的三相模型可知,M_n越高,PLA越易在较低温度发生冷结晶现象。The multiple melting transformation and cold-crystallization behaviors of polylactic acid（PLA） crystals with different number average molecular weight（M_n） were investigated by differential scanning calorimetry（DSC）. The results show that： The multiple melting behavior of PLA crystals can be obviously influenced by isothermal crystallization temperature（Tc） or M_n. With the decreasing of Tc or M_n, the multiple melting transformation phenomenon becomes more obvious. The multiple melting transformation of PLA crystals is caused by melting-recrystallization. According to the three-phase model of semicrystalline polymer, the cold-crystallization takes place at lower temperature with the increasing of M_n.

关 键 词：聚乳酸 多重熔融转变 等温结晶温度 熔融温度 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]