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.
出处
《塑料科技》
CAS
北大核心
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)
关键词
聚乳酸
多重熔融转变
等温结晶温度
熔融温度
PLA
Multiple melting transformation
Isothermal crystallization temperature
Melting temperature
