摘要
利用TG、DTG方法研究了星形聚乳酸在N2气氛中不同升温速率β时的热分解过程和动力学。结果表明随着升温速率的提高,聚合物的热分解温度逐渐升高。同时利用Freeman-Carroll法、Achar法和Coats-Redfen法进行了动力学处理,确定了星形聚乳酸的热分解反应机理为收缩圆柱体,对应函数名称为相边界反应,表观活化能范围为128.61~134.79 kJ/mol,lnA为23.46~25.28。
At different heating rates(β) the thermal degradation process of star shaped poly(L-lactide) is a one-step reaction in N2,which is confirmed by TG and DTG.The degradation temperature rises with the increase of β.The parameters of thermal degradation kinetics of the star shaped poly(L-lactide) have been obtained by Freeman-Carroll method,Achar method and Coats-Redfen method.The most probable kinetic mechanism of the thermal decomposition is phase boundary reaction,and the corresponding mechanism follows Contraction Cylinder.The apparent activation energy and lnA are 128.61-134.79 kJ/mol and 23.46-25.28,respectively.
出处
《现代化工》
CAS
CSCD
北大核心
2009年第S2期175-177,179,共4页
Modern Chemical Industry
基金
北京市属市管高等学校人才强教计划资助项目
北京市教委科技发展计划资助项目(KM200810017007)
关键词
星形聚乳酸
热分解
动力学
star shaped poly(L-lactide)
thermal degradation
kinetics