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星形聚L-乳酸的热分解动力学研究 被引量:3

Kinetic study on thermal degradation of star shaped poly(L-lactide)
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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
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参考文献8

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