文献类型：期刊文献

中文题名：聚乳酸热降解动力学

英文题名：Kinetics of Thermal Degradation of Polylactic Acid

作者：钱刚[1];王海娟[1];周兴贵[1];袁渭康[1]

机构：[1]华东理工大学联合化学反应工程研究所,上海200237

年份：2006

卷号：32

期号：3

起止页码：249

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;EI(收录号：2006189857106);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：教育部全国优秀博士论文专项基金;上海市科委"曙光"计划资助项目

语种：中文

中文关键词：聚乳酸;热降解;模型

外文关键词：polylactic acid ; thermal degradation ; modeling

摘要：在对聚乳酸进行热降解实验的基础上建立了热降解模型，拟合得到了热降解反应的速率常数和活化能，并考察了温度（180-210℃）、时间（0～120min）以及催化剂浓度等对热降解过程的影响。结果表明：在本实验条件下，聚乳酸热降解过程可只考虑分子内的酯交换反应，而不必考虑其逆反应及其他的副反应。温度越高、时间越长以及残余催化剂浓度越大，聚乳酸热降解的程度也越深。
The change of molecular weight of polylactic acid with time during a thermal treatment is modeled. In this model, reversible intramolecular transesterfication is considered. By fitting the model to experimental data, the reaction rate and activation energy can be calculated, The rate of reversed reaction is much slower than that of the forward reaction. As a result one can consider this is an near irreversible reaction under the specific reaction conditions. Temperature （180-210℃）, thermal history and catalyst concentration play important roles in thermal degradation. The rate of the molecular weight decrease is enhanced with rising temperatures and lengthening time. To a certain degree, the rate of thermal degrada tion is reduced by the removal of most catalyst left in the polymer.