文献类型：期刊文献

中文题名：聚对苯二甲酸丁二醇酯的热重分析

英文题名：Thermogravimetric Analysis of Polybutylene Terephthalate

作者：黄婕[1];齐文杰[1];周晴[1];唐黎华[1];朱子彬[1]

机构：[1]华东理工大学化学工艺研究所,上海200237

年份：2005

卷号：31

期号：6

起止页码：804

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：2006049664199);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：热重法;动力学;聚对苯二甲酸丁二醇酯;活化能

外文关键词：thermal degradation ; kinetics ; polybutylene terephthalate ; activation energy

摘要：用热重分析法(TGA)探讨聚对苯二甲酸丁二醇酯(PBT)热降解的动力学,揭示了PBT的热稳定性、热解反应级数和热解活化能.以高纯度氮气为载气,在不同载气流量、不同升温速率下对PBT进行降解,通过失重曲线和微商曲线分析其结构的稳定性,建立反应动力学方程.结果表明:PBT作为工程塑料在高温下有较好的稳定性,在N2中降解过程为一阶失重,流量对降解几乎没有影响;增大升温速率,分解的起始温度、失重平衡温度和最大失重率温度均呈增加趋势.PBT的热解可分为两个阶段,降解前期,即失重率在25%～50%之前,可视为零级反应,其平均活化能为261.3 kJ/mol,降解反应的中后期直至完全降解,可视为一级反应,其平均活化能为186.7 kJ/mol.升温速率对两段降解的温度区间划分有影响,随着升温速率增加,零级反应温度范围逐渐扩大.
Kinetics of thermal degradation of polybutylene terephthalate（PBT） was investigated using the method of gravimetric analysis （TG.DTG）. With different heating rates and gas flow, the thermal degradation process of PBT was studied in N2 through TG.DTG spectra. The kinetic equation was founded. The results showed that PBT had a good stability. The gas flow rate had almost no effects on the process. The degradation origination temperature, weight loss equilibrium temperature and degradation temperature peak went up with the heating rates rising. The apparent reaction order of PBT in N2 was 1, but 0 at the beginning. The activation energy was varied with the reaction order.