聚碳酸脂的热降解性能研究  

A Study on The Thermal Degradation of Polycarbonates

作　　者：华动卿[1] 石宝忠[1] 秦倩[1] 

机构地区：[1]北京化工大学,北京100029

出　　处：《现代科学仪器》1998年第5期43-45,共3页Modern Scientific Instruments

摘　　要：本文采用TG方法研究了国内外五种PC在空气和N2中的热稳定性，采用动态FTIR方法探讨了热氧降解机理，并以TG方法计算了热降解动力学参数。结果表明，试样的平均分子量越高．分布越窄，端基活性越小，含量越少，分解温度越高。主链酯基的水解为其热氧降解的主要机理。Doyle－Ozawa积分法所得热降解活化能为117.5kJ／mol,幂前因子为1．11×107min(－1)。The thermal stability of bisphenol A poycarbonates manufactutal at fore and abnd was studied using ther-mogravimetry(TG) in air and in a nitrogn atmesphere. The mechanism of thermal - oxidative thaadation and kinetics of ther-mal degradation of polycaboates were investigated by FTIR and TG respectively. The results show that the higher the molec-ular weight and the narrower the molecular weight distribution, the higher the thermal decomposition temperature. The hydnd-ysis of ester groups in the main chain is the major step of thermal - oxidative degrtion of bisphenol A polycarbonates. The cor-responding activation energy and preexponential factor were determined by Doyle - erewa metho of int- as 117. 5 kl. mo- 1and 1. 11×107min -1.

关 键 词：聚碳酸酯 TG 热降解 PC 动力学参数 

分 类 号：TQ324.9[化学工程—合成树脂塑料工业]