阐明了聚对苯二甲酸乙二酯缩聚过程中热降解与羧基含量的关系.发现,钛酸四丁酯或草酸亚锡作为缩聚催化剂时,在整个高真空阶段羧基含量并不是一直增加的.采用三种方法(TGA、[η]和COOH)求热氧化降解速度常数,并对其结果进行了讨论.探讨了单一或复合稳定剂和缩聚催化剂对热氧化降解的影响. The relationship between the thermal degradation and carboxyl content of poly (ethylene terephthalate) during polycondensation was elucidated.It was found that the content of carboxyl group did not increase continuously during the high vacuum phase when tetrabutyl titanate or stannous oxalate was used as polycondensation catalyst. Three methods (TGA, [η] and COOH) were used to determine the thermal oxidation degradation rate constants, and the results were discussed. The effects of single or complex stabilizers and polycondensation catalysts on thermal oxidative degradation were discussed.