PABA与PET共聚合反应的研究Ⅲ．共聚动力学及相关问题讨论

STUDIES ON THE PABA/PET COPOLYMERIZATION Ⅲ.COPOLYMERIZATION KINETICS AND DISCUSS OF PROBLEMS CONCERNED

研究了ＰＡＢＡ与ＰＥＴ共聚合反应动力学，表明随反应温度升高，反应速度增加，可近似看成一级反应。考察了乙二醇对聚对羟基苯甲酸酯的醇解作用，表明基本上不发生醇解反应。根据ＰＡＢＡ自聚反应、ＰＥＴ酸解反应等研究结果，结合本文的工作，讨论了提高ＰＥＴ／ＰＨＢ共聚酯分子量和改进序列分布的问题。

Reaction kinetics of copolymerization of p-acetoxyl-benzoic acid(PABA) and polythylene terephthalate(PET)has been studied.The results are shown that the reaction velocity increases with the increasing of reaction temperature and it can be approximately considered as first-order reaction.The alcoholysis of ethylene glycol (EG)on poly(p-hydroxy benzoate)(PPHB)has been investigated and it is shown that the alcoholysis reaction is not happened on the whole.On the basis of the results of studying on PABA self-polymerization and PET alcoholysis reaction,and combine the work of this paper,the problems of enhancing the molecular weight of PET/PHB copolyester and improving sequence distribution are discussed.