Abstract

Four 2,5-dicholorobenzoate monomers were prepared by chlorination and esterification and then polymerized to ester substituted poly(p-phenylene)s through Ni/Zn catalyzed coupling reaction. The thermal stability and pyrolysis behavior of ester substituted poly(p-phenylene)s were investigated through TGA method. The possible mechanism of thermal modification of the polymers was proposed that included de-esterification, dehydration and decarboxylation, and finally de-anhydridization. Only pyrolysis of esters substituted poly(p-phenylene)s containing two neighboring carboxyl groups may result in the formation of the corresponding anhydride.

中文翻译：

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酯取代聚对苯撑的热解行为及其微观结构排列的 TGA 测定

摘要

通过氯化和酯化制备四种2,5-二氯苯甲酸酯单体，然后通过Ni/Zn催化偶联反应聚合成酯取代的聚(对亚苯基)。通过TGA方法研究了酯取代的聚对苯撑的热稳定性和热解行为。提出了聚合物热改性的可能机理，包括脱酯化、脱水和脱羧，最后脱酐。只有含有两个相邻羧基的酯取代聚（对亚苯基）的热解可能导致相应酸酐的形成。