不饱和聚酯缩聚反应动力学

Study on Kinetics of Polycondensation of Diethylene Glycol with Anhydrides

在反应温度175—21O℃和醇/酸摩尔比为1.1的条件下,研究了二甘醇-顺酐、二甘醇-苯酐二元体系和二甘醇-苯酐-顺酐三元体系的缩聚反应动力学特征。结果表明,二甘醇-顺酐体系在转化率40—95％范围时,各个温度下的反应均为二级;而二甘醇-苯酐体系在转化率小于65％时为二级反应,大于65％时变为三级反应。二甘醇-苯酐-顺酐三元体系,无催化剂时属三级反应,外加催化剂时为二级反应。测定了各体系反应的活化能。

Under the conditions of reaction temperature ranging from 175—210℃ and alcohol/acid mole ratio of 1.1 the characteristics of polycondensation of the binary systems of diethylene glycol and maleic anhydride, diethylene glycol and phthalic anhydride, and the ternary system of diethylene glycol, phthalic anhydride and maleic anhydride were studied. The results showed that for diethylene glycol-maleic anhydride system the reaction was of the second order at different temperatures and within 40—95％ conversion, while for diethylene glycol-phthalic anhydride system the reaction was of the 2nd or 3rd order depending on whether the conversion was lower or higher than 65％. For the ternary system of diethylene glycol-phthalic anhydride-maleic anhydride the reaction was of 3rd order in the absence of catalyst, and of 2nd order in the presence of the catalyst. The corresponding activation energy were also determined.