双(对-羧苯基)苯基氧化膦与乙二醇的自催化聚酯化反应动力学

KINETICS OF POLYESTERIFICATION OF BIS(4-CARBOXYPHENYL) PHENYL PHOSPHINE OXIDE WITH ETHYLENE GLYCOL

在不同的恒定反应温度和不同的初始摩尔比下 ,进行了双 (对 -羧苯基 )苯基氧化膦 (BCPPO)与乙二醇的自催化聚酯化反应。针对该反应过程包含非均相和均相两个反应阶段这一特征 ,提出了 BCPPO在反应混合物中溶解度和该反应清晰点的计算方法。在此基础上将 Chen和 Wu提出的自催化聚酯化反应的动力学模型修改为两个分别适用于非均相和均相反应阶段的速率方程。这两个速率方程与实验结果相一致 ,并计算得到了该反应的速率常数和活化能。

The self catalyzed polyesterification of bis(4 carboxyphenyl) phenyl phosphine oxide(BCPPO) with ethylene glycol was carried out under different constant reaction temperatures and at various ratios of ethylene glycol to BCPPO. In view of the characteristic that the reaction process consists of non homogeneous and homogeneous two reaction stages, the calculation equation of the solubility of BCPPO in the reaction mixture and that of the clear point of the reaction were proposed, respectively, and then the kinetic model proposed by Chen and Wu for self catalyzed polyesterification was modified into two rate equations which were used for the non homogeneous and homogeneous reaction stages respectively. The two rate equations fitted the experimental data. The reaction rate constants and activation energy were calculated.