Abstract: A kinetic model dC/dt=α+βC1/2 for suspension polymerization of vinyl chloride was developed. Kinetic studies on such polymerization were carried out in a stainless steel tube reactor in the presence of high-, medium-, or low-activity initiators at different concentrations, and at temperatures ranging from 50 to 62℃. Twenty-six sets of kinetic data were obtained under different conditions. According to these experimental results, the acceleration behavior of vinyl chloride polymerization was discussed in detail. It is proposed that the auto-acceleration effect is due to the decrease of the termination rate constant in the polymer-rich phase and to the increase of initiator concentration owing to volume contraction during polymerization with an initiator of lower activity. All plots of dC/dt against C are nonlinear during the two-phase stage, while dC/dt versus C1/2 curves show much better linearity up to 80-70% conversion. The proposed model can he used to explain satisfactorily why the reaction order of initiators is between 0.5 and 1.0.

摘要： 本文提出了氯乙烯悬浮聚合动力学数学模型dC/at=α+βC_(1/2),用高、中、低活性引发剂进行动力学研究,发现本模型能与实验结果符合到约70%转化率,并能满意地解释引发剂反应级数在0.5—1.0之间.