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本文研究了偏氯乙烯(VDC)/丙烯腈(AN)/苯乙烯(St)三元悬浮共聚合体系的聚合机理、共聚速率、共聚物组成及其特性粘度的影响因素。实验表明随着投料配比的改变，可分成四个不同聚合机理区域。St对VDC/AN/St三元悬浮共聚有缓聚作用。VDC三元悬浮共聚速率可用半经验模型dC/dt=(C([I]0( exp(-( kdt)描述，由实验得到模型参数( 值为2.24，模型参数(、( 是聚合温度与引发剂浓度的函数。VDC-AN-St三元悬浮共聚物存在着较宽的VDC组成分布，并受到单体AN水溶性的影响，经AN动态相平衡校正后，可预测VDC三元共聚物组成。VDC-AN-St共聚物的特性粘度随着转化率的升高而增大。在相同引发剂用量下，高转化率VDC-AN-St共聚物特性粘度的对数与温度的倒数成线性关系。
In this paper, the polymerization mechanism, copolymerization rate, copolymer composition and intrinsic viscosity of vinylidene chloride (VDC) / acrylonitrile (AN) / styrene (St) ternary suspension copolymerization were investigated. Experiments show that with the feed ratio changes, can be divided into four different polymerization mechanism area. St on the VDC / AN / St ternary suspension copolymer retarding effect. VDC ternary suspension copolymerization rate can be semi-empirical model dC / dt = (C ([I] 0 (exp (- (kdt) described by the experimental model parameters (value of 2.24, the model parameters The concentration of VDC-AN-St terpolymer has a wide range of VDC composition distribution, and is affected by the water solubility of the monomer AN, after AN dynamic phase equilibrium calibration can be predicted VDC terpolymer composition .The intrinsic viscosity of VDC-AN-St copolymer increases with the conversion.The logarithm of intrinsic viscosity of VDC-AN-St copolymer with high conversion is linear with the reciprocal of temperature at the same dosage of initiator relationship.