偏氯乙烯/丙烯腈/苯乙烯悬浮共聚合动力学  

Kinetics of Vinylidene Chloride / Acrylonitrile / Styrene Suspension Polymerization

作　　者：周树学[1] 翁志学[1] 黄志明[1] 潘祖仁[1] 

机构地区：[1]浙江大学高分子科学与工程研究所,浙江杭州310027

出　　处：《高校化学工程学报》2000年第6期563-569,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：浙江省自然基金!(批准号598062)

摘　　要：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 vinylidene chloride(VDC)/acrylonitrile(AN)/styrene(St) suspension polymerization system, polymerization mechanism, copolymerization rate, copolymer composition and intrinsic viscosity were investigated. Experimental results show that polymerization mechanism of VDC/AN/St can be divided into four regions with different initial monomer feeding ratios. Monomer St has somewhat inhabitation role in VDC polymerization. Copolymerization rate of VDC/AN/St suspension system can be described by semiempirical model dC/dt=(C([I]0( exp(-( kdt), where (, ( and ( are the model parameters.Wide VDC copolymer composition distribution was observed for VDC/AN/St terpolymerization. Besides reactivity ratio, the composition of VDC-AN-St terpolymer is also affected by the AN water solubility. After AN dynamic equilibrium between aqueous phase and monomer phase during polymerization has been considered, the VDC copolymer composition can be well predicted. Intrinsic viscosity of VDC-AN-St terpolymer increases with conversion. At the same initiator concentration, the logrithm of intrinsic viscosity of VDC-AN-St terpolymer with high conversion is a linear function of reciprocal temperature.

关 键 词：偏氯乙烯 丙烯腈 苯乙烯 悬浮共聚 动力学 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业] O631.5[理学—高分子化学]