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合成了聚苯乙烯负载的单茂钛催化剂 ,并与格氏试剂 (RMg Br)组成催化体系 .考察了聚合温度、催化体系的组成、单体浓度、Mg/Ti摩尔比、聚合时间等条件对苯乙烯聚合的影响 .结果表明 ,采用负载单茂钛催化剂与助催化剂格氏试剂反应 ,可以制备出具有较高催化活性的催化剂 .DSC表明 ,不溶于沸丁酮的聚苯乙烯具有一定的定向性 .聚合物的 1 3C- NMR测试表明 ,该催化体系的聚合机理可能是 :苯乙烯插入 M- C键 ,以一级插入反应进行链增长 ,最后以 β- H及 β-苯基消除反应致链终止
Polystyrene-supported monochroman titanium catalyst was synthesized and composed of Grignard reagent (RMg Br). The effects of polymerization temperature, catalyst system composition, monomer concentration, molar ratio of Mg / Ti and polymerization time Styrene polymerization.The results show that the catalyst with higher catalytic activity can be prepared by the reaction of supported titanocene catalyst with Grignard reagent.DSC shows that the polystyrene insoluble in zeolite has a certain orientation The 1 3C-NMR measurement of the polymer shows that the polymerization mechanism of the catalytic system may be that styrene is inserted into the M-C bond and undergoes a chain insertion by a first-order insertion reaction and finally takes β-H and β-phenyl elimination reaction Cause chain termination