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以五甲基环戊二烯基三苄氧基钛化合物 [Cp Ti(OBz) 3 ]为主催化剂 ,改性甲基铝氧烷作助催化剂 ,采用单体顺序投入法 ,合成了聚丙烯 b 间规聚苯乙烯嵌段共聚物 .外加三异丁基铝可以使活性中心的氧化态由Ti(Ⅳ )还原为Ti(Ⅲ ) ,从而提高苯乙烯共聚单体的转化率 .实验表明此催化体系对共聚物的合成具有较高活性 ,适宜的茂钛化合物浓度可阻止活性中心被丙烯预聚物包埋 .抽除残余丙烯气也可促进苯乙烯的共聚合 .对聚合产物进行溶剂连续萃取 ,可分离出嵌段共聚物 ,并用 13 CNMR和DSC进行结构表征
Using pentamethylcyclopentadienyl tribenzyloxy titanium compound [Cp Ti (OBz) 3] as the main catalyst and modified methylaluminoxane as a cocatalyst, the monomer b Syndiotactic polystyrene block copolymer with the addition of triisobutylaluminum can reduce the oxidation state of the active site from Ti (Ⅳ) to Ti (Ⅲ), thereby increasing the conversion of styrene comonomer. The experiments show that this catalyst The system has high activity for the synthesis of copolymer, suitable concentration of titanocene can prevent the activity center is embedded in propylene prepolymer .Practical removal of residual propylene gas can also promote the copolymerization of styrene .Polymerization products were solvent continuous extraction , The block copolymer can be isolated and characterized by 13 CNMR and DSC