复合茂钛催化剂制备宽分子量分布间规聚苯乙烯的研究

Preparation of Syndiotactic Polystyrene Having Broad Molecular Weight Distribution with Catalyst Mixture of Titanocenes

摘要: 采用新型茂钛化合物Cp^*Ti(O-Ph-OCH3)3(A)／CpTi(O-Ph-OCH3)3(B)和Cp^*Ti(O-Ph-OCH3)3(A)／Cp^*Ti(O-Ph-F)，(C)作为复合催化剂，在甲基铝氧烷(MAO)、三异丁基铝(TIBA)激活下进行苯乙烯间规聚合。采用A／B复合催化剂可通过调节两种茂钛催化剂的摩尔配比，得到宽分子量分布的间规聚苯乙烯(s-PS)；而采用A／C复合催化剂得到的产物分子量分布基本不变。对不同聚合条件下得到的s-PS产物进行了GPC分析。

Abstract: Using a mixture of two kinds of Ti complexes Cp~* Ti (O-Ph-OCH_3) _3/CpTi (O-Ph-OCH_3)_3, which has different catalystic characteristic, the prepared syndiotactic polystyrene had broad molecular weight distribution with polydispersity index over 5, even d