Syndiospecific polymerization of styrene catalyzed using polymer supported CpTiCl3

CpTiCl3 was supported on two kinds of styrene copolymer [PSOH(I) and PSOH (II)] with different hydroxyl contents and polymerization behavior of styrene using the polymer-supported catalysts was investigated. The supported catalysts show high activity and the percentage of butanone-insoluble part of the polystyrene obtained is considerably high. The supported catalysts can catalyze styrene polymerization at lower Al/Ti ratio, lower catalyst concentration and higher temperature, the molecular weight of polystyrene is also enhanced, These indicate that polymer carrier can stabilize the active sites, This effect is more obviously observed when CpTiCl3 is supported on polymer with higher hydroxyl content.