Syndiospecific polymerization of styrene catalyzed using polymer supportedCpTiCl3

CpTiCl3 was supported on two kinds of styrene copolymer [PSOH(I) and PSOH ( II)] with different hydroxyl contents and polymerization behavior of styren e using the polymer-supported catalysts was investigated. The supported cat alysts 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 concen tration and higher temperature, the molecular weight of polystyrene is also enhanced, These indicate that polymer carrier can stabilize the active sit es, This effect is more obviously observed when CpTiCl3 is supported on pol ymer with higher hydroxyl content.