Styrene polymerization in the presence of the CpTiCl3/Al2O3–SiO2/MAO catalytic system

Syndiotactic polymerization of styrene in the presence of heterogenized hemititanocene catalysts CpTiCl₃/Al₂O₃–SiO₂/MAO (Cp = cyclopentadienyl; MAO = methylaluminoxane) showed that the yield and selectivity of this reaction depend on the support composition, i.e. on the Al₂O₃ content in the support. The most active catalysts contained Al₂O₃ in a quantity of 50 to 70 wt%. Despite a relatively lower selectivity of 75–59%, the amount of syndiotactic polystyrene in the presence of those catalysts was the greatest. Copyright © 2002 John Wiley & Sons, Ltd.