Abstract
Abstract Four new Cp*Ti compounds with ortho-substituted phenoxy ligands for the syndio- specific polymerization of styrene were prepared by the reaction of various kinds of ortho- substituted phenol with Cp*TiCl3 in the presence of triethylamine. Their catalytic properties for syndiospecific polymerization of styrene were investigated at different AlMAO/Ti ratio, different AlTIBA/Ti ratio and different polymerization temperature. All four compounds in the presence of cocatalyst methylaluminoxane (MAO) and triisobutylaluminum (TIBA) showed good performance at lower concentrations of titanium, MAO, and TIBA. Especially, ( Cp*Ti(OPhMe)3)/MAO system afforded syndiotactic polystyrene (sPS) with the highest activity and high molecular weight.
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