Catalytic activity and specificity of [CpTi(OBz) 3]/MAO and [Cp *Ti(OBz) 3]/MAO for the sydiospecific polymeritation of styrene were compared.The second system is a highly active and sydiospecific catalyst for styrene polymeritation at 50 ̄90 ℃.The influence factors
such as polymerization temperature
catalyst and styrene concentration
on styrene polymerization have been studied When the final polymerization product was extracted with boling butanone for 8 h
the insoluble fraction gave 98 2% to 98 7% syndiotactic polystyrene(sPS) with high molecular weight( M v=4 66×10 5 ̄1 96×10 5) and high melting temperature(269 5 ̄270℃) The sPS obtained was characterized by GPC