POLYMERIZATION OF STYRENE BY DIPHENYLZINC-ADDITIVE SYSTEMS - PART VII- PH2ZN-(N-BUCP)(2)TICL2-MAO SYSTEMS

The polymerization of styrene using the combined system diphenyl zinc- bis(n-butylcyclopentadienyl) titanium dichloride-methylaluminoxane, Ph 2Zn-(n-BuCp)(2)TiCl2-MAO, in toluene at 60 degrees C, produced highly syndiotactic polystyrene, confirming that Ph2Zn-titanocene-MAO are goo d initiator systems for the stereoregular polymerization of styrene. T he syndiotacticity of PS was established by its insolubility in chloro form, benzene or toluene, and after continuous extraction in boiling b utanone. DSC analysis showed endotherm signals corresponding to the me lting temperature, T-m, of syndiotactic polystyrene.