Abstract

Styrene was polymerized using combined. systems of diphenylzinc, Ph 2Zn, and metallocene compounds activated by methylaluminoxane, MAO. From the various metallocenes employed bis (indenyl) zirconium dichloride, Ind 2ZrCl 2, [isopropyl (cyclopentadienyl) (1-fluorenyl) ] zirconium dichloride, i-Pr (Flu) (Cp) ZrCl 2, and bis (cyclopentadienyl) titanium dichloride, Cp 2TiCl 2, produced the larger amounts of polymer. Ph 2Zn-Cp 2TiCl 2 - MAO system gave polystyrene, PSt, whose DSC analysis indicated a major endotherm peak at 256 °C. A butanone insoluble fraction of the polymer was separated from the crude PSt. The proportion of insoluble polymer depends on the metallocene employed and on the conversion to polymer.