ESR STUDY ON SIO2-SUPPORTED HALF-TITANOCENE CATALYST FOR SYNDIOSPECIFIC POLYMERIZATION OF STYRENE

Monocyclopentadienyltitanium trichloride (CpTiCl3) was directly immobi lized on silica surface. The resulting CpTiCl3/SiO2-MAO was investigat ed in view of its suitability for syndiospecific polymerization of sty rene using ESR spectroscopy. Polymerization results show that both the syndiotacticity and the activity decrease upon immobilization. A poss ible explanation is that the active sites may become aspecific lifter immobilization and part of the immobilized active sites can be leached into the solution in the presence of MAO.