Abstract
The polymerizations of butadiene were performed with various half-titanocenes in combination with either modified methylalumoxane (MMAO) or (C 6H 5) 3CB(C 6F 5) 4/trialkylaluminum and the latter activator showed higher catalyst activities. The substitution of an alkyloxy group for a Cl atom in CpTiCl 3 decreased activity and did not change the microstructure of polymers. CpTiBr 3 and half-titanocenes with substituents on a Cp ring exhibited lower activities, but the microstructure of higher vinyl unit contents. The results of activity suggest cationic active species of Ti(+4).
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