Copolymerization of ethylene and styrene in the presence of the catalytic system η 5 -C 5 Me 5 Ti(CH 2 Ph) 3 −B(C 6 F 5 ) 3 has been investigated. Independently from the feed composition, basically alternating ethylene−styrene copolymers are obtained, together with some polyethylene and syndiotactic polystyrene, from which the former can be separated by solvent extraction. NMR analysis of suitably 13 C-enriched end groups shows that the regiospecificity of styrene insertion in the initiation step is largely secondary. A tentative explanation for the preferentially alternating comonomer incorporation is proposed.
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Pellecchia et al. (1996) studied this question.
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