Copolymerization of ethylene and styrene in the presence of the catalytic system eta(5)-C(5)Me(5)-Ti(CH(2)Ph)(3)-B(C6F5)(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 C-13-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.

Alternating ethylene-styrene copolymerization with a methylaluminoxane-free half-titanocene catalyst

PELLECCHIA, Claudio;ZAMBELLI, Adolfo
1996

Abstract

Copolymerization of ethylene and styrene in the presence of the catalytic system eta(5)-C(5)Me(5)-Ti(CH(2)Ph)(3)-B(C6F5)(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 C-13-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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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11386/3131754
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