Copolymerization of ethylene and styrene in the presence of the catalytic system v5-C5Mej- Ti(CHzPh)3--B(CsF& 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 13C-enriched end groups shows that the regiospeclficity 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

PAPPALARDO D;
1996-01-01

Abstract

Copolymerization of ethylene and styrene in the presence of the catalytic system v5-C5Mej- Ti(CHzPh)3--B(CsF& 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 13C-enriched end groups shows that the regiospeclficity of styrene insertion in the initiation step is largely secondary. A tentative explanation for the preferentially alternating comonomer incorporation is proposed.
1996
copolymerization; styrene; titanium
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12070/5057
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