Complexes allyles ansa-metallocene du groupe 3 pour la catalyse de (co)polymérisation du styrène
Auteur / Autrice : | Anne-Sophie Rodrigues |
Direction : | Jean-François Carpentier |
Type : | Thèse de doctorat |
Discipline(s) : | Chimie |
Date : | Soutenance en 2007 |
Etablissement(s) : | Rennes 1 |
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Mots clés contrôlés
Résumé
A family of new group 3 and lanthanides allyl ansa-metallocene complexes has been synthesized and characterized by NMR and X-ray diffraction. The performances of these discrete single-component catalysts for styrene homo- and copolymerization have been studied. The bridged cyclopentadienyl-fluorenyl complexes exhibited a good control and high stereoselectivity for the production of syndiotactic polystyrene, while bridged bis(indenyl) complexes produced highly isotactic polystyrene. The influence of the complex structure on activity and selectivity is highlighted. Besides, these catalysts allowed the synthesis of new, original polymer materials via copolymerisation of styrene with ethylene and/or isoprene. Some thermal and mechanical properties of those styrene-rich copolymers have been evaluated and suggest promising applications.