Synthèse et Evaluation de Banques de Catalyseurs à base de Métaux de Transition pour la (Co)Polymérisation Contrôlée du Méthacrylate de Méthyle, du Styrène et de l'Ethylène

Thèse de Doctorat de l'Université de Rennes

Acetyl-hydroxy-fulvene: A new ligand for chromium-catalyzed polymerization of ethylene at room temperature. Crystal structures of the ligands and chromium complex

International audienceIn the field of transition metal catalysts for olefin polymerization, the discovery of new chelating ligands has attracted significant interest. This paper reports on the polymerization of ethylene with new chromium based catalysts containing an acetyl-hydroxy-fulvene ligand. A parallel method was applied to screen eleven metal salts versus two different functionalized fulvene ligands. A direct visual analysis showed solid PE formation only in vials containing a chromium salt after 1 h of polymerization at 35 °C and 15 bar. This preliminary screening was followed by optimization studies to obtain high activities (up to 5 tPE/(mol·h)). ORTEP structures of the corresponding ligands and of the best catalysts were reporte

N-Tripodal Ligands to Generate Copper Catalysts for the Syndiotactic Polymerization of Methyl-Methacrylate. Crystal structures of copper complexes

International audienc