Title: Late Transition Metal Complexes for the Polymerization of Olefins and Vinylic Monomers
Abstract:The literature part of the thesis reviews results and proposed mechanisms for the polymerization of ethene, norbornene, and acrylate monomers. In the case of ethene, focus is on bis(imino)pyridine iro...The literature part of the thesis reviews results and proposed mechanisms for the polymerization of ethene, norbornene, and acrylate monomers. In the case of ethene, focus is on bis(imino)pyridine iron and cobalt catalysts, while for norbornene polymerization mechanisms and catalyst systems are described. Polymerization of polar monomers, particularly acrylates, is reviewed in the second part. Eighteen new iron(II) and cobalt(II) complexes with tridentate bis(imino)pyridine ligands, and eleven palladium(II) complexes with bidentate nitrogen, phosphorus, sulfur, and arsene donor atom ligands, were synthesized and characterized. The iron(II) and cobalt(II) bis(imino)pyridine complexes were formed with seven ketimine and four aldimine ligands bearing bulky aliphatic or aromatic substituents. The palladium(II) complexes were formed with three pyridinylimine and three ethyl-bridged phosphorus, sulfur, and arsene ligands. As well, five ion pair complexes were investigated. Iron(II) and cobalt(II) complexes activated with methylaluminoxane (MAO) gave highly active catalysts for the polymerization of ethene and tert-butyl acrylate. Moreover, activities from moderate to high were obtained in preliminary polymerizations of methyl acrylate, acrylonitrile, and n-vinylcarbazole. The palladium(II) complexes were activated for norbonene polymerization either by formation of distinct ion pairs or with MAO. Depending on the ligand structure the obtained activities varied between high and moderate.Read More
Publication Year: 2005
Publication Date: 2005-06-01
Language: en
Type: article
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Cited By Count: 1
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