Title: Vinylic Polymerization and Copolymerization of Norbornene and Ethene by Homogeneous Chromium(III) Catalysts
Abstract: Homogeneous chromium(III) catalysts of the type [Cp′CrMeCl]2/MAO (Cp′ = cyclopentadienyl, pentamethylcyclopentadienyl, indenyl, fluorenyl) have been synthesized to investigate the influence of the electronic nature and the sterical demand of different Cp′-ligands on the polymerization and copolymerization of norbornene and ethene. In the case of norbornene polymerization the catalyst activity is increased by intensifying the electron donating character of the Cp′-ligand whereas the sterical demand affects the crystallinity of polynorbornene. The use of the [Cp*CrMeCl]2 /MAO and the [FluCrMeCl]2 /MAO catalyst for norbornene-ethene copolymerization under various polymerization conditions led to the formation of norbornene-ethene copolymers with different microstructures ranging from statistical norbornene-ethene copolymers over vinyl-terminated norbornene macromonomers to norbornene-ethene block copolymers. Furthermore highly linear, ultra high molecular polyethylene can be obtained using the [FluCrMeCl]2/MAO catalyst.
Publication Year: 2001
Publication Date: 2001-05-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 25
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