Copolymerization of Ethylene with Vinyl Monomers using Heterogeneous Catalysts Consisting of α-Diimine Ni(II) Complexes Immobilized into a Fluorotetrasilicic Mica Interlayer in the Presence of an Alkylaluminum Compound



α-Diimine nickel complexes immobilized into fluorotetrasilicic mica interlayers are prepared by the reaction of an α-diimine ligand and nickel-ion-exchanged fluorotetrasilicic mica, and these are used for the copolymerization of ethylene with linear α-olefins (1-hexene, 1-octene, and 1-decene), cyclic olefins (norbornene and cyclopentene), or polar vinyl monomers (methyl acrylate and 5-hexenenitrile). The copolymerization of ethylene with α-olefins affords linear low-density polyethylene including methyl and alkyl branches. The incorporation of cyclopentene into the main chain is proved by the 13C NMR spectrum of the ethylene/cyclopentene copolymer. No significant activity is observed during the copolymerization of ethylene with norbornene, methyl acrylate, or 5-hexenenitrile.

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