Search results for "Active site modifier"

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Tri-alkenyl polyhedral oligomeric silsesquioxanes as comonomers and active center modifiers in ethylene copolymerization catalyzed by bis(phenoxy-imi…

2018

Abstract In copolymerization of ethylene (E) with tri-alkenyl-silsesquioxanes (POSS-6-3 and POSS-10-3) were used bis(phenoxy-imine) titanium, zirconium and vanadium catalysts, as well as salen-type vanadium catalysts. There were obtained copolymers with POSS-R-3 units as side branches of polymer chains. The type of employed bis(phenoxy-imine) titanium, zirconium and vanadium catalysts and salen-type catalyst of vanadium determined the copolymer chain termination reactions, as well as the mechanism of modification of the active species by the POSS-R-3 comonomer. POSS-R-3 comonomers caused selective poisoning of bis(phenoxy-imine) zirconium catalyst and they provided protection against tight …

V complexes salen-type complex of VImineActivationchemistry.chemical_elementVanadium02 engineering and technology010402 general chemistry01 natural sciencesCatalysissilsesquioxanes (POSS-R-3)CatalysisActive centerEthylenechemistry.chemical_compoundCopolymerizationPolymer chemistryCopolymerZirconiumTri-alkenyl polyhedral oligomericZrProcess Chemistry and TechnologyComonomerActive site modifier021001 nanoscience & nanotechnologyBis(phenoxy-imine) Ti0104 chemical scienceschemistry0210 nano-technologyTitaniumApplied Catalysis A: General
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