Search results for "active site modifier"

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Multi-Alkenylsilsesquioxanes as Comonomers and Active Species Modifiers of Metallocene Catalyst in Copolymerization with Ethylene.

2018

The copolymers of ethylene (E) with open-caged iso-butyl-substituted tri-alkenyl-silsesquioxanes (POSS-6-3 and POSS-10-3) and phenyl-substituted tetra-alkenyl-silsesquioxane (POSS-10-4) were synthesized by copolymerization over the ansa-metallocene catalyst. The influence of the kind of silsesquioxane and of the copolymerization conditions on the reaction performance and on the properties of the copolymers was studied. In the case of copolymerization of E/POSS-6-3, the positive comonomer effect was observed, which was associated with the influence of POSS-6-3 on transformation of the bimetallic ion pair to the active catalytic species. Functionality of silsesquioxanes and polymerization par…

Polymers and Plastics02 engineering and technologyPost-metallocene catalyst010402 general chemistry01 natural sciencesArticlelcsh:QD241-441chemistry.chemical_compoundlcsh:Organic chemistryPolymer chemistryCopolymerethylenecrosslinkingchemistry.chemical_classificationmetalloceneComonomerGeneral ChemistryPolymer021001 nanoscience & nanotechnologySilsesquioxaneethylene; polyhedral oligomeric silsesquioxanes (POSS); copolymerization; metallocene; crosslinking; active site modifier0104 chemical sciencesactive site modifiercopolymerizationchemistryPolymerization0210 nano-technologyGlass transitionMetallocenepolyhedral oligomeric silsesquioxanes (POSS)Polymers
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