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Propene polymerization withrac-Me2Si(2-Me-Benz[e]Ind)2ZrX2 [X = Cl, Me] using different cation-generating reagents
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1998
Year
EngineeringPropene PolymerizationOrganic ChemistryChemistryChemical EngineeringMao-activated Dimethyl ComplexMacromolecular EngineeringPropene Polymerization Withrac-me2siOrganometallic CatalysisPolymer ChemistryMaterials ScienceInorganic ChemistryActive SiteOrganometallic PolymerInorganic SynthesisDifferent Cation-generating ReagentsOrganic Material ChemistryPolymer ScienceCoordination PolymerPolymerization KineticsPolymer ReactionPolymer Synthesis
Propene was polymerized with methylaluminoxane (MAO) and cationic activated rac-dimethylsilylene-2-methylbenz[e]indenylzirconocene [MBI-Cl2] and [MBI-Me2]. For cationic activation of the MBI-Me2 system tris(pentafluorophenyl)borane [I], N,N-dimethylanilinium tetra(pentafluorophenyl)borate [III] were used. The MAO-activated dimethyl complex showed higher activity with respect to the dichloride system using high catalyst concentrations and [Al]/[Zr] ratios. Most effective cationic activator for MBI-Me2 was N,N-dimethylanilinium tetra(pentafluorophenyl)borate [II] in combination with Al(i-Bu3). Using tris(pentafluorophenyl)borane [I] at different polymerization conditions or N,N-dimethylanilinium tetra(pentafluorophenyl)borate [II] in combination with Al(Et)3 no propene polymerization was observed due to the occurrence of reduction of the catalytically active site.