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Propylene Polymerization with Bis(phenoxy‐imine) Group‐4 Catalysts Using <sup><i>i</i></sup>Bu<sub>3</sub>Al/Ph<sub>3</sub>CB(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub> as a Cocatalyst
88
Citations
47
References
2002
Year
EngineeringChemistryPropylene PolymerizationPolymersChemical EngineeringHomogeneous CatalysisHybrid MaterialsPolymer ChemistryMaterials ScienceInorganic ChemistryCatalysisOrganometallic PolymerTi ComplexCatalytic SynthesisPolymer ScienceCatalyst PreparationInorganic PolymerGroup‐4 Transition‐metal ComplexesPolymer SynthesisCatalytic Behavior
Abstract The catalytic behavior of three bis(phenoxy‐imine) group‐4 transition‐metal complexes (M = Ti, Zr, Hf), with i Bu 3 Al/Ph 3 CB(C 6 F 5 ) 4 cocatalyst systems towards propylene polymerization was investigated under atmospheric pressure at 25 °C. The Ti complex produced ultrahigh‐molecular‐weight atactic poly(propylene), whereas Zr and Hf complexes formed high‐molecular‐weight isotactic poly(propylene)s via a site‐control mechanism. The isotactic poly(propylene) obtained with the Hf complex displayed a high melting temperature of 123.8 °C. magnified image
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