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- W2031434554 abstract "Effects of heterogenization parameters on compositional and catalytic properties of Et(Ind)2ZrCl2 supported on silica modified with MAO were evaluated using data on metal loading, catalyst activity in ethylene–propylene copolymerization, and polymer properties. The supported catalysts were prepared according to a 23 factorial design for multivariate analysis. The parameters studied were: MAO concentration in impregnation, Et(Ind)2ZrCl2 concentration in grafting, and immobilization temperature for both metallocene and organoaluminum. The grafting solution was monitored by UV–VIS spectroscopy, while the resulting catalyst systems were characterized by inductively-coupled plasma-optical emission spectroscopy (ICP-OES), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), and X-ray photoelectron spectroscopy (XPS). At high statistical significance, both MAO and Et(Ind)2ZrCl2 concentrations during preparation affected the determination of the final Al/Zr ratio on silica. The catalyst systems were tested in ethylene–propylene copolymerizations using external MAO as cocatalyst. Relationships were observed between (i) catalyst activity and the binding energy of Zr 3d5/2 electrons and (ii) Al/Zr ratio on silica and the average ethylene incorporation. The polymer samples presented narrow molecular weight distribution, but according to differential scanning calorimetry (DSC), and cross-fractionation chromatography (CFC) data, catalyst systems with given Al/Zr ratios might yield different crystallites, suggesting a plural distribution of chemical composition." @default.
- W2031434554 created "2016-06-24" @default.
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- W2031434554 date "2001-03-01" @default.
- W2031434554 modified "2023-10-14" @default.
- W2031434554 title "Effects of Al/Zr ratio on ethylene–propylene copolymerization with supported-zirconocene catalysts" @default.
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- W2031434554 doi "https://doi.org/10.1016/s1381-1169(01)00045-0" @default.
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