A comparative study of tetraisobutyldialuminoxane and methylaluminoxane as cocatalysts for Cp2ZrCl2 catalyzed ethylene polymerization |
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| Authors: | S Srinivasa Reddy |
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| Affiliation: | (1) Division of Polymer Chemistry, National Chemical Laboratory, 411008 Pune, India;(2) Present address: Department of Chemistry, University of Waterloo, N2L 3G1 Waterloo, ON, Canada |
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| Abstract: | Summary The effect of A1]/Zr] mol ratio and temperature on the cocatalytic effects of tetraisobutyldialuminoxane (TIBDAO) and methylaluminoxane (MAO) for ethylene polymerization using Cp2ZrCl2 catalyst were studied. The decay type kinetic profile was observed for both TIBDAO and MAO cocatalyzed ethylene polymerizations. Catalytic activity and rate of polymerization were found to be low for TIBDAO cocatalyzed ethylene polymerization when compared to MAO cocatalyzed ethylene polymerization. The differences in catalytic activity and rate of polymerization for ethylene polymerization catalyzed by Cp2ZrCl2-TIBDAO and Cp2ZrCl2-MAO were discussed with respect to the structures of MAO and TIBDAO. An active species for Cp2ZrCl2-MAO and Cp2ZrCl2-TIBDAO catalyzed ethylene polymerizations was also discussed. The polyethylene was characterized by intrinsic viscosity measurements. |
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