Rapid evaluation of catalysts and MAO activators by kinetics:What controls polymer molecular weight and activity in metallocene/MAO catalysts?

Ghiotto, Fabio, Pateraki, Chrysoula, Severn, John R., Friederichs, Nic and Bochmann, Manfred (2013) Rapid evaluation of catalysts and MAO activators by kinetics:What controls polymer molecular weight and activity in metallocene/MAO catalysts? Dalton Transactions, 42 (25). pp. 9040-9048. ISSN 1477-9226

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Abstract

The influence of methylaluminoxane (MAO) catalyst activators of different concentrations and preparative histories on the performance of 1-hexene polymerisations was investigated by kinetic methods, using rac-Me Si(2-Me-Benz[e]Ind)ZrCl as the standard catalyst precursor. Fast sampling and analysis allow the time dependence of monomer conversion and the growth of the number-average polymer molecular weight to be determined at a sufficiently short timescale to make this a feasible method for routine catalyst evaluation. Differences in productivity, polymer molecular weight and active species count are shown to be primarily a linear function of the trimethylaluminium concentration. The results in toluene and heptane as solvents are compared; the data show that the inferior performance in heptane is due to a substantially lower active species concentration.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
Faculty of Science
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Depositing User: Pure Connector
Date Deposited: 09 Jul 2013 08:54
Last Modified: 20 Sep 2020 23:41
URI: https://ueaeprints.uea.ac.uk/id/eprint/42956
DOI: 10.1039/c3dt00107e

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