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Issue 25, 2013
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Rapid evaluation of catalysts and MAO activators by kinetics: what controls polymer molecular weight and activity in metallocene/MAO catalysts?

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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-Me2Si(2-Me-Benz[e]Ind)2ZrCl2 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.

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

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Article information


Submitted
11 Jan 2013
Accepted
19 Feb 2013
First published
05 Mar 2013

Dalton Trans., 2013,42, 9040-9048
Article type
Paper

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

F. Ghiotto, C. Pateraki, J. R. Severn, N. Friederichs and M. Bochmann, Dalton Trans., 2013, 42, 9040
DOI: 10.1039/C3DT00107E

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