Abstract
The activating effect of triethylamine in the VCl 3 AlR 3 system has been explained in terms of a previously proposed kinetic scheme. Activation is observed at low amine concentrations and is thought to occur by removal of adsorbed aluminium alkyl species from the catalyst surface. Deactivation occurs at higher donor concentrations and is believed to be due to competitive adsorption of donor with monomer. These proposals are consistent with the rate, molecular weight and polymer tacticity findings of other workers in Ziegler-Natta systems where the donor is capable of interaction with both the transition metal and metal alkyl components.
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