Abstract
Propene polymerization was conducted using [t-BuNSiMe2(C5Me4)]TiMe2 combined with various cocatalysts at 0°C, and kinetic profiles were investigated under atmospheric pressure of propene in a semibatch system. Dried methylaluminoxane (MAO), which was free of Me3Al, was found to be more active than the standard MAO system, resulting in a steady polymerization rate and giving higher molecular-weight polypropenes. Sampling experiments during the polymerization showed an almost linear relationship between the number-average molecular weight, M̄n, and polymerization time while retaining a narrow molecular-weight distribution, whereas the results of batch polymerization with different monomer concentrations and post-polymerization indicated that chain transfer reactions occurred to a minor degree under these polymerization conditions. Additive effects of trialkylaluminium on the dried MAO system showed that the polymer yield was increased by the addition of i-Bu3Al and Oct3Al and decreased by Me3Al and Et3Al. All of the trialkylaluminium compounds increased the number of polymer chains (N), and the Et3Al system showed the highest N value with the lowest M̄n value.
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