Abstract
For two stereospecific metallocene catalysts, namely, syndiospecific Ph2CCpFluHfMe2 and isospecific rac-Me2SiInd2ZrMe2, the introduction of Lewis bases into a reaction medium was shown to promote a marked rise in the efficiency of catalytic systems. In the case of the syndiospecific metallocene, the maximum effect of the base (a 10-fold increase in activity) was achieved using the (Ph2CCpFluHfMe2 + Ph3N)/CPh3B(C6F5)4 catalytic system in the presence of Al-i-Bu3 at a molar ratio of Al: Hf: B: N = 15: 1: 1: 1. When the polymerization of propylene was carried out in the presence of Al-i-Bu3 and Ph3N, an elastomeric stereoblock syndio/atactic polypropylene was produced. For the (rac-Me2SiInd2ZrMe2 + amine)/CPh3B(C6F5)4 catalytic system, a 15-to 30-fold increase in activity was observed upon introduction of amines of the aniline type: Me2NPh, Me-n-BuNPh, and NPh3.
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Original Russian Text © E.A. Sanginov, A.N. Panin, S.L. Saratovskikh, N.M. Bravaya, 2006, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2006, Vol. 48, No. 2, pp. 197–205.
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Sanginov, E.A., Panin, A.N., Saratovskikh, S.L. et al. Metallocene systems in propylene polymerization: Effect of triisobutylaluminum and lewis bases on the behavior of catalysts and properties of polymers. Polym. Sci. Ser. A 48, 99–106 (2006). https://doi.org/10.1134/S0965545X06020015
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DOI: https://doi.org/10.1134/S0965545X06020015