The role of Lewis bases on the improvement of the stereospecificity and activity of TiCl3/AlClEt2 catalyst system |
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Authors: | Fernanda M. B. Coutinho Luiz C. Santa Maria |
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Affiliation: | (1) Instituto de Macromoléculas, Universidade Federal do Rio de Janeiro, P.O. Box 68525, 21945 Rio de Janeiro, RJ, Brasil |
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Abstract: | Summary The effect of di-n-butyl ether (DBE) in the synthesis of a highly active propylene polymerization catalyst was studied. Electron-donors having ester and phosphate groups (ethyl benzoate-EB, diisobutyl phthalate-DIBP and tri-n-butyl phosphate-TBP) were added as second internal bases (IB2) to the catalysts prepared by the reduction of TiCl4 with AlClEt2 (DEAC) in the presence of DBE as a first internal base (IB1). The crystalline forms were examined for all catalyst samples by X-ray method. Special attention has been paid to the -TiCl3 samples showing the best catalytic properties. These catalysts were evaluated in propylene polymerization in the absence and presence of external bases (EB, DIBP and DBE). The effects of internal and external bases on the catalyst activity and stereo-specificity are discussed. |
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