Abstract
Copolymerization of propylene with a small amount of ethylene and homopolymerization of propylene were performed using a highly active MgCl2/TiCl4-Et3Al/ethyl benzoate(EB) and a conventional TiCl3-Et2AlCl catalyst systems. The obtained polymers were fractionated into n-decane (C10) soluble and insoluble portions. In all homopolymer fractions with the investigated catalyst systems and copolymer fractions with TiCl3 catalyst system, the inversion of the direction of arrangement of the propylene unit was not observed by 13C-NMR analysis. On the other hand, in C10 soluble fractions of copolymer using MgCl2/TiCl4 catalyst system, regardless of the presence of EB, a significant amount of the inversion unit was detected.
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