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Addition of CH<jats:sub>3<\/jats:sub>CCI<jats:sub>3<\/jats:sub> to the {VCl<jats:sub>3<\/jats:sub>, <jats:italic>x<\/jats:italic>AICI<jats:sub>3<\/jats:sub>} or {VCl<jats:sub>3<\/jats:sub>, <jats:italic>x<\/jats:italic>CrCI<jats:sub>3<\/jats:sub>} system, leads to a strong productivity improvement. The intensity of the activating effect depends on the nature of the support. Results suggest that the activation involves both oxidation of V(II) deactivated species into potentially active trivalent ones, and generation of new active sites. Studies on the structure of ethylene\/1\u2010hexene copolymers show that the addition of halocarbons leads to copolymers with a higher comonomer content (SCB) and a better homogeneity in composition.<\/jats:p>","DOI":"10.1002\/macp.1995.021961133","type":"journal-article","created":{"date-parts":[[2003,4,17]],"date-time":"2003-04-17T10:02:53Z","timestamp":1050573773000},"page":"3833-3844","source":"Crossref","is-referenced-by-count":10,"title":["Homo and copolymerization of ethylene: improvement of supported vanadium catalysts performance by halocarbons"],"prefix":"10.1002","volume":"196","author":[{"given":"M. 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