Abstract
Both the homopolymerization of ethylene, propylene, 1-hexene and 1,3-butadiene and the copolymerization of ethylene with these monomers were conducted over the SiO2-supported TiCl4 catalyst using AlEt2Cl or AlEt3 as a reducing reagent. With an increase in the concentration of AlEt3, the polymerization activities except for ethylene markedly decreased and the structures of the copolymers drastically changed to polyethylene. From these results, a correlation was established between the oxidation states of titanium and the polymerization activities for these monomers.
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