Abstract
A new method for synthesis of polymer-supported organometallic titanium-magnesium catalysts was developed. The catalysts contain up to 55% of total fixed Ti in the form of isolated Ti(III) ions. Ti(III) is formed in the alkylation of Ti(IV) by polymer-supported Mg species. Ti(III) is assumed to coordinate to the polymer support moieties at low Ti(III) content, and to form layers at high Ti(III) content in the catalysts. X-ray analysis indicated the presence of crystallites with dimensions of approximately 4–7.5 nm. The catalytic activity in ethylene polymerization depends on the amount of fixed magnesium. A correlation between catalyst activity and isolated Ti(III) ion content was found. Kinetic parameters of the polymerization in the presence of titanium-magnesium catalysts supported on organic and inorganic carriers were compared. Rate constants for chain transfer to monomer, organoaluminium cocatalysts and hydrogen were calculated.
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