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Т. A. Sukhova, F. S. D’yachkovskii, G. Р. Belov


Characterization of 1-butene polymerization in the presence of graphite-supported complex organometallic catalysts


Polimery 1989, No 6-7, 297


DOI: dx.doi.org/10.14314/polimery.1989.297


Summary

The course of the gas-phase polymerization of 1-butene with the graphite-supported catalytic systems of TiCl4+AlEt2Cl and TiCl4+AlEt3 has been investigated. With the first of these two systems it is possible to prepare in a high yield poly-l-butene with isotacticity index as high as 98.4% It has been found that a decisive role in the kinetic dependencies and in the steric composition of poly-1-butene plays not valence of titanium, but the structure of active centre resulting from binding titanium with the graphite support and depending on the conditions of catalyst formation. By means of an electron microanalyzer the distribution of Ti, Al, and Cl atoms on the surface of graphite and inside its structure in the subsequent stages of catalyst synthesis has been investigated. It has been found that as a result of reaction of graphite with the components of TiCl4-AlEt2Cl system no laminar structure of graphite with these compounds is formed. Atoms of Al, Ti, and Cl are present in the form of associates of graphite surface and, via pores, penetrate into its deeper layers. An activation with a cocataiyst results in a change in the composition of these associates. Polymerization of olefins takes place both on the external and on the internal surfaces of graphite, without changing its interplanar distances.


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