STEREOSPECIFIC POLYMERIZATION OF PROPYLENE IN THE PRESENCE OF HIGHLY DISPERSED GRAPHITE AND BORON-NITRIDE

The influence of the method of formation of the catalytic system TiCl4-(C2H5)2AlCl in the presence of boron nitride and graphite on the kinetic parameters of the propylene polymerization process, and on the properties of the forming polymer was studied. It was shown that on the formation of the Ziegler-Natta catalytic system in the presence of the supports used, highly reactive stereospecific systems can be obtained for propylene polymerization. The method of preparing catalyst and the type of support influence the nature of the isotactic active centers which are formed on the surface. With the help of I R and NMR C-13 spectroscopy and gel-chromatography, several characteristics of the forming polypropylene were investigated.