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 TiCl 4 -(C 2 H 5 ) 2 AlCl in the presence of boron nitride and graphite on the kinetic parameters of propylene polymerization and on the properties of the forming polymer was studied. It was shown that, at 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 the catalyst and the type of support influence the nature of the isotactic active centers that are formed on the surface. With the help of IR and 13 C NMR spectroscopy and gel chromotography, several characteristics of the polypropylene formed were investigated