THE ROLE OF ACTIVATING IMPURITIES IN THE FORMATION OF CATALYTIC CENTER AND THE REGULARITIES OF THE KINETICS OF ZIEGLER POLYMERIZATION

Within the framework of the concept of a multicomponent active center, we analyze the specific features describing the polymerization kineti cs for cases when the active additives (primarily water) are contained in the different constituent components of the system being polymeriz ed or simultaneously in several of the components. When the active add itives are contained in the basic components of a catalyst, that is, a transition metal compound (Z) and/or an aluminum-containing compound (Al), the rate of polymerization can show a complex pattern of the dep endence on [Z] or [Al]; in particular, it may pass through a maximum. When the active impurity occurs in the solvent or monomer, the rate of polymerization may be virtually independent on the concentration of b oth essential components of the catalyst (Z and Al), but vary with the content of solvent and show a pronounced (nonlinear) dependence on th e concentration of monomer. Calculated data on the structure of multic omponent center are discussed.