Study of the mechanism of propagation and transfer reactions in the polymerization of olefins by Ziegler‐Natta catalysts, 4. The kinetic scheme for propagation and chain transfer reactions

Abstract

Abstract On the basis of the experimental data on the number of propagation centers, activation energy, and rate constants of propagation and transfer reactions, a kinetic scheme for propagation and chain transfer reactions in the polymerization of olefins in the presence of Ziegler‐Natta catalysts is considered. The main features of this scheme are: (a) monometallic composition of propagation centers; (b) two‐stage mechanism of the propagation reaction: (c) the reversible adsorption of an organoaluminium cocatalyst on the titanium of the propagation center resulting in its temporary deactivation and chain transfer with an organoaluminium compound.