Calculation of Molecular Weight Distributions of Polymers Synthesized on Multisite Catalytic Systems

摘要

Multisite catalysts, in particular, some Ziegler- Natta diene polymerization catalysts [1], are characterized by the presence of catalytic active sites of several types. Active sites of each type produce macro-molecules with individual molecular weight distribution. It depends on the kinetic parameters of reactions of chain propagation and chain transfer for various agents, with these kinetic parameters being specific for each type of active site. Analysis of the dependence between the kinetic parameters of these reactions and the molecular weight distribution of a polymer helps to solve the urgent problem of controlling the molecular weight during polymerization.