Abstract
A study has been made of the time dependence of the electrical conductivity of the catalytic system for polymerization of ethylene, VO(OC2H5)3Al(C2H5)2Cl, dissolved in n-heptane, at various concentrations and molar ratios of components. The kinetics of the chemical reactions occurring in the system are described approximately by a set of differential equations involving three slow stages. The rate constants of two of the reactions were found from the kinetic curve of the electrical conductivity of the system obtained under conditions for occurrence of any one of the reactions. The rate constant of the third reaction was determined by solution on a computer of the set of equations, using the two known constants and the kinetic curves of electrical conductivity obtained under conditions for the occurrence of all three stages. Kinetic curves of formation and decay of complexes active in polymerization were calculated for various concentrations and ratios of the components of the system. It is shown that acceleration of deactivation of the system in the presence of monomer is caused by decay of active complexes during polymerization by termination of propagating polymer chains.
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