Determination of the concentration of active centres and the propagation reaction rate constants of the macrochain on polymerization of ethylene on highly active catalysts

A number of variants of use of the kinetic method of determining the concentration of active centres and the propagation constant of the process of polymerization of ethylene on the catalytic system titanium-magnesium catalyst—Al( i-Bu) 2H are considered. The best results were obtained when the MWD of polyethylene was examined in the early period of polymerization. The catalytic system investigated is characterized by the presence of two types of active centres with values of the propagation constant 1500 and 10,000 1./mole·sec, respectively.