ABSTRACT:An investigation was made on the kinetics of copolymerization of ethylene with propylene in the presence of a soluble catalytic system (C5H5)2TiCb-Al(C2H5)2Cl in a medium of ethyl chloride. Two effects have been revealed: an increase in the rate of copolymerization with a rise in the concentration of propylene in the reaction zone, and the emergence of a cationic process of propylene oligomerization at the end of the copolymerization reaction. The methods of extraction, fractionation and infrared analysis were employed to obtain proof of the formation of copolymers. The conclusion regarding the single arrangement of propylene molecules in the polymeric chain was done. The reactivity ratio of monomers r1= 8. 7 ±0.5 was determined. The physicomechanical properties of copolymers were studied and it has been shown that the addition of small amounts of propylene to the polyethylene chain (up to 1-1.5 mol %) leads to a five-to tenfold increase in the melt index, to a reduction in rigidity and the yield value by 20-30%, and to greater breaking elongations by 10-20%.
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