The sequential copolymerization of butadiene-propylene over the catalytic system TiCl 4Al(iso-C 4H 9) 3CH 3COC 6H 5

Abstract

The study of the butadiene copolymerization with propylene over the complex catalysts TiCl 4Al(iso-C 4H 9) 3- (I), TiCl 4CH 3COC 6H 5Al(iso-C 4H 9) 3 (II) has shown that copolymers consisting of alternating propylene and trans-butadiene units form in both cases. The effect of the copolymerization conditions over catalyst II on the copolymer structure has been investigated. A temperature elevation and increase of the butadiene content in the initial mixture causes an increase of the contents of cis-1,4- and 1,2-bonds at the expense of the trans-1,4-bonds content of the butadiene chain units. The main principles of the alternating butadiene-propylene copolymerization were studied over complex catalyst II. The orders of the reactions with respect to the monomer and the catalyst were established, the apparent rate constant and the activation energy of the process were determined.