Polymerization of butadiene and isoprene in the presence of a titanium catalytic system under ultrasonic irradiation

The ultrasonic irradiation of the reaction mixture during its formation in the polymerization of butadiene and isoprene with a microheterogeneous titanium catalytic system causes acceleration of the process. In this case, the multicenter titanium catalytic system is transformed into a quasi-single-center system and the type of operating center depends on the nature of a polymerizing diene. During the polymerization of butadiene, this effect leads to an increase in the amount of trans-1,4-units and to a decrease in the average molecular masses. In the case of isoprene, the resulting polymer contains a higher amount of cis-1,4-units.