CHARACTERIZATION OF CYCLIZED CIS-1,4 RANDOM COPOLYMER OF BUTADIENE AND ISOPRENE
环化顺1,4丁二烯异戊二烯无规共聚物的表征

The cis-1,4 random copolymers of butadiene and isoprene obtained by using a rare earth catalyst are cyclized in the presence of AlEt2Cl-PhCH2Cl system. The cyclized products are characterized by IR > 1H-NMR and pyrolysis gas chromatography. It was proved that the both units of butadiene and isoprene also take part in the cyclization, but the degree of cyclization of isoprene unit is more than that of butadiene unit.