环化顺1,4丁二烯异戊二烯无规共聚物的表征

CHARACTERIZATION OF CYCLIZED CIS-1,4 RANDOM COPOLYMER OF BUTADIENE AND ISOPRENE

已知,聚异戊二烯或聚丁二烯等1,3-双烯聚合物可在路易斯酸催化剂作用下按阳离子型机理进行分子内环化反应,所得“环化橡胶”,做为可光敏固化的新材料,在光刻胶、光保护膜、胶粘剂等方面得到广泛应用。文献还表明,环化顺1,4聚双烯产物比环化其它结构的聚双烯产物具更好的使用性能。

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.