HYDROBORATION COPOLYMERIZATION OF DIENES AND DICYANO COMPOUNDS WITH THEXYLBORANE

We describe here the synthesis of boron-containing copolymers having t wo different segments of organoboron and cyclodiborazane units by the combination of hydroboration polymerization of dienes and that of dicy ano compounds with thexylborane. While an organoboron polymer from the xylborane and diene has no UV absorption, the reaction mixture of thex ylborane, diene and dicyano compound gave the polymer which had the pe ak top molecular weight around 9000 in GPC detected by UV. This result indicates that the polymer obtained from these three monomers might b e the copolymer having two segments, The composition of two segments i n copolymer was determined by H-1 NMR, and could be easily controlled by the feed ratio of dienes and dicyano compounds. From the results of air-bubbling experiments, the copolymers were found to have block-typ e structures. Various dienes and various dicyano compounds were used i n this hydroboration copolymerization with thexylborane to produce the corresponding boron-containing copolymers.