Telechelic diene prepolymers. I. Hydroxyl‐terminated polydienes

Telechelic prepolymers of butadiene, isoprene, and chloroprene with hydroxyl end- groups have been prepared by the solution polymerization of the dienes under free-radical initiation. 4,4′-Azobis(4-cyano-n-pentanol) was employed as the initiator. Liquid prepolymers were obtained with molecular weights of 2000 to 20,000 and with functionalities usually greater than 2. The preparative procedure and prepolymer characterization are described.