Cyclo‐ and cyclized diene polymers. XIII. γ‐Ray‐initiated polymerization of 1,3‐dienes

Abstract

AbstractThe γ‐ray‐initiated polymerization of butadiene, isoprene, and 2,3‐dimethylbutadiene‐1,3 was carried out at temperatures of 20°C. and −78°C. Polymers of butadiene and isoprene with mixed linear and cyclic structure were proved to result from the polymerization at −78°C. A monocyclic structure was found for the 2,3‐dimethylbutadiene‐1,3 polymers initiated either at −78°C. or in the thiourea canal complex at 20°C.