Stress–birefringence properties of styrene–isoprene block copolymers

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Abstract
Stress–birefringence measurements have been made on a number of styrene–isoprene block copolymers, and their mechanical properties have been interpreted in terms of their molecular structures. Essentially, the polymers consist of highly dispersed phases of polystyrene and polyisoprene and undergo elastic deformation with the polystyrene domains acting as crosslinks. Hysteresis measurements have been carried out to interpret the stress–strain behavior of the polymers in more detail and the conformational properties of films prepared with selective solvents have also been examined with similar birefringence techniques.