Abstract
Heat evolution from and mechanical work done on films of a styrene–butadiene–styrene (SBS) triblock copolymer were investigated under tensile strain. The relationship between microphase structure and thermomechanical behavior was examined on SBS films having lamellar, cylindrical, and spherical morphology which were cast from solutions in three mixed solvents. For SBS films having lamellar and cylindrical morphology, the enthalpy changes due to the plastic-to-rubber transition were found to be 0.24 and 0.17J cm−3, respectively. These values correspond to the enthalpy required for irreversible destruction of the polystyrene domains. On the other hand, an SBS film having spherical polystyrene domains exhibited behavior similar to that of a vulcanized rubber.
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