Abstract
AbstractPolystyrene‐block‐poly(styrene‐ran‐isoprene)‐block‐polyisoprene characterized by a morphology of spherical rubbery microdomains in a continuous polystyrene matrix is considered as a model for rubber‐toughened thermoplastics in which the volume fraction of the interfacial layer can be varied by varying the volume fraction of the interblock. Stress‐strain measurements of these systems are presented in relation to their morphology, interblock volume fraction and molecular weight of the polystyrene block. The results indicate that the energy of fracture is increased with increasing width of the interfacial layer without change of Young's modulus.
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