The graft copolymer of ethylene–propylene–diene (5‐ethylidene‐2‐norbornene) rubber with styrene and maleic anhydride is synthesized, characterized, and blended with polystyrene. The tensile and the impact behaviors of the blends were investigated. The relative performance of EPDM‐g‐(styrene‐co‐maleic anhydride) as impact modifier for polystyrene has been evaluated.
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Shaw et al. (1990) studied this question.