Abstract

An emulsification curve which tracks the change in dispersed phase size with interfacial modifier concentration and a fracture mechanics approach have been used to study the behavior of a variety of well-defined interfacial modifiers for a melt-processed ethylene−propylene rubber (EPR)/polystyrene (PS) blend. In this study two poly(styrene/ethylene−butylene) (SEB) diblock copolymers and a poly(styrene/ethylene−propylene) (SEP) diblock copolymer were compared. All of the above interfacial modifiers demonstrate an excellent emulsification efficacy for the EPR/PS system, and no effect was observed when changing the block structure from ethylene−butylene to ethylene−propylene. Despite the excellent capacity of all three diblock modifiers to emulsify the blend, the Charpy and notched and unnotched Izod impact testing demonstrate significantly different behaviors for the various copolymers. The higher molecular weight SEB (Mn = 187 000) and SEP (Mn = 140 000) interfacial modifiers displayed a brittle fracture b...

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