The effects of styrene-ethylene/propylene (SEP) diblock copolymer on the morphology and mechanical properties of polypropylene/polystyrene (PP/PS) blends were investigated. The results showed that SEP diblock eopolymer, acting as a compatibilizer in PP/PS immiscible blends, can diminish the coalescence of the dispersed particles, reduce their average particle size, change their phase morphologies significantly, and increase the mechanical properties. It was found that SEP has better compatibilization effects on the PP/PS (20/80) blends.
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