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Deformation mechanisms in modified polystyrene studied by high-voltage electron microscopy

Correlation between morphology and deformation behavior of general purpose polystyrene (GPPS) modified by blending with poly(styrene-b-butadiene-b-styrene) (SBS) star block copolymer based on the results from high voltage electron microscope (HVEM) is reported. It is shown that increasing volume fraction of rubber in the blends leads to enhanced ability of the samples to attain greater elongations at break indicating much more ductile behavior as compared with pure GPPS.