Abstract
The physical and mechanical properties of polystyrene compositions, prepared by blending high impact polystyrene (HIPS) with different types of elastomer, are studied. The results obtained show a considerable increase in HIPS impact strength when modified with isoprene and butadienestyrene elastomers. This increase in impact strength is due to factors such as lowTg and the flexibility of macromolecules of the elastomer phase and adhesion at the interphase boundary. An optimal elastomer concentration of 12.5 parts per hundred of resin is observed. A multi-directional influence of the elastomer additive on the impact strength and on the tensile and flexural strength has been found, due to different mechanisms of fracture.
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