Abstract
Among the commonest types of polymer composites are the impact polystyrenes (IPS) and the related ABS plastics [1, 21. Structurally they are granular composites with a glassy matrix (polystyrene in IPS and SAN copotymer in ABS plastics). The shape of the inclusions is almost spherical. Strong contact at the phase interfaces is achieved by chemical grafting of the polystyrene or SAN macromolecules to the rubber. The elastomeric phase inclusions in the IPS contain polystyrene occlusions in the form of very small granules with interlayers of rubber between them. In ABS plastics the elastomeric phase inclusions are smaller in size than in IPS (up to 1 t~m), and under the electron microscope the SAN occlusions within the inclusions are less clearly distinguishable [1 ]. At the same time, it may be assumed that the elastomeric phase of the ABS plastic also contains a significant amount of matrix material, i.e., SAN, since grafting prevents the complete segregation of the components.
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