AbstractThe compatibility of blends of poly(vinyl chloride) (PVC) and styrene copolymers containing maleic anhydride have been investigated by thermal and dynamic and mechanical studies. Unlike homopolymer polystyrene, these styrene/maleic anhydride copolymers, when blended with PVC, provide a degree of miscibility. Complete miscibility or single phase morphology is present only at low concentrations. At higher concentrations, the alloy system separates into two altered phases—neither of which is a pure component. At intermediate alloy compositions, the phases are relatively constant in polymer composition, but the ratio of phases can vary. These altered phases are dispersed at extreme concentrations and are cocontinuous at levels approaching approximately 60 wt PVC. The intermixed, altered phases show various degrees of miscibility and provide significant adhesion between the two phases. Physical property improvements are attributable to the partial miscibility of the phase
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