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Polycarbonate (PC) and poly(vinylidene fluoride) (PVDF) are immiscible, which accounts for a very weak interfacial adhesion, and a high interfacial tension. This situation may be changed by the addition of poly(methyl methacrylate) (PMMA), which concentrates preferably in the PVDF rich phase, but also at the PVDF/PC interface. The compatibilizing effect of PMMA in PC/PVDF blends has been studied in reference to the interfacial adhesion, the mechanical properties, the interfacial tension, and the phase morphology. The interfacial tension between molten PC and PVDF/PMMA preblends significantly decreases when the PMMA content in PVDF exceeds 40 wt %. In parallel, the blends morphology is becoming more homogeneous and finer. The PC/PVDF interfacial adhesion is also steadily improved by the premixing of PVDF with increasing amounts of PMMA, which is more likely at the origin of improved mechanical properties.