The crystalline-amorphous polymer pair of poly(viny1idene fluoride) and poly(methy1 methacrylate) is known to be miscible over a wide composition range. The effects of ionic moieties on the miscibility were studied by replacing the poly(methy1 methacrylate) with a series of random copolymers of methyl methacrylate and potassium salt of methacrylic acid. The interaction parameter
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