Abstract
The miscibility of poly(styrene- co-acrylic acid) with polymethacrylates or poly(methacrylate- co-4-vinylpyridine) was studied by differential scanning calorimetry and inverse gas chromatography using decane, octane and benzene as molecular probes. The results showed that poly(isobutyl methacrylate) is immiscible with styrene-acrylic acid copolymers of different acrylic acid content as evidenced from the appearance of two glass transition temperatures determined with both techniques. Positive values of the apparent polymer-polymer interaction parameter χ 23 (app.) obtained with all probes in the temperature range 160–180 °C over the entire blend composition confirm the immiscibility of these blends. Blends of the former styrene-acrylic acid copolymers are, however, miscible in all proportions with poly(ethyl methacrylate), poly(ethyl methacrylate- co-4-vinylpyridine) and poly(isobutyl methacrylate- co-4-vinylpyridine). A single composition dependent-glass transition temperature and negative values of χ 23 (app.) were obtained with these blends
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