Abstract
The miscibility behaviour of poly( N, N-dimethylacrylamide) (PDMA), with poly(ethylene-co-vinyl alcohol) (EVAL) of different compositions has been investigated and compared to that of the blends with poly(vinyl acetate-co-vinyl alcohol) (ACAL). Differential Scanning Calorimetry (DSC) results indicate that PDMA is miscible with EVAL78, EVAL68 and EVAL56 but immiscible with EVAL25, which has lower degree of hydrolysis. The limit of miscibility is lower in this case, indicating the influence of the vinyl alcohol content in miscibility. Fourier transformed infrared spectroscopy (FTIR) studies of miscible blends reveal the existence of specific interactions by hydrogen bonding between hydroxyl groups in vinyl alcohol units of the copolymers and the amide-carbonyl group in the PDMA, which appear to be decisive for miscibility.
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