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ABSTRACT:The complexation behavior between poly-(styrene-co-methacrylic acid) of different compositions (SMA-12 or SMA-29) and poly(styrene-co-4-vinylpyridine) (S4VP-6 or S4VP-15) was studied by viscometry and differential scanning calorimetry using tetrahydrofuran (THF) and butan-2-one as solvents. This complexation is attributed to the presence of strong intermolecular interactions between the different polymer chains by hydrogen bonding. A single glass-transition temperature, intermediate between those of the two pure copolymers SMA-29 and S4VP-15, was obtained with each composition of the mixture when THF or butan-2-one is used as a common solvent. The obtained results showed that the formation of such complexes depends strongly on the nature of the solvent and the contents of the interacting species. The complex formation is inhibited in THF because of the important ability of this latter to interact with the SMA. A quantitative analysis of the interactions between the constituents of these blends was carried out by FTIR spectroscopy.

The miscibility of blends of copolymers of different compositions of butyl methacrylate‐co‐methacrylic acid or styrene‐co‐methacrylic acid with styrene‐co‐4‐vinylpyridine or butyl methacrylate‐co‐4‐vinylpyridine was studied by differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. It was found that these blends were miscible in part as a result of specific favorable interactions between the carboxylic acid and pyridine groups within the polymer chains. Evidence of such interactions was obtained from the single composition‐dependent glass transition temperature and the FTIR results.

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