Interpolymer interactions and miscibility in poly(n-butyl methacrylate-co-methacrylic acid)/poly(styrene-co-N,N-dimethyl acrylamide) blends

Authors

  • Assia Siham Hadj-Hamou,

    1. Laboratory of Polymer Materials, Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32, El Alia, Algiers, 16111, Algeria
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  • Said Djadoun

    Corresponding author
    1. Laboratory of Polymer Materials, Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32, El Alia, Algiers, 16111, Algeria
    • Laboratory of Polymer Materials, Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32, El Alia, Algiers, 16111, Algeria
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Abstract

The miscibility of poly(n-butyl methacrylate-co-methacrylic acid) containing 18 mol % methacrylic acid (BMAM-18) and poly(styrene-co-N,N-dimethyl acrylamide) containing 17 mol % N,N-dimethyl acrylamide (SAD-17) was investigated with viscometry, differential scanning calorimetry (DSC), and Fourier transform infrared (FTIR) spectroscopy. The DSC analysis showed a single glass-transition temperature for all the blends, indicating that these copolymers were miscible over the entire composition range. The glass-transition temperatures of these blends were higher than those calculated with the additivity rule. This was characteristic of the presence of specific interactions. The interactions between BMAM-18 and the tertiary amide of SAD-17 were studied with FTIR spectroscopy, which revealed that hydrogen-bonding interactions occurred between the hydroxyl groups of BMAM-18 and the carbonyl amide of SAD-17. A new band characterizing these interactions appeared around 1613 cm−1. The quantitative results showed that the fraction of the associated amide increased with an increase in the amount of the acidic BMAM-18 copolymer. Although BMAM-18 and SAD-17 led to homogeneous solutions in butan-2-one, as the concentration of N,N-dimethyl acrylamide increased to 32 mol % [as within the poly(styrene-co-N,N-dimethyl acrylamide) containing 32 mol % N,N-dimethyl acrylamide], complexation occurred when this latter compound was mixed with BMAM-18 in butan-2-one. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2717–2724, 2006

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