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Miscibility and complexation behavior in poly(ethyl methacrylate)/poly(styrene-co-methacrylic acid), poly[2-(N,N-dimethylamino) ethyl methacrylate]/poly(styrene-co-methacrylic acid), and poly{styrene-co-[2-(N,N-dimethyl amino) ethyl methacrylate]}/poly(styrene-co-methacrylic acid) systems

Authors

  • N. Abdellaoui,

    1. Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32, Elalia, Algiers, Algeria
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  • S. Djadoun

    Corresponding author
    1. Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32, Elalia, Algiers, Algeria
    • Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene, BP 32, Elalia, Algiers, Algeria
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Abstract

This contribution presents a study of the hydrogen-bonding interactions between poly(styrene-co-methacrylic acid) containing 22 mol % methacrylic acid (SMA-22) and poly(ethyl methacrylate) (PEMA), poly[2-(N,N-dimethylamino) ethyl methacrylate] (PMAD), or poly{styrene-co-[2-(N,N-dimethylamino) ethyl methacrylate]} containing 3, 12, or 21 mol % 2-(N,N-dimethylamino) ethyl methacrylate (SMAD-3, SMAD-12, or SMAD-21) by viscometry and differential scanning calorimetry (DSC). On the basis of the analysis of DSC thermograms and viscometric measurements, polymer miscibility was observed with the PEMA/SMA-22 system. This miscibility was due to hydrogen-bonding specific interactions between carbonyl groups of PEMA and carboxylic groups of SMA-22. The SMAD-3/SMA-22 system was immiscible, whereas complexation was observed with PMAD/SMA-22, SMAD-21/SMA-22, and SMAD-12/SMA-22 mixtures in butan-2-one. This complexation was due to stronger interactions between poly(styrene-co-methacrylic acid) and the 2-(N,N-dimethylamino) ethyl methacrylate groups of PMAD or SMAD copolymers, as evidenced by viscometry and DSC. A similar phenomenon was observed for PMAD/SMA-22 and SMAD-21/SMA-22 mixtures in tetrahydrofuran. For the SMAD-12/SMA-22 system in this solvent, such behavior was noted only in the presence of an excess of the copolymer SMAD-12. This study showed that the minimum amount of interacting species required for the interpolymer complexation was higher in tetrahydrofuran than in butan-2-one. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 658–664, 2005

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