Get access

Spectroscopic and thermal characterization of the swelling behavior of nafion membranes in mixtures of water and methanol

Authors

  • A. Martinez-Felipe,

    1. Institute of Materials Technology, Universitat Politécnica de Valéncia, Camino de Vera s/n, 46022, Valencia, Spain
    Search for more papers by this author
  • C. T. Imrie,

    1. Department of Chemistry, School of Natural and Computing Sciences, Meston Building, University of Aberdeen, Aberdeen, AB24 3UE, Scotland, United Kingdom
    Search for more papers by this author
  • A. Ribes-Greus

    Corresponding author
    1. Institute of Materials Technology, Universitat Politécnica de Valéncia, Camino de Vera s/n, 46022, Valencia, Spain
    • Institute of Materials Technology, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022, Valencia, Spain
    Search for more papers by this author

Abstract

The spectroscopic and thermal properties of swollen Nafion membranes in methanol aqueous mixtures were investigated to understand the behavior of commercial electrolytes in the presence of polar solvents. Several differences were observed in the absorption processes depending on the composition of the solvent. Deconvolution methods were applied to study specific contributions of solvents and polymer groups based on Fourier transform infrared spectroscopy and thermogravimetric analysis. The results evidence compositional effects on the interactions between solvents and Nafion. A major influence of the nonpolar domains (hydrophobic regions) in the absorption of methanol together with a reduction of the interactions with sulfonate groups was observed. Such changes are accompanied by a modification of the cluster morphology of the equilibrated membranes evaluated by differential scanning calorimetry. These findings can be useful to improve the knowledge on Nafion's microstructure in the presence of polar solvents. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Get access to the full text of this article

Ancillary