Spectroscopic and thermal characterisation of the swelling behaviour of Nafion membranes in mixtures of water and methanol

A Martinez-Felipe, C.T. Imrie, A. Ribes-Greus*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)246-256
Number of pages11
JournalJournal of Applied Polymer Science
Issue number1
Early online date4 May 2012
Publication statusPublished - 5 Jan 2013

Bibliographical note

The authors thank the financial support of the Generalitat Valenciana, through the Grisolia and Forteza programs, and the Spanish Ministry of Science and Innovation, through the Research Projects ENE2007-67584-C03, UPOV08-3E-013, IT2009-0074, ENE2011-28735-C02-01 and the awarding of two FPI and FPU predoctoral grants.


  • thermal properties
  • infrared spectroscopy
  • membranes
  • angle X-ray
  • perfluorinated ionomer membranes
  • polymer electrolyte membranes
  • fuel-cells
  • perfluorosulfonate ionomer
  • diffusion
  • morphology
  • scattering
  • sorption
  • swollen


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