Solubility and transport behavior of water and alcohols in Nafion

Sorption isotherms, concentration dependent diffusion coefficients and immersion solubilities were determined for water and three alcohols (methanol, ethanol, propanol) at 32\0\C in acid-form Nafion films. Apparent diffusion coefficients for water from vapour sorption kinetics exhibit a maximum at l...

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Bibliographic Details
Published in:Polymer (Guilford) 2001, Vol.42 (2), p.623-635
Main Authors: RIVIN, D, KENDRICK, C. E, GIBSON, P. W, SCHNEIDER, N. S
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
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Summary:Sorption isotherms, concentration dependent diffusion coefficients and immersion solubilities were determined for water and three alcohols (methanol, ethanol, propanol) at 32\0\C in acid-form Nafion films. Apparent diffusion coefficients for water from vapour sorption kinetics exhibit a maximum at low concentrations, are higher for desorption than sorption and are below the reported immersion value. This anomalous behaviour is attributed to nonisotherinal conditions arising from the heat of condensation of water vapour and the time-dependent volume response to changes in vapour concentration, as well as, mass transfer limitations. (Original abstract - amended)
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(00)00350-5