Water and methanol uptake in proton conducting Nafion ® membranes

Methanol uptake from methanol–water mixtures has been measured at ambient temperature in Nafion ®117 membranes initially saturated with water. After equilibration for 18 h the membranes were dried at 70°C in vacuum with a cold trap cooled with liquid nitrogen and the total amount of absorbent was de...

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Bibliographic Details
Published in:Solid state ionics 1997-05, Vol.97 (1), p.333-337
Main Authors: Skou, E, Kauranen, P, Hentschel, J
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Methanol
Nafion
Polymer electrolyte
Polymer industry, paints, wood
Proton conductor
Technology of polymers
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Summary:Methanol uptake from methanol–water mixtures has been measured at ambient temperature in Nafion ®117 membranes initially saturated with water. After equilibration for 18 h the membranes were dried at 70°C in vacuum with a cold trap cooled with liquid nitrogen and the total amount of absorbent was determined from the weight loss. The methanol–water ratio was determined by 1H NMR. A plot of the mole fraction of methanol in the membrane vs. the mole fraction in the water–methanol mixture was linear in the whole range from pure water to pure methanol. The slope indicated that Nafion ® does not preferentially take up either water or methanol. The number of solvent molecules was found to be 23 per sulphonic group for both methanol and water.
ISSN:0167-2738
1872-7689
DOI:10.1016/S0167-2738(97)00033-7