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Water‐sorption and transport properties of Nafion 117 H
Author(s) -
Morris David R.,
Sun Xiaodong
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070500816
Subject(s) - nafion , swelling , sorption , diffusion , water content , conductivity , humidity , anisotropy , relative humidity , chemistry , analytical chemistry (journal) , materials science , polymer chemistry , chemical engineering , thermodynamics , composite material , electrochemistry , chromatography , physics , electrode , adsorption , geotechnical engineering , quantum mechanics , engineering
The density and dimensional changes of Nafion 117 H have been measured as a function of the water content. Swelling of Nafion commences at N (≡ mol ratio water to hydrogen ion) ∼ 1.9. Some anisotropy of dimensional changes was observed. Water‐sorption isotherms obey Henry's Law with a nonzero intercept indicating some water retention. The diffusion coefficient of water in Nafion and the electrical conductivity of Nafion are strong functions of the water content. The latter is exploited for the development of a humidity sensor. © 1993 John Wiley & Sons, Inc.