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Sorption and transport studies of water in Kapton polymide. I
Author(s) -
Yang D. K.,
Koros W. J.,
Hopfenberg H. B.,
Stannett V. T.
Publication year - 1985
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.1985.070300313
Subject(s) - sorption , kapton , penetrant (biochemical) , diffusion , activation energy , thermodynamics , polyimide , enthalpy , dilution , materials science , water vapor , humidity , analytical chemistry (journal) , polymer chemistry , chemistry , organic chemistry , composite material , physics , adsorption , layer (electronics)
Sorption isotherms and diffusion coefficients of water in a 0.3‐mil Kapton polyimide film at 30, 45, and 60°C are reported. The data are well described by the dual mode sorption and transport models at low activities. At high penetrant activities, clustering of water is suggested by a Zimm–Lundberg analysis of the sorption data and the fact that the diffusion coefficient for water decreases with increasing external vapor activity. The effect of temperature on the diffusion coefficients at infinite dilution and the dual mode sorption parameters k D , b , and C H ′are presented and discussed. The magnitude of the activation energy of the diffusion coefficient at infinite dilution, 5.4 kcal/mol, is smaller than the corresponding activation energy in more flexible chain polymers, perhaps suggesting that rather small backbone motions are associated with diffusion of water through the Kapton matrix. The predictions for the isosteric enthalpy of sorption from the dual mode model are presented and compared with the values determined from graphical analysis of the sorption isotherms performed independently without reference to the dual mode sorption model.