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Sorption and transport of water vapor in glassy poly(acrylonitrile)
Author(s) -
Stannett V.,
Haider M.,
Koros W. J.,
Hopfenberg H. B.
Publication year - 1980
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760200414
Subject(s) - sorption , permeation , acrylonitrile , materials science , penetrant (biochemical) , vapor pressure , water vapor , polymer , diffusion , thermodynamics , fick's laws of diffusion , analytical chemistry (journal) , chemistry , copolymer , chromatography , organic chemistry , composite material , membrane , adsorption , biochemistry , physics
Sorption data for H 2 O in glassy poly(acrylonitrile)(PAN) are presented for a range of relative vapor pressures at temperatures from 20 to 50°C. Simple dual mode sorption, involving “hole‐filling” and molecular solution appears to dominate the low activity region of sorption. Based on the clustering analysis suggested by Zimm and Lundberg, pronounced clustering of penetrant appears to occur above a relative pressure of 0.6. The form of the effective concentration‐dependent diffusion coefficient for H 2 O in PAN, determined by analysis of steady state permeation data, suggests that water in the microvoids and clusters has a lower mobility than the molecularly dissolved water in the polymer matrix. Time lag measurements at high upstream relative water vapor pressures suggest that the transient state permeation has a non‐Fickian character due to relaxations which occur slowly to accommodate the clustering process.