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Analysis of transient sorption and permeation in heterogeneous media
Author(s) -
Kang YongSoo,
Meldon Jerry H.,
Sung NakHo
Publication year - 1986
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.760261504
Subject(s) - permeation , sorption , polybutadiene , interphase , diffusion , materials science , fick's laws of diffusion , polystyrene , chemical engineering , styrene , phase (matter) , copolymer , thermodynamics , polymer , chemistry , organic chemistry , composite material , adsorption , membrane , biochemistry , physics , biology , engineering , genetics
Experimental data on hexane vapor sorption in phase‐segregated polybutadiene/polystyrene blends are reported, which exhibit seemingly non‐Fickian characteristics that previous workers with styrene/butadiene copolymer attributed to a diffuse interphase. These data, plus results derived from a model of sorption in heterogeneous media containing a slowly permeable dispersed phase, indicate that the mere presence of two phases with different diffusion time constants is a sufficient condition for apparently non‐Fickian overall behavior. Consequently, definitive morphological inferences cannot be drawn from such observations. In addition, results of modeling the corresponding permeation process are analogous to those obtained in an earlier study of permeation with immobilizing chemical reaction.