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Dynamic sorption and transport of water vapor in dense polyimide membranes
Author(s) -
Zeng Chuyi,
Li Jiding,
Chen Tianquan,
Chen Jian,
Chen Cuixian
Publication year - 2006
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.24265
Subject(s) - polyimide , sorption , pyromellitic dianhydride , membrane , diffusion , thermodynamics , gravimetric analysis , polymer chemistry , materials science , fick's laws of diffusion , chemistry , analytical chemistry (journal) , organic chemistry , composite material , adsorption , layer (electronics) , physics , biochemistry
Series of polyimide membranes were synthesized using varied monomers such as pyromellitic dianhydride, 3,3′4,4′‐benzophenonetetracarboxylic dianhydride, 4,4′‐diaminodiphenylether, 4,4′‐diaminodiphenylmethane, and phenylenediamine, and the properties of polyimide membranes were measured by experimental techniques. The dynamic sorption and transport processes of water vapor in those dense polyimide membranes were measured using computer on‐line recorded gravimetric sorption method at 298.15 and 308.15 K. Modeling of these processes involved the total change of excess Gibbs free energy, which was considered as a sum of three parts calculated by the modified Scatchard‐Hildebrand model, Flory‐Huggins theory, and linear viscoelastic theory, respectively. The calculated results were in agreement with the experimental data and the maximal relative deviation was no more than 8.57% and the average relative deviation is 4.62%. The calculated results had also shown that this model describe not only Fickian diffusion but also non‐Fickian very well. Furthermore, the influence of chemical structure, morphological structure, etc. of polyimide membranes on the water sorption concentration and water diffusion coefficient were interpreted by considering the experimental data and calculation results. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 2189–2198, 2006