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Gas transport properties of polyaniline membranes
Author(s) -
Chang MinJong,
Liao YunHsin,
Myerson Allan S.,
Kwei T. K.
Publication year - 1996
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/(sici)1097-4628(19961128)62:9<1427::aid-app12>3.0.co;2-w
Subject(s) - solubility , polyaniline , diffusion , membrane , solvent , gaseous diffusion , molecule , gas separation , doping , boiling , analytical chemistry (journal) , permeability (electromagnetism) , materials science , boiling point , chemistry , chemical engineering , thermodynamics , polymer , organic chemistry , biochemistry , engineering , polymerization , physics , optoelectronics , electrode
The transport properties of He, H 2 , CO 2 , O 2 , N 2 , and CH 4 gases in solvent cast, HCl doped, and undoped polyaniline (PANi) membranes were determined. Measurements were carried out at 40 psi pressure from 19°C to 60°C. An excellent correlation was found between the diffusion coefficients and the molecular diameters of gases. The solubility coefficients of gases were found to correlate with their boiling points or critical temperatures. The sepa‐ration factors for CO 2 /N 2 and CO 2 /CH 4 are dominated by the high solubility of CO 2 . These correlations enable us to predict the permeability, diffusion, and solubility coefficients of other gases. After the doping‐undoping process, the fluxes of gases with kinetic diameters smaller than 3.5 Å increased but those of larger gases decreased. This results in a higher separation factor for a gas pair involving a small gas molecule and a larger one. © 1996 John Wiley & Sons, Inc.