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Gas transport in ring substituted polyanilines
Author(s) -
Chang MinJong,
Myerson Allan S.,
Kwei T. K.
Publication year - 1997
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.11729
Subject(s) - substituent , benzene , materials science , solubility , alkoxy group , polyaniline , ring (chemistry) , diffusion , boiling , thermal diffusivity , gaseous diffusion , permeability (electromagnetism) , analytical chemistry (journal) , thermodynamics , chemistry , organic chemistry , polymer , alkyl , composite material , membrane , biochemistry , physics , electrode , polymerization
The gas transport properties of polymethoxyaniline (PMANi) and polyethoxyaniline (PEANi), in which the methoxy and ethoxy groups were introduced onto the benzene rings at the ortho position, were studied to determine the effect of substituents. Measurements were carried out at 40 psi from 25°C to 55°C. When compared with polyaniline, the gas permeability increases with the size of substituent because of the increases in the diffusivities while the selectivities remain the same or increase for some gas pairs. Excellent correlations were found between the diffusion coefficients and the molecular diameters of gases and between the solubility coefficients of gases and their boiling points (or critical temperatures).