H2N2V1, Main, Exploration, bibRecord, 002026

Gas transport through homogeneous and asymmetric polyestercarbonate membranes

Identifieur interne : 002026 ( Main/Exploration ); précédent : 002025; suivant : 002027

Gas transport through homogeneous and asymmetric polyestercarbonate membranes

Auteurs : Ingo Pinnau [États-Unis] ; Mark W. Hellums [États-Unis] ; William J. Koros [États-Unis]

Source :

Polymer [ 0032-3861 ] ; 1991.

RBID : ISTEX:F424E8F1C7132FB57F829D5CED193CA6DF4D1133

English descriptors

Teeft :
- Activation energies, Activation energy, Ageing phenomena, Arrhenius behaviour, Asymmetric, Asymmetric membrane, Asymmetric membrane properties, Asymmetric membrane samples, Asymmetric membrane skin, Asymmetric membranes, Asymmetric polysulphone membranes, Asymmetric samples, Bulk membrane material, Cage volume, Cohesive energy density, Dense film, Dense films, Effective skin layer thicknesses, Effective skin thickness, Energy density, Free volume, Fritzsche, Glass plate, Glassy polymers, Higher activation energies, Higher permselectivities, Homogeneous films, Koros, Membrane, Membrane samples, Methylene chloride, Other hand, Permeability, Permeability coefficient, Permeability coefficients, Permeation, Permselectivities, Phase inversion process, Pinnau, Polym, Polymer, Skin layer, Skin layers, Solubility, Solution cast, Sorption, Temperature range, Transport properties, Vacuum oven, Various gases.

Abstract

Abstract: Permeabilities, solubilities and diffusivities of N2, O2, CO2 and H2 are reported for a polyestercarbonate at 35°C and 4.4 atm. Constant activation energies of permeation were determined for dense films and defect-free asymmetric polyestercarbonate membranes over a temperature range of 25–55°C. Activation energies of permeation were 10 and 20% higher for N2 and O2, respectively, in the asymmetric membrane samples as compared to the dense films. Permselectivities for the gas pairs O2N2, H2N2 and CO2N2 were found to be higher in the asymmetric membranes compared to those of the dense films. The detailed cause of the higher permselectivities and activation energies in the asymmetric membranes is currently not known. Possible orientation-induced increases in segmental packing density in the asymmetric membrane skin is discussed as a potential explanation for the differences between the asymmetric and dense films.

Url:

https://api.istex.fr/ark:/67375/6H6-W481H7RL-N/fulltext.pdf

DOI: 10.1016/0032-3861(91)90342-G

Affiliations:

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Le document en format XML

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<term>Activation energy</term>
<term>Ageing phenomena</term>
<term>Arrhenius behaviour</term>
<term>Asymmetric</term>
<term>Asymmetric membrane</term>
<term>Asymmetric membrane properties</term>
<term>Asymmetric membrane samples</term>
<term>Asymmetric membrane skin</term>
<term>Asymmetric membranes</term>
<term>Asymmetric polysulphone membranes</term>
<term>Asymmetric samples</term>
<term>Bulk membrane material</term>
<term>Cage volume</term>
<term>Cohesive energy density</term>
<term>Dense film</term>
<term>Dense films</term>
<term>Effective skin layer thicknesses</term>
<term>Effective skin thickness</term>
<term>Energy density</term>
<term>Free volume</term>
<term>Fritzsche</term>
<term>Glass plate</term>
<term>Glassy polymers</term>
<term>Higher activation energies</term>
<term>Higher permselectivities</term>
<term>Homogeneous films</term>
<term>Koros</term>
<term>Membrane</term>
<term>Membrane samples</term>
<term>Methylene chloride</term>
<term>Other hand</term>
<term>Permeability</term>
<term>Permeability coefficient</term>
<term>Permeability coefficients</term>
<term>Permeation</term>
<term>Permselectivities</term>
<term>Phase inversion process</term>
<term>Pinnau</term>
<term>Polym</term>
<term>Polymer</term>
<term>Skin layer</term>
<term>Skin layers</term>
<term>Solubility</term>
<term>Solution cast</term>
<term>Sorption</term>
<term>Temperature range</term>
<term>Transport properties</term>
<term>Vacuum oven</term>
<term>Various gases</term>
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<front><div type="abstract" xml:lang="en">Abstract: Permeabilities, solubilities and diffusivities of N2, O2, CO2 and H2 are reported for a polyestercarbonate at 35°C and 4.4 atm. Constant activation energies of permeation were determined for dense films and defect-free asymmetric polyestercarbonate membranes over a temperature range of 25–55°C. Activation energies of permeation were 10 and 20% higher for N2 and O2, respectively, in the asymmetric membrane samples as compared to the dense films. Permselectivities for the gas pairs O2N2, H2N2 and CO2N2 were found to be higher in the asymmetric membranes compared to those of the dense films. The detailed cause of the higher permselectivities and activation energies in the asymmetric membranes is currently not known. Possible orientation-induced increases in segmental packing density in the asymmetric membrane skin is discussed as a potential explanation for the differences between the asymmetric and dense films.</div>
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Gas transport through homogeneous and asymmetric polyestercarbonate membranes

Gas transport through homogeneous and asymmetric polyestercarbonate membranes

Source :

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

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Pour mettre un lien sur cette page dans le réseau Wicri