Sorption and diffusion of solvent vapours in poly(vinylalcohol) membranes of different crystallinity degrees
Identifieur interne : 000A16 ( Istex/Curation ); précédent : 000A15; suivant : 000A17Sorption and diffusion of solvent vapours in poly(vinylalcohol) membranes of different crystallinity degrees
Auteurs : Laurent Perrin [France] ; Quang Trong Nguyen [France] ; Robert Clement [France] ; Jean Neel [France]Source :
- Polymer International [ 0959-8103 ] ; 1996-03.
Descripteurs français
English descriptors
- KwdEn :
- Amorphous phase, Average diffusion coefficient, Clear explanation, Coefficient, Concentration range, Constant diffusion coefficient, Crystalline domains, Crystalline regions, Crystallinity, Crystallinity degree, Crystallinity degrees, Crystallinity sample, Density gradient column, Different crystallinity degrees, Different water activities, Diffusion characteristics, Diffusion coefficient, Diffusion coefficient increases, Diffusion coefficients, Diffusion properties, Diffusivity, Equilibrium state, Ethanol, Ethanol vapours, Experimental data, Experimental kinetics, Experimental ones, Experimental points, Experimental sorption kinetics, Exponential relationship, Film thickness, First term, Flory, Flory equation, Flory model, Interaction parameter, Isotherm, John wiley, Kinetics, Large range, Limit diffusion coefficient, Limit diffusivity, Local concentration, Local penetrant concentration, Mass gain, Membrane, Membrane processes, Other hand, Penetrant, Penetrant diffusion, Plane surfaces, Plasticization, Plasticization coefficient, Polym, Polymer, Polymer film, Polymer materials, Polymer properties, Polymer segments, Residual errors, Same temperature, Second fick equation, Semicrystalline polymer, Solubility, Solubility parameter space, Solvent, Solvent content, Solvent sorption, Solvent vapour activity, Solvent vapour pressure, Solvent vapours, Solvent volume fraction, Sorption, Sorption behaviour, Sorption chamber, Sorption data, Sorption equilibrium, Sorption experiments, Sorption extent, Sorption isotherm, Sorption isotherms, Sorption kinetics, Sorption kinetics data, Sorption microbalance, Sorption process, Sorption time, Vapour, Vapours, Volume fraction, Water activities, Water activity, Water vapour, Weight gain, Weight gains, Whole sorption kinetics.
- Teeft :
- Amorphous phase, Average diffusion coefficient, Clear explanation, Coefficient, Concentration range, Constant diffusion coefficient, Crystalline domains, Crystalline regions, Crystallinity, Crystallinity degree, Crystallinity degrees, Crystallinity sample, Density gradient column, Different crystallinity degrees, Different water activities, Diffusion characteristics, Diffusion coefficient, Diffusion coefficient increases, Diffusion coefficients, Diffusion properties, Diffusivity, Equilibrium state, Ethanol, Ethanol vapours, Experimental data, Experimental kinetics, Experimental ones, Experimental points, Experimental sorption kinetics, Exponential relationship, Film thickness, First term, Flory, Flory equation, Flory model, Interaction parameter, Isotherm, John wiley, Kinetics, Large range, Limit diffusion coefficient, Limit diffusivity, Local concentration, Local penetrant concentration, Mass gain, Membrane, Membrane processes, Other hand, Penetrant, Penetrant diffusion, Plane surfaces, Plasticization, Plasticization coefficient, Polym, Polymer, Polymer film, Polymer materials, Polymer properties, Polymer segments, Residual errors, Same temperature, Second fick equation, Semicrystalline polymer, Solubility, Solubility parameter space, Solvent, Solvent content, Solvent sorption, Solvent vapour activity, Solvent vapour pressure, Solvent vapours, Solvent volume fraction, Sorption, Sorption behaviour, Sorption chamber, Sorption data, Sorption equilibrium, Sorption experiments, Sorption extent, Sorption isotherm, Sorption isotherms, Sorption kinetics, Sorption kinetics data, Sorption microbalance, Sorption process, Sorption time, Vapour, Vapours, Volume fraction, Water activities, Water activity, Water vapour, Weight gain, Weight gains, Whole sorption kinetics.
Abstract
Solvent sorption and diffusion are the key processes that control membrane performances in membrane processes. The sorption characteristic of water and ethanol vapours in poly(vinylalcohol) (PVA) membranes of different crystallinity degrees was measured by microgravimetry and the diffusion characteristic was calculated from the sorption kinetics at different water activities by curve fitting. The sorption isotherms for water vapour in membranes of 28, 37, 44 and 56% crystallinity degrees at 40°C obey the Flory equation based on the polymer lattice model. When the sorption extent was corrected by assuming that only the polymer amorphous phase is accessible to the penetrant, a unique Flory χ interaction parameter, 0.3, was obtained for all samples except for the 28% crystallinity sample. For the latter sample, the lower χ value (0.18) obtained can be explained by a change in the sorption behaviour of the original crystalline domains which may undergo partial destruction. The diffusion coefficient increases with the average water content in the membrane according to an exponential relationship characterized by a limit diffusion coefficient and a plasticization coefficient. The higher the crystallinity of the membrane, the lower the values of the limit diffusion coefficient and the plasticization coefficient. The ethanol sorption was also well described by the Flory–Huggins equation. The limit diffusion coefficient for water was two orders of magnitude larger than that for ethanol.
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DOI: 10.1002/(SICI)1097-0126(199603)39:3<251::AID-PI496>3.0.CO;2-W
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sortKey="Nguyen, Quang Trong" sort="Nguyen, Quang Trong" uniqKey="Nguyen Q" first="Quang Trong" last="Nguyen">Quang Trong Nguyen</name><affiliation wicri:level="1"><mods:affiliation>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy</wicri:regionArea></affiliation></author><author><name sortKey="Clement, Robert" sort="Clement, Robert" uniqKey="Clement R" first="Robert" last="Clement">Robert Clement</name><affiliation wicri:level="1"><mods:affiliation>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy</wicri:regionArea></affiliation></author><author><name sortKey="Neel, Jean" sort="Neel, Jean" uniqKey="Neel J" first="Jean" last="Neel">Jean Neel</name><affiliation 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poly(vinylalcohol) membranes of different crystallinity degrees</title><author><name sortKey="Perrin, Laurent" sort="Perrin, Laurent" uniqKey="Perrin L" first="Laurent" last="Perrin">Laurent Perrin</name><affiliation wicri:level="1"><mods:affiliation>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy</wicri:regionArea></affiliation><affiliation wicri:level="1"><mods:affiliation>Correspondence address: LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>Correspondence address: LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy</wicri:regionArea></affiliation></author><author><name sortKey="Nguyen, Quang Trong" sort="Nguyen, Quang Trong" uniqKey="Nguyen Q" first="Quang Trong" last="Nguyen">Quang Trong Nguyen</name><affiliation wicri:level="1"><mods:affiliation>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy</wicri:regionArea></affiliation></author><author><name sortKey="Clement, Robert" sort="Clement, Robert" uniqKey="Clement R" first="Robert" last="Clement">Robert Clement</name><affiliation wicri:level="1"><mods:affiliation>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy</wicri:regionArea></affiliation></author><author><name sortKey="Neel, Jean" sort="Neel, Jean" uniqKey="Neel J" first="Jean" last="Neel">Jean Neel</name><affiliation wicri:level="1"><mods:affiliation>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy, France</mods:affiliation><country xml:lang="fr">France</country><wicri:regionArea>LCPM‐URA 494, ENSIC, B.P. 451, 1 rue Grandville, 54001 Nancy</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Polymer International</title><title level="j" type="alt">POLYMER INTERNATIONAL</title><idno type="ISSN">0959-8103</idno><idno type="eISSN">1097-0126</idno><imprint><biblScope unit="vol">39</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="251">251</biblScope><biblScope unit="page" to="260">260</biblScope><biblScope unit="page-count">10</biblScope><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="1996-03">1996-03</date></imprint><idno type="ISSN">0959-8103</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0959-8103</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Amorphous phase</term><term>Average diffusion coefficient</term><term>Clear explanation</term><term>Coefficient</term><term>Concentration range</term><term>Constant diffusion coefficient</term><term>Crystalline domains</term><term>Crystalline regions</term><term>Crystallinity</term><term>Crystallinity degree</term><term>Crystallinity degrees</term><term>Crystallinity sample</term><term>Density gradient column</term><term>Different crystallinity degrees</term><term>Different water activities</term><term>Diffusion characteristics</term><term>Diffusion coefficient</term><term>Diffusion coefficient increases</term><term>Diffusion coefficients</term><term>Diffusion properties</term><term>Diffusivity</term><term>Equilibrium state</term><term>Ethanol</term><term>Ethanol vapours</term><term>Experimental data</term><term>Experimental kinetics</term><term>Experimental ones</term><term>Experimental points</term><term>Experimental sorption kinetics</term><term>Exponential relationship</term><term>Film thickness</term><term>First term</term><term>Flory</term><term>Flory equation</term><term>Flory model</term><term>Interaction parameter</term><term>Isotherm</term><term>John wiley</term><term>Kinetics</term><term>Large range</term><term>Limit diffusion coefficient</term><term>Limit diffusivity</term><term>Local concentration</term><term>Local penetrant concentration</term><term>Mass gain</term><term>Membrane</term><term>Membrane processes</term><term>Other hand</term><term>Penetrant</term><term>Penetrant diffusion</term><term>Plane surfaces</term><term>Plasticization</term><term>Plasticization coefficient</term><term>Polym</term><term>Polymer</term><term>Polymer film</term><term>Polymer materials</term><term>Polymer properties</term><term>Polymer segments</term><term>Residual errors</term><term>Same temperature</term><term>Second fick equation</term><term>Semicrystalline polymer</term><term>Solubility</term><term>Solubility parameter space</term><term>Solvent</term><term>Solvent content</term><term>Solvent sorption</term><term>Solvent vapour activity</term><term>Solvent vapour pressure</term><term>Solvent vapours</term><term>Solvent volume fraction</term><term>Sorption</term><term>Sorption behaviour</term><term>Sorption chamber</term><term>Sorption data</term><term>Sorption equilibrium</term><term>Sorption experiments</term><term>Sorption extent</term><term>Sorption isotherm</term><term>Sorption isotherms</term><term>Sorption kinetics</term><term>Sorption kinetics data</term><term>Sorption microbalance</term><term>Sorption process</term><term>Sorption time</term><term>Vapour</term><term>Vapours</term><term>Volume fraction</term><term>Water activities</term><term>Water activity</term><term>Water vapour</term><term>Weight gain</term><term>Weight gains</term><term>Whole sorption kinetics</term></keywords><keywords scheme="Teeft" xml:lang="en"><term>Amorphous phase</term><term>Average diffusion coefficient</term><term>Clear explanation</term><term>Coefficient</term><term>Concentration range</term><term>Constant diffusion coefficient</term><term>Crystalline domains</term><term>Crystalline regions</term><term>Crystallinity</term><term>Crystallinity degree</term><term>Crystallinity degrees</term><term>Crystallinity sample</term><term>Density gradient column</term><term>Different crystallinity degrees</term><term>Different water activities</term><term>Diffusion characteristics</term><term>Diffusion coefficient</term><term>Diffusion coefficient increases</term><term>Diffusion coefficients</term><term>Diffusion properties</term><term>Diffusivity</term><term>Equilibrium state</term><term>Ethanol</term><term>Ethanol vapours</term><term>Experimental data</term><term>Experimental kinetics</term><term>Experimental ones</term><term>Experimental points</term><term>Experimental sorption kinetics</term><term>Exponential relationship</term><term>Film thickness</term><term>First term</term><term>Flory</term><term>Flory equation</term><term>Flory model</term><term>Interaction parameter</term><term>Isotherm</term><term>John wiley</term><term>Kinetics</term><term>Large range</term><term>Limit diffusion coefficient</term><term>Limit diffusivity</term><term>Local concentration</term><term>Local penetrant concentration</term><term>Mass gain</term><term>Membrane</term><term>Membrane processes</term><term>Other hand</term><term>Penetrant</term><term>Penetrant diffusion</term><term>Plane surfaces</term><term>Plasticization</term><term>Plasticization coefficient</term><term>Polym</term><term>Polymer</term><term>Polymer film</term><term>Polymer materials</term><term>Polymer properties</term><term>Polymer segments</term><term>Residual errors</term><term>Same temperature</term><term>Second fick equation</term><term>Semicrystalline polymer</term><term>Solubility</term><term>Solubility parameter space</term><term>Solvent</term><term>Solvent content</term><term>Solvent sorption</term><term>Solvent vapour activity</term><term>Solvent vapour pressure</term><term>Solvent vapours</term><term>Solvent volume fraction</term><term>Sorption</term><term>Sorption behaviour</term><term>Sorption chamber</term><term>Sorption data</term><term>Sorption equilibrium</term><term>Sorption experiments</term><term>Sorption extent</term><term>Sorption isotherm</term><term>Sorption isotherms</term><term>Sorption kinetics</term><term>Sorption kinetics data</term><term>Sorption microbalance</term><term>Sorption process</term><term>Sorption time</term><term>Vapour</term><term>Vapours</term><term>Volume fraction</term><term>Water activities</term><term>Water activity</term><term>Water vapour</term><term>Weight gain</term><term>Weight gains</term><term>Whole sorption kinetics</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>éthanol</term><term>Polymère</term><term>Solvant</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Solvent sorption and diffusion are the key processes that control membrane performances in membrane processes. The sorption characteristic of water and ethanol vapours in poly(vinylalcohol) (PVA) membranes of different crystallinity degrees was measured by microgravimetry and the diffusion characteristic was calculated from the sorption kinetics at different water activities by curve fitting. The sorption isotherms for water vapour in membranes of 28, 37, 44 and 56% crystallinity degrees at 40°C obey the Flory equation based on the polymer lattice model. When the sorption extent was corrected by assuming that only the polymer amorphous phase is accessible to the penetrant, a unique Flory χ interaction parameter, 0.3, was obtained for all samples except for the 28% crystallinity sample. For the latter sample, the lower χ value (0.18) obtained can be explained by a change in the sorption behaviour of the original crystalline domains which may undergo partial destruction. The diffusion coefficient increases with the average water content in the membrane according to an exponential relationship characterized by a limit diffusion coefficient and a plasticization coefficient. The higher the crystallinity of the membrane, the lower the values of the limit diffusion coefficient and the plasticization coefficient. The ethanol sorption was also well described by the Flory–Huggins equation. The limit diffusion coefficient for water was two orders of magnitude larger than that for ethanol.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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