High‐performance membranes for pervaporation II. Crosslinked poly(vinyl alcohol)–poly(acrylic acid) blends
Identifieur interne : 000722 ( Istex/Corpus ); précédent : 000721; suivant : 000723High‐performance membranes for pervaporation II. Crosslinked poly(vinyl alcohol)–poly(acrylic acid) blends
Auteurs : Zhenghua Ping ; Quang-Trong Nguyen ; Azouz Essamri ; Jean NéelSource :
- Polymers for Advanced Technologies [ 1042-7147 ] ; 1994-06.
English descriptors
- KwdEn :
- Acid catalyst, Acid functions, Aqueous solutions, Blend, Blend composition, Blend membranes, Blend structure, Certain extent, Coefficient, Crosslinked, Crosslinked films, Crosslinked membranes, Crosslinking, Crosslinking agent, Crosslinking effect, Crosslinking procedure, Crosslinking reaction, Crystallinity, Differential permeation, Diffusion coefficient, Diffusivity, Esterification reaction, Feed mixture, Heat treatment, High affinity, High permeability, Higher affinity, Homogeneous blend solutions, Hydroxyl groups, Infrared spectra, Intermolecular hydrogen, John wiley sons, Linear combination, Maleic acid, Membrane, Membrane preparation, Membrane properties, Membrane resistance, Membrane thickness, Molecular weight, Organic solvents, Permeability, Permeability coefficients, Permeation, Permeation fluxes, Pervaporation, Polymer, Polymer components, Polymer miscibility, Preliminary experiments, Propanol, Propanol diffusivity, Pure water, Selectivity, Semicrystalline polymer, Surface chains, Water content, Water diffusivity.
- Teeft :
- Acid catalyst, Acid functions, Aqueous solutions, Blend, Blend composition, Blend membranes, Blend structure, Certain extent, Coefficient, Crosslinked, Crosslinked films, Crosslinked membranes, Crosslinking, Crosslinking agent, Crosslinking effect, Crosslinking procedure, Crosslinking reaction, Crystallinity, Differential permeation, Diffusion coefficient, Diffusivity, Esterification reaction, Feed mixture, Heat treatment, High affinity, High permeability, Higher affinity, Homogeneous blend solutions, Hydroxyl groups, Infrared spectra, Intermolecular hydrogen, John wiley sons, Linear combination, Maleic acid, Membrane, Membrane preparation, Membrane properties, Membrane resistance, Membrane thickness, Molecular weight, Organic solvents, Permeability, Permeability coefficients, Permeation, Permeation fluxes, Pervaporation, Polymer, Polymer components, Polymer miscibility, Preliminary experiments, Propanol, Propanol diffusivity, Pure water, Selectivity, Semicrystalline polymer, Surface chains, Water content, Water diffusivity.
Abstract
Dense membranes made by crosslinking of poly(vinyl alcohol) (PVA) with poly(acrylic acid) (PAA) were prepared and tested in pervaporation and differential permeation of water–alcohol mixtures. Instead of a decrease of permeation flux as generally observed with most crosslinking agents, an increase in the permeability was observed with PAA crosslinked membranes at low PAA contents. The permeation flux increases with PAA contents in the polymer with no selectivity reduction for membranes containing less than 15 wt. % PAA. The membranes show good performances to water–2‐propanol and water–ethanol mixtures, i.e. high fluxes and high selectivities to pure water. The membranes were stable and highly permeable to water. The enhancement of the permeability of PVA can be explained by a reduced crystallinity and an improved diffusivity due to the presence of PAA.
Url:
DOI: 10.1002/pat.1994.220050604
Links to Exploration step
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<front><div type="abstract" xml:lang="en">Dense membranes made by crosslinking of poly(vinyl alcohol) (PVA) with poly(acrylic acid) (PAA) were prepared and tested in pervaporation and differential permeation of water–alcohol mixtures. Instead of a decrease of permeation flux as generally observed with most crosslinking agents, an increase in the permeability was observed with PAA crosslinked membranes at low PAA contents. The permeation flux increases with PAA contents in the polymer with no selectivity reduction for membranes containing less than 15 wt. % PAA. The membranes show good performances to water–2‐propanol and water–ethanol mixtures, i.e. high fluxes and high selectivities to pure water. The membranes were stable and highly permeable to water. The enhancement of the permeability of PVA can be explained by a reduced crystallinity and an improved diffusivity due to the presence of PAA.</div>
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