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  4. Tuning the Morphology and Gas Separation Properties of Polysulfone Membranes
 
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August 5, 2022
Journal Article
Title

Tuning the Morphology and Gas Separation Properties of Polysulfone Membranes

Abstract
The present work deals with the modification of casting solutions for polysulfone gas separation membranes fabricated by wet-phase inversion. The aim was to fabricate membranes with thin gas separation layers below one micrometer of thickness and a sponge-like support structure. With decreasing thicknesses of the separation layers, increasing permselectivities were observed. For the first time, we could show that permeabilities and diffusion coefficients of certain gases are orders of magnitude lower in separation layers of membranes below 500 Å of thickness compared to separation layers with a thickness above 1 micrometer. These results indicate that the selection of the solvent system has a huge impact on the membrane properties and that the permeability and diffusion coefficient are not material-related properties. Thus, they cannot be applied as specific indicators for gas-separating polymers. In this publication, scanning electron microscopy and gas permeation measurements were carried out to prove the gas separation properties and morpholo-gies of polysulfone membranes.
Author(s)
Kluge, Steven  
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Kose, Tillmann
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Tutus, Murat  
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Journal
Membranes  
Open Access
DOI
10.3390/membranes12070654
Language
English
Fraunhofer-Institut für Angewandte Polymerforschung IAP  
Keyword(s)
  • biogas

  • flat sheet membranes

  • gas separation

  • membrane morphology

  • polysulfone membrane

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