New ways to produce porous polymeric membranes by carbon dioxide foaming

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Krause, B. and Vegt, N.F.A. van der and Wessling, M. (2002) New ways to produce porous polymeric membranes by carbon dioxide foaming. Desalination, 144 (1-3). pp. 5-7. ISSN 0011-9164

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Abstract:As a new solvent free method for membrane formation, we have investigated the foaming of high-Tg polymers. We report two different routes for the formation of open-microcellular and open-nanoporous membrane morphologies. Porosity is introduced by expansion of carbon dioxide saturated films and hollow fibers at elevated temperatures. The microcellular structure manifests itself by small spot-like openings with diameters between 50 and 200 nm in the cell walls. The nanoporous structures exhibit a lacy structure with pore sizes between 2 and 50 nm. The mass transport resistance of the membrane structures is characterized in detail on the basis of gas permeation measurements.
Item Type:Article
Copyright:© 2002 Elsevier Science B.V
Faculty:
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/38157
Official URL:http://dx.doi.org/10.1016/S0011-9164(02)00280-1
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Metis ID: 209111