New ways to produce porous polymeric membranes by carbon dioxide foaming

Krause, B. and Vegt van der, N.F.A. 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)
Research Group:	Membrane Science and Technology (MST)
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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