Abstract
Asymmetric skinned membranes, first developed by Loeb and Sourirajan1 for cellulose acetate as a polymer material, owe their practical value in ultrafiltration and reverse osmosis techniques to the minimization of the hydrodynamic barrier while the selectivity and the mechanical properties of the membranes are maintained. These membranes consist of a very thin dense skin (0.1 to 0.5 μm thickness) and a porous sublayer (0.1 to 0.2 mm thick) of the same polymeric material, see e.g. ref. 2. It has been shown a.o. by Frommer3 that for the same polymer one can obtain different kinds of morphologies in the asymmetric membrane by changing the preparation conditions. Also it has become common knowledge4–6 that many other polymers than cellulose acetate can be used to prepare asymmetric, skinned membranes.
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Smolders, C.A. (1980). Morphology of Skinned Membranes: A Rationale from Phase Separation Phenomena. In: Cooper, A.R. (eds) Ultrafiltration Membranes and Applications. Polymer Science and Technology, vol 13. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3162-9_11
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DOI: https://doi.org/10.1007/978-1-4613-3162-9_11
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