Asymmetric porous thin film preparation by controlled solvent absorption using PDMS

We present a simple and yet effective method of producing asymmetric polymeric membranes. All it takes to prepare the membrane is to place a flat slab, which can absorb the solvent readily, on a polymer solution. The rapid absorption of the solvent by the slab leads to the formation of a thin dense...

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Bibliographic Details
Published in:Journal of membrane science 2007-11, Vol.305 (1), p.5-12
Main Authors: Song, Seokyong, Khang, Dahl-Young, Kim, M. Joon, Park, Jeong-Eun, Lee, Hong H.
Format: Article
Language:English
Subjects:
Asymmetric porous thin film
Morphology
Phase separation
Poly(methyl methacrylate) (PMMA)
Polydimethylsiloxane (PDMS)
Solvent absorption
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Summary:We present a simple and yet effective method of producing asymmetric polymeric membranes. All it takes to prepare the membrane is to place a flat slab, which can absorb the solvent readily, on a polymer solution. The rapid absorption of the solvent by the slab leads to the formation of a thin dense skin layer and the presence of this top dense layer allows for the phase separation in the polymer solution to proceed beneath the layer. The solubility of a polymer in a solvent, as affected by solubility parameter and polymer molecular weight, determines the morphology of the membrane prepared by this controlled solvent absorption method. The preparation conditions can be tailored to produce “double-skinned” membranes and membranes with localized pore structure.
ISSN:0376-7388
1873-3123
DOI:10.1016/j.memsci.2007.08.004