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Effect of Toluene Added to Casting Solution on Characteristic of Phase Inversion Polysulfone Membrane  

Choi, Seung-Rag (Chemical Engineering, Division of Applied Bio-Chemistry, Chungnam National University)
Park, So-Jin (Chemical Engineering, Division of Applied Bio-Chemistry, Chungnam National University)
Seo, Bum-Kyoung (Division of Decommissioning Technology Development, Korea Atomic Energy Research Institute)
Lee, Kune Woo (Division of Decommissioning Technology Development, Korea Atomic Energy Research Institute)
Han, Myeong-Jin (Department of Display and Chemical Engineering, Kyungil University)
Publication Information
Applied Chemistry for Engineering / v.19, no.6, 2008 , pp. 633-639 More about this Journal
Abstract
Polysulfone membranes were prepared via the phase inversion process. Toluene was added as a nonsolvent additive in the casting solution containing a mixture of polysulfone and n-methylpyrrolidone. When prepared via the diffusion-induced process using isopropanol as a precipitation nonsolvent, the solidified membranes revealed a similar asymmetric structure irrespective of the addition of toluene, presenting both a dense skin layer and a sponge-like support layer. The added toluene played a role of enhancing liquid-liquid phase separation of the casting solution, and skin layer thickness of a prepared membrane increased with toluene content in the casting solution. On membrane performance, the solute rejection showed a uniform behavior irrespective of the addition of toluene. However, in spite of the significant increase in dense skin layer thickness, the water permeation through the membrane prepared with 60 wt% toluene revealed five times as much flux, compared with that of the membrane prepared without toluene additive.
Keywords
membrane; phase inversion; polysulfone; nonsolvent additive; permeation;
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