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http://dx.doi.org/10.14478/ace.2011.22.3.277

Preparation and Characterization of Polysulfone Membranes Using PVP as an Additive  

Lee, Jin Young (Chemical Engineering, Division of Applied Bio-Chemistry, Chungnam National University)
Lee, Kune Woo (Division of Decommissioning Technology Development, Korea Atomic Energy Research Institute)
Han, Myeong-Jin (Department of Chemical Engineering, Kyungil University)
Park, So-Jin (Chemical Engineering, Division of Applied Bio-Chemistry, Chungnam National University)
Publication Information
Applied Chemistry for Engineering / v.22, no.3, 2011 , pp. 277-285 More about this Journal
Abstract
Polysulfone (PSf) membranes were prepared via the phase inversion process. Polyvinylpyrrolidone (PVP) was added as a nonsolvent additive in the casting solution containing a mixture of PSf and n-methylpyrrolidone. The added PVP played a role of enhancing liquid-liquid phase separation of the casting solution, and significantly reduced the solution fluidity. When prepared via the diffusion-induced process using water as a precipitation nonsolvent, the solidified membranes revealed a typical asymmetric structure irrespective of the addition of PVP. With 5 wt% PVP content, the finger-like cavities were more developed in the membrane sublayer compared to that of the membranes prepared without PVP. In contrast, with more than 10 wt% of PVP, the formation of finger-like cavities was suppressed, and the thickness of polymer nodule layer was increased. The surface porosity was also increased with the PSf content in the casting solution. The water permeability curve as a function of PVP addition revealed the inflection point. The maximum water permeability for 12 wt% PSf membrane was obtained with 5 wt% PVP content, and that for 18 wt% PSf membrane with 15 wt% PVP.
Keywords
membrane; phase inversion; polysulfone; polyvinylpyrrolidone; additive;
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