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Phase Behavior and Morphological Studies of Polysulfone Membranes; The Effect of Alcohols Used as a Non-solvent Coagulant  

Park Byung Gil (School of Chemical Engineering, College of Engineering Hanyang University)
Kong Sung-Ho (chool of Chemical Engineering, College of Engineering Hanyang University)
Nam Sang Yong (Department of Polymer Science and Engineering, Gyeongsang National University)
Publication Information
Membrane Journal / v.15, no.4, 2005 , pp. 272-280 More about this Journal
Abstract
In this study, asymmetric polysulfone membranes were prepared by the phase inversion method and the casting solutions were containing N-methyl-2-pyrrolidone (NMP) as a solvent. Deionized water and various alcohols(methanol, ethanol, and propanol) were used as a coagulation medium in preparing asymmetric polysulfone membranes. This study investigates the effect of alcohol coagulants having different solubility parameters as a pore-former on the construction of porous structures and their pure water permeation properties. Asymmetric polysulfone membranes immersed in the pure alcohol coagulation bath solution showed the typical sponge-like structures and the reduced water permeability as compared with those of polysulfone membranes precipitated in the pure water coagulation bath solution. In the water/alcohol mixtures, asymmetric polysulfone membranes showed the finger-like structures with the sponge-like structures. Therefore, the sponge-like structure of polysulfone membrane was formed under the delayed demixing systems while the porosity of membrane was decreased significantly. The water permeability of polysulfone membrane precipitated in the pure water coagulant showed 164 [$L/m^2hr$] at 14.7 psi. In case of polysulfone membranes prepared in the pure methanol and ethanol coagulant, they showed the water permeability of 56 and 30 [$L/m^2hr$], respectively.
Keywords
polysulfone; UF membrane; alcohol coagulant; phase inversion method;
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1 S. Loeb and S. S ourirajan, 'Sea water demineralization by means of an osmotic membrane', Adv. Chem. Ser., 38, 117 (1963)
2 R. E. Kesting, 'Synthetic Polymeric Membranes', Wiley, New York (1985)
3 Y. S. Kang, H. J. Kim, and U. Y. Kim, 'Asymmetric membrane formation via immersion precipitation method; I. Kinetic effect', J. Membr. Sci., 60, 219 (1991)
4 C. A. Smolders, A. J. Reuvers, R. M. Boom, and I. M. Wienk, 'Microstructures in phase-inversion membranes. Part 1: Formation of macrovoids', J. Memb. Sci., 73, 259 (1992)
5 C. W. Yao, R. P. Burford, A. G. Fane, and C. J. D. Fell, 'Effect of coagulation conditions on structure and properties of membranes from aliphatic polyamides', J. Memb. Sci., 38, 133 (1988)
6 R. M. Boom, I. M. Wienk, T. Van den Boomgaard, and C. A. Smolders, 'Microstructures in phase inversion membranes; Part 2. The role of a polymeric additive', J. Membr, Sci., 73, 277 (1992)
7 F. G. Paulsen, S. S. Shojaie, and W. B. Krantz, 'Effect of evaporation step on macrovoid formation in wet-cast polymeric membranes'. J. Memb. Sci., 91, 265 (1994)
8 P. Van de Witte, P. J. Dikjkstra, J. W. A. Van den Berg, and J. Feijen, 'Phase separation processes in polymer solution in relation to membrane formation', J. Membr. Sci., 117, 1 (1996)
9 A. Ziabicki, 'Fundamentals of Fiber Formation, The Science of Fiber Spinning and Drawing', Willey, pp. 300, (1976)
10 J. Y. Lai, F. C. Lin, C. C. Wang, and D. M. Wang., 'Effect of nonsolvent additives on the porosity and morphology of asymmetric TPX membranes', J. Membr. Sci., 118, 49 (1996)
11 T. H. Young and L. W. Chen, 'Pore mechanism of membrane from phase inversion process', Desalination, 103, 233 (1995)
12 S. C. Pesek and W. J. Koros, 'Aqueous quenched asymmetric polysulfone membranes prepared by dry/wet phase separation', J. Membr. Sci., 81, 71 (1993)
13 Y. K. Kim, J. M. Lee, H. B. Park, and Y. M. Lee, 'Carbon molecular sieve membranes derived from thermally labile polymer containing polyimide and their gas separation properties', Membrane J, 13, 182 (2003)
14 J. Won, Y. S. Kang, H. C. Park, and U. Y. Kim, 'Light scattering and membrane formation studies on polysulfone solutions in NMP and in mixed solvents of NMP and ethyl acetate', J. Membr. Sci., 145, 45 (1998)   DOI   ScienceOn
15 Nico Schamagl and Heinz Buschatz, 'Polyacrylonitrile (PAN) membranes for ultra- and microfiltration', Desalination, 139, 191 (2001)
16 M. Mulder, 'Basic Principles of Membrane Technology', Kluwer Academic Publishers, London (1996)
17 J. H. Kim and K. H. Lee, 'Effect of PEG additive on membrane formation by phase inversion', J. Membr. Sci., 138, 153 (1998)
18 R. J. Ray, W. B. Krantz, and R. L. Sani, 'Linear stability theory model for finger formation in asymmetric membranes', J. Memb. Sci., 23, 155 (1985)
19 J. H. Kim, B. R. Min, H. C. Park, J. Won, and Y. S. Kang, 'Phase behavior and morphological studies of polyimide/PVP/solvent/water systems by phase inversion', J. Appl. Polym. Sci., 81, 3481 (2001)   DOI   ScienceOn
20 A. J. Reuvers and C. A. Smolders, 'Formation of membranes by means of immersion precipitation; Part I. A model to describe mass transfer during immersion precipitation', J. Membr. Sci., 34, 45 (1987)
21 D. M. Wang, F. C. Lin, T. T. Wu, and J. Y. Lai, 'Formation mechanism of the macrovoids induced by surfactant additives', J. Membr. Sci., 142, 191 (1998)
22 K. Scott and R. Hughes, 'Industrial Membrane Separation Technology', Chapman & Hall, London (1996)