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Poly(etherimide) 중공사막 제조에서 비용매첨가 효과에 관한 연구
Study on the Effect of Non-Solvent Additive in the Preparation of the Poly(etherimide) Hollow Fiber Membrane
동국대학교 화학공학과, 서울 100-715
Department of Chemical Engineering, Dongguk University, 3-26 Pildong, Choonggu, Seoul 100-715, Korea
bskim@dongguk.edu
HWAHAK KONGHAK, August 2001, 39(4), 397-403(7), NONE
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Abstract
Poly(etherimide) 기체분리용 중공사막 제조에서 비용매첨가제인 알코올류가 막구조형성에 미치는 영향을 연구하였다. PEI 중공사막은 비대칭 고분자막의 제조에 널리 사용되고 있는 건·습식 상전환법을 이용하여 제조하였다. 비용매첨가제는 C1-C4의 알코올류(methanol(MeOH), ethanol(EtOH), propanol(PrOH), buthanol(BuOH))과 diethylene-glycerol(DegOH)을 사용하였고 용매는 용매로는 N-methyl-2-pyrrolidong(NMP)을 사용하였다. 제조된 PEI중공사막은 내·외경이 450/150 μm였다. NMP/MeOH의 경우 가장 좋은 분리성능을 나타내었다. 실리콘 코팅후 산소의 투과도가 0.5 GPU이고, 산소/질소의 선택도가 5.7인 중공사막을 제조하였다. SEM을 통한 막구조 관찰로 비용매 첨가효과를 검토한 결과, C1-C4의 알코올을 사용하였을 경우 막은 finger-like 구조를 나타내었으며, diethylene-glycerol의 경우 sponge-like 구조를 나타내었다.
Poly(etherimide) hollow fiber membranes for the oxygen enrichment were prepared by dry-wet phase inversion processes from spinning solution containing NMP and an alcohols as a nonsolvent-additive. The alcohols used in this study include four alcohols(methanol, ethanol, propanol, buthanol) and diethylene glycol. The effect of the alcohols as nonsolvent-addi-tive on the spinning solution properties; permeation fluxes of pure O2 , N2 ; and structures of the PEI hollow fiber membrane were investigated. The PEI hollow fiber membrane with an outer diameter of about 450 mm and inner diameter of about 150 mm were prepared. The PEI hollow fiber membrane prepared from NMP/MeOH solvent systems exhibited the best gas separation charac-teristics. After silicon coating, these hollow fiber exhibited approximately a oxygen permeance 0.5 GPU with a 5.7 selectivity to nitrogen. Through SEM microphotograph we also got a finger-like(C1-C4 alcohols), sponge-like(diethylene glycol) substructures.
Keywords
References
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Kimmerle K, Strathmann H, Desalination, 79, 283 (1990)
Yamasaki A, Tyagi RK, Fouda AE, Matsuura T, Jonasson K, J. Membr. Sci., 123(1), 89 (1997)
Cheng JM, Wang DM, Lin FC, Lai JY, J. Membr. Sci., 109(1), 93 (1996)
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Llody D, ACS Symp. Ser., 269, 24 (1985)
Chug TS, Kafchinski ER, Foley P, J. Membr. Sci., 75, 181 (1992)
Kesting RE, Fritzshe AK, Murphy MK, Hadermann AC, Cryse CA, Malon RF, U.S. Patent, 4, 871, 494 (1989)
Fritzsche AK, Murphy MK, Cruse CA, Malon RF, Kesting RE, Gas Sep. Purif., 106, 219 (1989)
Kesting RE, Fritzshe AK, Cruse A, Murphy MK, Handermann AC, Malon RF, Moore MD, J. Appl. Polym. Sci., 40, 1557 (1990)
Reuvers AJ, "Membrane Formation-Diffusion Induced Demixing Process in Ternary Polymeric Systems," Ph.D. Thesis, University of Twente, The Netherlands, 1987 (1987)
Cohen C, J. Polym. Sci. B: Polym. Phys., 17, 477 (1979)
Kang YS, Kim HJ, Kim UY, J. Membr. Sci., 60, 219 (1991)
Van Hof JA, Reuvers AJ, Boom RM, Rolevink HHM, Smolders CA, J. Membr. Sci., 70, 17 (1992)
Wang DL, Li K, Teo WK, J. Membr. Sci., 115(1), 85 (1996)
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Kurdi J, Tremblay AY, J. Appl. Polym. Sci., 73(8), 1471 (1999)
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Kesting RE, Fritzsche AK, Murphy MK, J. Appl. Polym. Sci., 40, 1557 (1990)
Vankrelen DW, "Properties of Polymer," Elsevier, Amsterdam (1990)
J. Van Helmad from General Electric, in "European Technical Symposium on Polyimides," STEP1/polyimide, 1, C-6/1, FRANCE (1989)
