PE계 불균질 양이온 교환막의 제조와 특성:1.결합제와 이온교환수지의 비율에 따른 영향

양현수; 조병하; 강봉규; 이태원

Journal of the Korean Industrial and Engineering Chemistry, Vol.7, No.6, 1132-1141, December, 1996

Preparation and Characteristics of Heterogeneous Cation Exchange Membrane : 1. Mixing Ratio of Matrix and Ion Exchange Resin

양현수, 조병하, 강봉규, 이태원

초록

결합제인 LLDPE와 전기화학적 특성을 부여하는 강산성 양이온교환수지를 혼합한 후 글리세롤을 첨가하여 전기탈이온 시스템과 전기투석용 불균질 양이온교환막을 제조하였다. 결함제와 이온교환수지의 무게비율[(60%/40%)/5%, (55%/45%)/5%, (50%/50%)/5%, (40%/60%)/5%]에 따라서 막을 제조하여 각각의 기계적, 전기화학적, 형태학적, 이온투과특성을 고찰하고 상용막과 비교하였다. (50%/50%)/5%의 비율로 제조된 막의 전기화학적 특성은 이온교환 용랑 1.733meq/g, 운반율 0.96, 막저항 16.08Ω/㎠의 값을 나타태어 IONPURE사의 불균질 양이온교환막과 비교해 볼 때 유사한 특성값을 보였고, 이온투과특성에서는 높은 효율을 보였다. 반면에 기계적 특성은 인장강도 62.33kg/㎠, 신장율 87.42%, 탄성율 658.53kg/㎠으로 상용막 보다 인장강도는 우수하였지만 신장율과 탄성율은 약간 낮은 값을 나타내었다. 모든 특성치에서 (50%/50%)/5%로 제조된 막이 최적의 값을 나타내었다.

Heterogeneous cation exchange membrane(HCEM) was prepared with LLDPE(Linear Low Density Poly-ethylene) as binder, powdered cation exchange resins(diameter ≤ 149㎛) as ion-exchange material and glycerol as additive for electrodialysis and electrodeionization system. The weight ratio of (binder/ion exchange)/glycerol was (60%/4o%)/5%, (55%/45%)/5%, (50%/50% )/5% and (40%/6o% )/5% . The characterization of prepared HCEM was evaluated on mechanical, electrochemical, morphology and ion permeable properties. It was compared with commercial membrane. Electrochemical properties of HCEM of (50%/50% )/5% were very similar to value of IONPURE(commercial membrane), in which ion exchange capacity, ion transfer number and membrane resistance were to be 1.733meq/g, 0.96 and 16.08Ω/㎠, respectively. Ion permeability of the membrane was better than that of IONPURE membrane. Compared with IONPURE membrane, the HCEM had a higher tensile strength and lower elongation and modulus, in which HCEM had tensile strength of 62.33kg/㎠, elongation of 87.42% and modulus of 658.53kg/㎠. The HCEM of (50%/50% )15% was optimum combination.

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[1] Juda W, McRae WA, J. Am. Chem. Soc., 72, 1044 (1950)

[2] Juda W, McRae WA, U.S. Patent, 2,636,851 (1953)

[3] Kesting RE, "Synthetic Polymeric Membranes," John Wiley Sons, New York (1985)

[4] NobleRichard D, AlexanderStern S, "Membrane Seperations Technology," (1995)

[5] Belfort G, "Synthetic Membrane Process," Academic Press (1984)

[6] Giuffrida, "Heterogeneous Membrane and Method" PCT Int. Appl. WO 94. 06,850 (1994)

[7] MolauGunther E, J. Membr. Sci., 8, 309 (1981)

[8] Simon GP, Desalination, 59, 61 (1986)

[9] Sata T, Izou R, Colloid Polym. Sci., 256, 757 (1978)