• 전기학회논문지
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• 제59권12호
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• pp.2235-2239
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• 2010

In this study, The cation exchange membrane and the anion exchange membrane affect in electrical conduction of metal fuel cell was investigated. Magnesium material as anode electrode and the NaCl solution dissolved with 5~15wt% as electrolyte were used for the metal fuel cell. It was found that magnesium slag where flows toward the air electrode was suppressed by using ion exchange membrane. The open circuit voltage variation during discharge has very flat pattern by using ion exchange membrane, but the case which is not the exchange membrane, the open circuit voltage increased according to time. When using the anion exchange membrane, the electric current was higher case of the cation exchange membrane, as a result of higher equivalent conductivity in anion Cl-. The cation exchange membrane was observed with the fact that the output power is excellent in compared with anion exchange membrane.

• 멤브레인
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• 제21권2호
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• pp.141-147
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• 2011

바나듐 레독스-흐름 전지 (V-RFB)용 격막으로 사용하기 위해 폴리설폰(psf)에 폴리페닐렌설파이드설폰(PPSS)을 블록 공중합 시킨 폴리머와 여기에 TPA (tungstophosphoric acid)를 첨가하여 양이온교환막을 제작하였다. 제작한 막은 1M $H_2SO_4$용액을 사용하여 막 저항을 평가하였다. 제작한 Psf-PPSS와 Psf-TPA-PPSS 양이온교환막의 막 저항은 약 $0.94{\Omega}{\cdot}cm^2$를 나타냈다. 제작한 양이온교환막과 Nafion117을 격막으로 사용하여 V-RFB의 전기화학적 특성을 평가하였다. 4 A의 전류에서 측정한 V-RFB의 충 방전 셀 저항은 막의 종류에 따라 Nafion117 < Psf-TPA-PPSS < Psf-PPSS 의 순서로 값이 낮았다. 막을 5가 바나듐 수용액에 침적하여 침적시간 변화에 따른 V-RFB의 총 방전 셀 저항을 측정함으로써 내구성을 평가하였다. 내구성은 제작한 Psf-PPSS 막이 가장 우수하였으며, Nafion117막과 제작한 Psf-TPA-PPSS막이 서로 동등하였다.

• Korean Chemical Engineering Research
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• 제44권4호
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• pp.340-344
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• 2006

폴리스티렌을 acetyl sulfate 시약을 사용하여 술폰화시킨 후 다공성 양이온교환 막으로 제조하였다. 제조된 막의 특성을 분석한 결과 다공성의 형태를 가졌음을 확인할 수 있었고, IR 분석결과 술폰산기의 도입을 확인할 수 있었다. 전체적으로 반응물 중 황산의 양이 증가할수록 이온교환능력이 증가하는 경향을 확인할 수 있었고, 전기투석 공정에 적용가능성을 판단한 결과 양이온에 대한 선택성과 음이온에 대한 배제성을 간접적으로 확인할 수 있었다.

• 한국막학회:학술대회논문집
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• 한국막학회 1999년도 추계 총회 및 학술발표회
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• pp.52-54
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• 1999

• 한국막학회:학술대회논문집
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• 한국막학회 2003년도 The 4th Korea-Italy Workshop
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• pp.1-4
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• 2003

LDPE/polystyrene cation exchange membranes were prepared through a monomer-sorption method and UV radiation polymerization. The reaction behaviors in the preparation were investigated. The membranes prepared were characterized in terms of physical and electrochemical properties. The membranes exhibited reasonable properties for an ion-exchange membrane with weight gain (Wr) of above 0.3, electrical resistance of below 1.0 Ω $\textrm{cm}^2$ and ion-exchange capacity of 1.8 meq/g-dry membrane. DSC studies and FE-SEM image revealed the formation of a homogeneous membrane. Both the current-voltage and the chronopotentiometric curves of the membranes indicated that LDPE/polystyrene membranes can be properly used at a high current density, and the surface homogeneity of cation-exchange sites in the membrane was comparable to that in a commercial membrane.

• 멤브레인
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• 제10권2호
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• pp.66-74
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• 2000

In consideration that a high tensile strength and ion exchange capacity are maintained as the swelling of membrane is controlled by the coagulation of PSf with the introduction of ion exchange groups and PPSS without the introduction of ion exchange groups, the block copolymer of PSf and PPSS were synthesized. The cation exchange membrane was prepared by sulfonation with CSA and casted. The synthesized block copolymer and cation exchange membrane were characterized by FT-IR and their thermal stability was confirmed by TGA. The optimum sulfonation could be accomplished at a mole ratio of BPSf to CSA 1:3. The best electrochemical properties obtained by the optimal condition were area resistance of 4.37 $\Omega$ㆍ$\textrm{cm}^2$, ion exchange capacity of 1.71 meq/g dry membrane, water content of 0.2941 g $H_2O$/g dry membrane, and fixed ion concentration of 5.81 meq/g $H_2O$. When GBL was used as an additive, area resistance was increased by 13.7 % and ion exchange capacity was increased by 14.6%. When the membrane was fabricated in a form of composite using non woven cloth as a support. the tensile strength of membrane could be improved, but the electrochemical characteristics were not influenced.

• 멤브레인
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• 제12권1호
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• pp.1-7
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• 2002

양이온만을 선택적으로 투과하는 양이온교환막의 응용분양에는 electrodialysis, deffusion dialysis, reverse osmosis, membrane electrolysis, membrance fuel cell 등이 있다. 현재 사용화된 양이온교환막들은 좋은 성능과 안정성을 가지고 있지만 가격이 너무 비싸고 일부응용분야에 최적화 되지 않은 문제를 가지고 있다. 이를 해결하기 위해 많은 연구가들은 저렴하고 생산이 용이하며 각 응용분야에 적용 가능한 여러 가지 양이온교환막의 소재에 대한 연구를 진행하여 왔다. 그 소재들의 소개와 이를 이용한 양이온교환막의 성능과 특성에 대하여 기술하였다.

• Korean Chemical Engineering Research
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• 제56권3호
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• pp.361-369
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• 2018

A manufacturing method has been devised to prepare novel heterogeneous cation exchange membranes by mixing ethylene vinyl acetate (EVA) copolymers with a commercial cation exchange resin. Optimum material characteristics, mixture ratios and manufacturing conditions have been worked out for achieving favorable membrane performance. Ion exchange capacity, electrical resistance, water uptake, swelling ratio and tensile strength properties were measured. SEM analysis was used to monitor morphology. Effects of vinyl acetate (VA) content, melt index (MI) and ion exchange resin content on properties of heterogeneous cation exchange membranes have been discussed. An application test was carried out by mounting a selected membrane in a membrane capacitive deionization (MCDI) system to investigate its desalination capability. 0.92 meq/g of ion exchange capacity, $8.7{\Omega}.cm^2$ of electrical resistance, $40kgf/cm^2$ of tensile strength, 19% of swelling ratio, 42% of water uptake, and 56.4% salt removal rate were achieved at best. VA content plays a leading role on the extent of physical properties and performance; however, MI is important for having uniform distribution of resin grains and achieving better ionic conductivity. Overall, manufacturing cost has been suppressed to 5-10% of that of homogeneous ion exchange membranes.

• Membrane and Water Treatment
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• 제14권2호
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• pp.55-63
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• 2023

In this study, the influence of different IEMs (ion exchange membranes) to performance of the hypochlorite electrolysis unit with Cl₂ recovery stream was investigated. More specifically, Nafion 117-a representative cation exchange membrane (CEM)-and aminated polypheylene oxide (APPO)-an anion exchange membrane (AEM)-were installed in the hypochlorite electrolysis unit, and the performance and the energy efficiency of the units were evaluated and compared. Regardless of whether CEM (Nafion 117) or AEM (APPO) was installed, the rate of hypochlorite generation was increased (by up to 24.3% and 22.2% for Nafion 117 and APPO, respectively) compared with the unit without an IEM. On the other hand, the power efficiency and the optimum operation condition of hypochlorite production units seem to depend on the conductivity and stability of the installed IEM. As the result, between Nafion 117 and APPO, higher performance and efficiency were achieved with Nafion 117, due to excellent conductivity and stability of the membrane.

• 멤브레인
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• 제19권2호
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• pp.129-135
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• 2009

바나듐 레독스-흐름 전지용 격막으로 사용하기 위해 폴리설폰(Psf)에 폴리페닐렌설파이드설폰(PPSS)을 블록 공중합 시킨 폴리머를 사용하여 양이온교환막을 제작하여, 막 특성을 평가하였다. 제작한 양이온교환막은 Nafion117보다 열적 안정성이 뛰어나다는 것을 TG분석을 통해 알 수 있었고, 1몰 황산용액에서의 막 저항은 3 cc의 CSA를 도입하였을 때 $0.96{\Omeg}{\cdot}cm^2$로 제일 작은 저항 값을 나타냈다. 제작한 양이온교환막의 바나듐 레독스-흐름 전지에서의 전기화학적 특성에 대해 평가하였다. 제작한 양이온교환막을 사용한 바나듐 레독스-흐름 전지의 100% 충전상태에서의 기전력은 바나듐 레독스-흐름 전지의 기전력 값인 1.4V를 나타냈으며, 각 충전상태에서의 충 방전 셀 저항은 Nafion117을 사용한 전지의 값보다 작은 값을 나타냈다.