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원자이동 라디칼 그래프트 중합법을 이용한 양이온 교환 멤브레인의 제조 및 바나듐 레독스 흐름 전지 격막으로의 응용
서미영(Mi-Young Seo),최성호(Seong-Ho Choi) 융복합지식학회 2022 융복합지식학회논문지 Vol.10 No.2
바나듐 레독스 흐름전지 격막으로 사용하기 위하여, 양이온 교환멤브레인을 원자이동 라디칼 그래프트 중합법으로 합성하였다. 구체적으로 양이온 교환 멤브레인의 주쇄사슬로써 범용플라스틱인 poly(vinyl chloride)를 사용하였다. 여기에 술폰산기(-SO₃Na)를 갖은 4-styrene sulfonate를 원자이동 라디칼 그래프트 중합시킴으로서 poly(vinyl chloride)-g-poly(styrene sulfonate), 약칭 PVC-g-PSS, 합성한 후, 핸디 캐스팅하여 양이온 교환 멤브레인을 제작하였다. 제조된 양이온 교환 멤브레인에 대하여 물 흡착률과 팽창률, 이온 전도도, 이온 교환 용량, 바나듐 투과도, 인장강도를 측정 평가되었다. 또한, 제조된 양이온 교환 멤브레인의 직접 바나듐 레독스 흐름 전지에 적용하여 1,000회 충전 및 방전시킴으로써 이온-교환 막으로써의 안정성이 평가하였다. 이 결과 제조된 PVC-g-PSS 양이온 교환 멤브레인의 경우 바나듐 레독스 흐름전지에 사용할 수 있다. In order to use vanadium redox flow battery separator, we synthesized a cation exchange membrane by atom transfer radical graft polymerization. Poly(vinyl chloride) which is known as a general plastic materials, was used as the main chain polymer of the cation exchange membrane. The poly(vinyl chloride) is grafted by atom transfer radical graft polymerization of 4-styrene sulfonate with sulfonate group (-SO₃Na) to give poly(vinyl chloride)-g-poly(styrene sulfonate), PVC-g-PSS. The cation exchange membrane was fabricated by hand casting of the solution after dissolving N-methyl-2-pyrrolidone of PVC-g-PSS. The obtained cation exchange membranes were characterized by water adsorption ratio, expansion ratio, ion conductivity, ion exchange capacity, vanadium permeability, and tensile strength for using separator of vanadium redox flow battery. The vanadium redox flow battery system with PVC-g-PSS separator during charging and discharging with 1,000 cycles had very higher stability. From these results, the synthesized cation exchange membrane could be used as separator in vanadium redox flow battery system.
Gourav Mishra,Mausumi Mukhopadhyay 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.63 No.-
Novel halloysite nanotubes (HNTs) embedded poly(vinyl chloride) ultrafiltration (UF) membrane (PVC/HNTs) were prepared and examined by FTIR, FEG-SEM-EDX, TEM, and SPM. In PVC/HNTs 1 and PVC/HNTs 2 membrane, HNTs were finely distributed and membrane surface became smooth. Pure water flux of the prepared membrane increased from 127.33 L m−2 h−1 for PVC/HNTs 0 membrane to 212.22 L m−2 h−1 for PVC/HNTs 2 membrane. Flux recovery ratio increased from 77.23% (PVC/HNTs0) to 92.10% (PVC/HNTs2) for BSA and 71.42% (PVC/HNTs0) to 92.16% (PVC/HNTs2) for sewage water. BSA rejection ratio was 93% for PVC/HNTs 2 membrane and the addition of HNTs as fillers increased the maximum tensile strength of the membranes.
가교결합을 기반으로 한 1,4-dimethylpiperazinum chloride을 가교제로서 가진 비수계 바나듐 레독스 흐름 전지용 음이온 교환 membrane의 개발
신성수,최성호 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
최근 몇 년 동안 바나늄 레독스 흐름 전지(Vanadium Redox Flow Battery, VRFB)는 전해용액의 재사용 기능과 설계의 유연성 때문에 에너지 저장 시스템로서 많은 관심을 가져왔다. 현재 사용되는 VRFB는 수계 용매를 사용하여 제한된 전위창을 갖고, 또한, 황산을 사용하기 때문에 전극 및 membrane에 손상을 주어전지의 수명을 짧게 하는 요인이 된다. 이러한 문제점을 해결하기 위하여 비수계 VRFB가 제시되었고 VRFFB의 주요 구성요소 중 하나로써, membrane은 양극, 음극 사이의 separtor로써 기능한다. 몇몇의 상업 음이온 교환 membrane은 유기용매에서 용해되는 성질을 가지고 있기 때문에, 유기용매 상에서 낮은 화학적, 물리적 안정성을 가지고 있다. 그러므로, 이번 연구에서, 비수계 VRFB용 membrane으로 사용하기 위해 poly(vinyl chloride)을 기반으로 한 1,4-dimethylpiperazinum chloride을 가교제로서 비수계 VRFB용 membrane을 제조하였다. 제조된 음이온 교환 membrane은 FT-IR, SEM, XPS, contact angle, and thermal analysis (TGA)을 통해 화학적 구조 및 열적 안정성을 확인하였다. 또한, 제조된 음이온 교환 막은 VRFB에 적용하기 위하여 물리적, 화학적 그리고 전기화학적 특성을 평가하였다.
박정기,이제안,설완호,이용민 한국전기화학회 2006 한국전기화학회지 Vol.9 No.1
A new porous separator based on poly(vinyl chloride) (PVC) / poly(vinylidene fluoride-co-hexafluoropropylene) (P(VdF-co-HFP) / poly(methyl methacrylate) (PMMA) was prepared by a phase inversion method. To enhance mechanical property, the membrane was stretched uniaxially at high temperature. Tensile strength and ionic conductivity were measured for various draw ratios. The tensile strength and ionic conductivity were increased with increasing draw ratio. The tensile strength of the separator reached 52MPa after stretching to draw ratio of 5, and the ionic conductivity of the separator was increased from 1.9 10 4 S/cm to 4.6 10 4 S/cm at 25 C. The stretched separator immersed in liquid electrolyte was electrochemically stable up to 4.7V. The cell based on the stretched separator was maintained at about 99% of the initial discharge capacity after 10th cycle operation at 0.2C rate.
New Separators Based on Non-Polyolefin Polymers for Secondary Lithium Batteries
Seol, Wan-Ho,Lee, Yong-Min,Lee, Jun-Young,Han, Young-Dal,Ryu, Myung-Hyun,Park, Jung-Ki The Korean Electrochemical Society 2007 한국전기화학회지 Vol.10 No.2
New porous separators based on non-polyolefin materials including the blend of poly (vinyl chloride) (PVC)/poly (vinylidene fluoride-co-hexafluoropropylene) (P(VdF-co-HFP)/poly(methyl methacrylate) (PMMA), and the porous separator based on poly (vinylidene fluoride) (PVdF) were prepared by phase inversion method. The porosity and morphology were controlled with phase inversion rate, which is governed by the relative content of non-solvent and solvent in coagulation bath. To enhance tensile strength, the solvent pre-evaporation and uni-axial stretching processes were applied. The ionic conductivity was increased with increasing stretching ratio, and tensile strength was increased with increasing solvent pre-evaporation time and stretching ratio. The 200% stretched PVdF separator showed 56 MPa of tensile strength, and the ionic conductivity of the stretched PVdF separator was $8.6{\times}10^{-4}\;S\;cm^{-1}\;at\;25^{\circ}C$.
Polymeric Membrane Cesium-Selective Electrodes Based on Quadruply-bridged Calix[6]arenes
최은미,오혜진,고승화,최용국,남계춘,전승원,Choe, Eun Mi,O, Hye Jin,Go, Seung Hwa,Choe, Yong Guk,Nam, Gye Chun,Jeon, Seung Won Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.12
New quadruply-bridged calix[6]arenes (I-V) have been studied as cesium selective ionophores in poly(vinyl chloride) (PVC) membrane electrodes. PVC membranes were prepared with dioctyl sebacate (DOS) or 2-nitrophenyl octyl ether (o-NPOE) as the sol vent mediator and potassium tetrakis(p-chlorophenyl)borate as the lipophilic salt additive. These ionophores produced electrodes with near-Nernstian slope. The selectivity coefficients for cesium ion with respect to alkali, alkaline earth and ammonium ions have been determined. The lowest detection limit (logaCs+ = -6.3) and the higher selectivity coefficient (logkpotCs+,Rb+ = -2.1 by SSM, -2.3 by FIM for calix[6]arene I) for Cs+ have been obtained for membranes containing quadruply-bridged calix[6]arenes (I, Ⅱ, Ⅲ), which have no para t-butyl substituents on the bridging benzene ring.
New Separators Based on Non-Polyolefin for Secondary Lithium Batteries
박정기,설완호,이용민,이준영,한영달,류명현 한국전기화학회 2007 한국전기화학회지 Vol.10 No.2
New porous separators based on non-polyolefin materials including the blend of poly (vinyl chloride)co-HFP)/poly(methyl methacrylate) (PMA), and theporous separator based on poly (vinylidene fluoride) (PVdF) were prepared by phase inversion method. The porosityand morphology were controlled with phase inversion rate, which is governed by the relative content of non-solventand solvent in coagulation bath. To enhance tensile strength, the solvent pre-evaporation and uni-axial stretching pro-cesses were applied. The ionic conductivity was increased with increasing stretching ratio, and tensile strength wasincreased with increasing solvent pre-evaporation time and 56 MPa of tensile strength, and the ionic conductivity of the stretched PVdF separator was 8.6