• Title/Summary/Keyword: 음이온 교환막

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Preparation of an Anion Exchange Membrane Using the Blending Polymer of Poly(ether sulfone) (PES) and Poly(phenylene sulfide sulfone) (PPSS) (폴리에테르설폰-폴리페닐렌설파이드설폰 블렌딩 고분자를 이용한 음이온교환막의 제조)

  • Lee, Kyung-Han;Han, Joo-Young;Ryu, Cheol-Hwi;Hwang, Gab-Jin
    • Membrane Journal
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    • v.29 no.3
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    • pp.155-163
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    • 2019
  • The anion exchange membrane using the blending polymer of poly(ether sulfone) and poly(phenylene sulfide sulfone) was prepared. It was confirmed by EDXS and FT-IR analysis that the prepared anion exchange membrane had the -N- as an anion exchange group. The ionic conductivity in 1 mol/L $H_2SO_4$ aqueous solution was measured. The ionic conductivity of the prepared anion exchange membrane was 0.015~0.083 S/cm, and had a high value compared with AFN and APS as a commercial anion exchange membrane. Permeabilities of the vanadium ions through the prepared anion exchange membrane were tested to evaluate the possibility as a separator in vanadium redox flow battery. Vanadium ion permeation rate in the prepared anion exchange membrane had a low value compared with Nafion 117 as a commercial cation exchange and AFN as a commercial anion exchange membrane.

Preparation and Application of Anion-Exchange Membrane having Low Water-Splitting Capability (저 물분해 특성을 가진 음이온 교환막의 제조 및 응용)

  • Moon-Sung Kang;Yong-Jin Choi;Seung-Hyeon Moon
    • Membrane Journal
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    • v.13 no.1
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    • pp.54-63
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    • 2003
  • The Preparation and electrochemical characterization of anion-exchange membranes containing pyridinium groups were performed. As a result, the pyridinium membranes showed good electrochemical properties, comparable to those of the commercial membranes, with electrical resistance of less than $3.0 {\Xi}cm^2$ in a 0.5 mol $dm^{-3}$ NaCl and high ionic permselectivity (the transport number of $Cl^-$ ions being 0.97). Moreover, water splitting in the membranes containing pyridinium group was about two or three order of magnitude lower than those in the commercial membranes (e.g. AM-1, Tokuyama Crop., Japan) at the same current density because the resonance effedt in the quaternary aromatic pyridinium group contributed to their molecular stability. In addition, the electrodialytic properties of the pyridinium membranes were evaluated in a semi-pilot scale.

Study on the Preparation of Polyvinyl Chloride Anion Exchange Membrane as a Separator in the Alkaline Water Electrolysis (알칼리 수전해용 격막으로서 폴리염화비닐(polyvinyl chloride) 음이온교환막의 제조에 관한 연구)

  • Park, Jong-Ho;Bong, Soo-Yeon;Ryu, Cheol-Hwi;Hwang, Gab-Jin
    • Membrane Journal
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    • v.23 no.6
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    • pp.469-474
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    • 2013
  • An anion exchange membrane was prepared for a separator in the alkaline water electrolysis. An anion exchange membrane was prepared by the chloromethylation and amination of polyvinyl chloride (PVC) used as a base polymer. The membrane properties of the prepared anion exchange membrane such as the membrane resistance and ion exchange capacity were measured. The minimum membrane resistance of the prepared anion exchange membrane was $2.9{\Omega}{\cdot}cm^2$ in 1M NaOH aq. solution. This membrane had 2.17 meq./g-dry-membrane and 43.4% for the ion exchange capacity and water content, respectively. The membrane properties of the prepared anion exchange membrane was compared with that of the commercial anion exchange membrane. The membrane resistance decreased in the order; AHT>IOMAC> Homemade membrane> AHA>APS=AFN. The ion exchange capacity decreased in the order; Homemade membrane>AFN>APS>AHT>AHA>IOMAC.

Synthesis and Characterization of Vinylbenzyl Chloride-co-Styrene-co-Hydroxyethyl Acrylate (VBC-co-St-co-HEA) Anion-Exchange Membrane for All-Vanadium Redox Flow Battery (전바나듐계 레독스-흐름 전지용 Vinylbenzyl Chloride-co-Styrene-co-Hydroxyethyl Acrylate (VBC-co-St-co-HEA) 음이온교환막의 합성 및 특성)

  • Baek, Young-Min;Kwak, Noh-Seok;Hwang, Taek-Sung
    • Polymer(Korea)
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    • v.35 no.6
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    • pp.586-592
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    • 2011
  • In this study, we synthesized vinylbenzyl chloride-co-styrene-co hydroxyethyl acrylate (VBC-co-St-co-HEA) copolymer that can be applied to redox the flow battery process. The anion exchange membrane was prepared by the amination and crosslinking of VBC-co-St-co-HEA copolymer. The chemical structure and thermal properties of VBC-co-St-co-HEA copolymer and aminated VBC-co-St-co-HEA(AVSH) membrane were characterized by FTIR, $^1H$ NMR, TGA, and GPC analysis. The membrane properties such as ion exchange capacity(IEC), electrical resistance, ion conductivity and efficiency of all-vanadium redox flow battery were measured. The IEC value, electrical resistance, and ion conductivity were 1.17 meq/g, $1.9{\Omega}{\cdot}cm^2$, 0.009 S/cm, respectively. The charge-discharge efficiency, voltage efficiency and energy efficiency from all-vanadium redox flow battery test were 99.5, 72.6 and 72.1%, respectively.

Membrane Potential across Porous Anion-Exchange Membranes in Electrolyte Solution (전해질용액에서의 다공성 음이온교환막을 통한 막전위)

  • ;;Kiyono, Ryotaro;Tasaka, Masayasu
    • Proceedings of the Membrane Society of Korea Conference
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    • pp.21-22
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    • 1997
  • 최근의 이온교환막은 종래의 양이온교환막의 표면에 polycation 등의 얇은 층을 덧붙인 다층막(multi-layer membrane)의 형태가 많이 이용되고 있으며, 정전기적 반발력의 차 등을 이용하여 원자가가 다른 이온들간의 투과성에 차를 부여하기 위하여 이용되고 있다. 이 때문에 polycation막을 통한 1가 이온과 2가 이온의 투과성을 연구하는 것은 우수한 이온교환막을 제작하는것 이상으로 중요하다. 본 연구에서는 고정전하농도(fixed charge density, $\Phi$ X)가 낮은 다공성 저전하음이온교환막을 제작하여, 양측에 대이온(counterion)은 같고 복이온(co-ion)이 다른 전해질용액을 두었을 경우에 관찰되는 막전위를 측정하였다. 이를 토대로 음이온교환막을 통한 막전위의 농도의존성에 관하여 검토하였으며, 비평형열역학(non-equilibrium thermodynamies)에 기초한 이론적 모델을 도입하여 실험치와 비교, 해석하였다.

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The Preparation and Electrochemical Properties of Pore-filled and Polystyrene-based Anion-exchange Membranes Using Poly(ethylene glycol)methyl Ether Methacrylate (Poly(ethylene glycol)methyl Ether Methacrylate를 이용한 세공충전 폴리스티렌계 음이온 교환막의 제조 및 전기화학적 특성)

  • Mun, Hye Jin;Choi, Jae Hak;Hong, Young Taik;Chang, Bong Jun
    • Membrane Journal
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    • v.25 no.6
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    • pp.515-523
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    • 2015
  • While commercial polystyrene-based ion exchange membranes have simple manufacturing processes, they also possess poor durability due to their brittleness. Poly(ethylene glycol)methyl ether methacrylate with hydrophilic side chains of poly(ethylene glycol) was used as a co-monomer to make the membranes have improved flexibility. Hydrophilicity/hydrophobicity of the anion exchange membranes were able to be adjusted by varying the chain lengths of the poly(ethylene glycol). For the preparation of the anion exchange membranes, a porous PE substrate was immersed into monomer solutions and thermally polymerized. The prepared membranes were subsequently reacted with trimethylamine to produce anion exchange functional groups, Quaternary ammonium salts. The prepared pore-filled anion exchange membranes were evaluated in terms of ion exchange capacity, electric resistance, elongation at break and water uptake.

Synthesis and Functionalized Conditions of Quaternized Poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene) Anion Exchange Membrane (질산성 질소 제거용 Quaternized Poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene) 음이온교환막 제조와 관능화 조건)

  • Oh, Chang Min;Hwang, Taek Sung
    • Polymer(Korea)
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    • v.39 no.1
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    • pp.157-164
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    • 2015
  • In this study, we synthesized poly(vinylimidazole-co-trifluoroethylmethacrylate-co-divinylbenzene) (PVTD) copolymer and introduced functional group through quaternization reaction for removing nitrate from drinking water. Also, optimizing conditions (reaction time, reaction temperature and functionalized agents concentration) for introducing the functional group were confirmed. The basic properties such as water uptake, swelling ratio, electrical resistance, ion exchange capacity and anion permselectivity for removing nitrate from drinking water were measured. The optimal values of water uptake, electrical resistance and ion exchange capacity of synthesized anion exchange membrane were 51.2%, $5.4{\Omega}{\cdot}cm^2$, and 1.04 meq/g, respectively.

Synthesis and Properties of Nonfluoro Aminated Poly(vinylbenzyl chloride-co-ethyl methacrylate-co-styrene) Anion Exchange Membranes for MCDI Process (막 축전식 탈염용 비불소계 아민화 Poly(vinylbenzyl chloride-co-ethyl methacrylate-co-styrene) 음이온교환막의 합성 및 특성)

  • Koo, Jin-Sun;Kwak, Noh-Seok;Hwang, Taek-Sung
    • Polymer(Korea)
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    • v.36 no.5
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    • pp.564-572
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    • 2012
  • A terpolymer of vinylbenzyl chloride-co-ethyl methacrylate-co-styrene (VBC-EMA-St) was prepared for membrane capacitive deionization (MCDI) by radical polymerization and amination reaction of various amination times. Nonfluoro aminated VBC-EMA-St anion-exchange membranes were characterized by Fourier transform infrared (FTIR) spectrometry. Molecular weight, polydispersity and thermal stability were obtained by gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). The basic properties such as water uptake, ion exchange capacity, electrical resistance and CDI charge-discharge current were measured. The optimal values of ion exchange capacity, water uptake, electrical resistance and molecular weight of synthesized anion-exchange membrane were 1.69 meq/g, 23.7%, 1.61 ${\Omega}{\cdot}cm$ and $3.4{\times}10^4$ g/mol, respectively. As compared with conventional membrane, the pattern of cyclic charge-discharge current of synthesized anion-exchange membrane indicated efficient electrosorption and desorption.

Preparation of Anion Exchange Membranes of Cross-linked Poly((vinylbenzyl)trimethylammonium chloride-2-hydroxyethyl methacrylate)/Poly(vinyl alcohol) (가교결합한 Poly((vinylbenzyl)trimethylammonium chloride-2-hydroxyethyl methacrylate)/poly(vinyl alcohol) 음이온 교환막 제조)

  • Kim, Mi-Yang;Kim, Kwang-Je;Kang, Ho
    • Applied Chemistry for Engineering
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    • v.21 no.6
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    • pp.621-626
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    • 2010
  • Anion exchange membranes can be used for reverse electrodialysis for electric energy generation, and capacitive deionization for water purification, as well as electrodialysis for desalination. In this study, anion exchange membranes of poly((vinylbenzyl) trimethylammonium chloride-2-hydroxyethyl methacrylate)/poly(vinyl alcohol) were prepared through the polymerization of (vinylbenzyl)trimethylammonium chloride and 2-hydroxyethyl methacrylate in aqueous poly(vinyl alcohol) solutions, esterification with glutaric acid, and cross-linking reaction with glutaraldehyde. We investigated electrochemical properties for the anion exchange membranes prepared according to experimental conditions. Ion exchange capacity and electrical resistance for the membranes were changed with a variation in the monomer ratio in polymerization. Water uptake and conductivity for the membranes decreased with an increase in the content of glutaric acid in esterification. The change in the time of crosslinking reaction with the formed film and glutaraldehyde affected electrochemical properties such as water uptake, conductivity, or transport number for the membranes. Chronopotentiometry and limiting current density for the anion exchange membranes prepared were measured.

Performance Study of Membrane Capacitive Deionization Installed with Sulfonated Poly(ether ether ketone) and Poly(vinyl amine)/poly(vinyl alcohol) Membranes (Sulfonated Poly(ether ether ketone) 및 Poly(vinyl amine)/poly(vinyl alcohol) 혼합막이 장착된 막결합형 축전식 탈염공정의 성능 연구)

  • Kim, Ka young;Rhim, Ji Won
    • Membrane Journal
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    • v.26 no.1
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    • pp.62-69
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    • 2016
  • In this study, sulfonated poly(ether ether ketone) (SPEEK) as cation exchange membrane and blended and crosslinked poly(vinyl amine) (PVAm) with poly(vinyl alcohol) (PVA) membrane as anion exchange membrane were used and then the performance experiments of the membrane capacitive deionization (MCDI) installed with both membranes were carried out. The newly prepared anion exchange membrane were characterized through water content, ion exchange capacity and FT-IR. The crosslinking time of 3 h to 5 h indicated that the salt removal was reduced from 81.3, 65.7% to 53.8%. The effect of PVAm contents from 40, 60, to 80% on the salt removal was shown 81.3, 75.2 and 37.7%, respectively. As a result, it was concluded that the crosslinking time and the content of PVAm had an influence on the salt removal efficiency.