Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Anhydrous Polymer Electrolyte Membranes Prepared From Polystyrene-b-Poly (hydroxyl ethyl methacrylate) Block Copolymer

Polystyrene-b-Poly(hydroxyl ethyl methacrylate) 블록 공중합체를 이용한 무가습 고분자 전해질막

  • Kim, Jong-Hak (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Seo, Jin-Ah (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Lee, Do-Kyung (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Roh, Dong-Kyu (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Shul, Yong-Gun (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 김종학 (연세대학교 화공생명공학과) ;
  • 서진아 (연세대학교 화공생명공학과) ;
  • 이도경 (연세대학교 화공생명공학과) ;
  • 노동규 (연세대학교 화공생명공학과) ;
  • 설용건 (연세대학교 화공생명공학과)
  • Published : 2009.12.30
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Abstract

A block copolymer of polystyrene-b-poly (hydroxyl ethyl methacrylate), PS-b-PHEMA, was synthesized via atom transfer radical polymerization (ATRP) and crosslinked with 4,5-imidazole dicarboxylic acid (IDA) via esterification of the -OH groups of PHEMA in the block copolymer and the -COOH groups of IDA. Upon doping with $H_3PO_4$ to form imidazole-$H_3PO_4$ complexes, the proton conductivity of the membranes continuously increased as the content of $H_3PO_4$ increased. In addition, both the tensile strength and the elongation at break increased with IDA content. A proton conductivity of 0.01 S/cm at $100^{\circ}C$ was obtained for the PS-b-PHEMA/IDA/$H_3PO_4$ membrane with [HEMA]:[IDA]:[$H_3PO_4$] = 3:4:4 under anhydrous conditions. All of the PS-b-PHEMA/IDA/$H_3PO_4$ membranes were thermally stable up to $350^{\circ}C$, as revealed by thermal gravimetric analysis (TGA).

원자전달 라디칼 중합을 이용하여 polystyrene-b-poly (hydroxyethyl methacrylate) (PS-b-PHEMA) 블록 공중합체를 합성한 뒤, 블록 공중합체의 -OH 그룹과 이미다졸 디카르복실릭산 (IDA)의 -COOH 그룹과의 에스테르 반응에 의하여 가교된 전해질막을 제조하였다. 인산($H_3PO_4$)을 도핑하여 이미다졸-인산 착체를 형성한 결과, 인산 함량이 증가함에 따라 공중합체 전해질막의 수소 이온 전도도가 계속 증가하였다. 또한 인장강도와 인장률 모두 인산 함량에 따라 증가하였다. 특히 [HEMA]: [IDA]:[$H_3PO_4$] = 3:4:4의 조성을 갖는 PS-b-PHEMA/IDA/$H_3PO_4$ 블록 공중합체 전해질막은 $100^{\circ}C$의 비가습 조건에서 최대 0.01 S/cm의 수소이온 전도도를 나타내었다. 열분석(TGA) 실험을 통하여 전해질막은 $350^{\circ}C$의 고온까지 열적으로 안정함을 확인하였다.

Keywords

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