Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Preparation of Proton Conducting Anhydrous Membranes Using Poly(vinyl chloride) Comb-like Copolymer

Poly(vinyl chloride) 빗살형 공중합체를 이용한 무가습 수소이온 전도성 전해질막의 제조

  • Kim, Jong-Hak (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Koh, Joo-Hwan (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Seo, Jin-Ah (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Ahn, Sung-Hoon (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Zeng, Xiaolei (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 김종학 (연세대학교 화공생명공학과) ;
  • 고주환 (연세대학교 화공생명공학과) ;
  • 서진아 (연세대학교 화공생명공학과) ;
  • 안성훈 (연세대학교 화공생명공학과) ;
  • 증효뢰 (연세대학교 화공생명공학과)
  • Published : 2009.06.30
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Abstract

A comb-like copolymer consisting of a poly(vinyl chloride) backbone and poly(hydroxy ethyl acrylate) side chains, i.e. PVC-g-PHEA, was synthesized through atom transfer radical polymerization (ATRP). This comb-like copolymer was crosslinked with 4,5-imidazole dicarboxylic acid (IDA) via the esterification of the -OH groups of PHEA in the graft copolymer and the -COOH groups of IDA. Upon doping with phosphoric acid (PA, $H_3PO_4$) to form imidazole-PA complexes, the proton conductivity of the membranes continuously increased with increasing PA content. A maximum proton conductivity of 0.011 S/cm was achieved at $100^{\circ}C$ under anhydrous conditions. The PVC-g-PHEA/IDA/PA complex membranes exhibited good mechanical properties, i.e. 575 MPa of Young's modulus, as determined by a universal testing machine (UTM). Thermal gravimetric analysis (TGA) shows that the membranes were thermally stable up to $200^{\circ}C$.

Poly(vinyl chloride) (PVC) 주사슬과 poly(hydroxyethyl acrylate) (PHEA) 곁사슬로 구성된 빗살모양의 PVC-g-PHEA 공중합체를 원자전달라디칼 중합을 통해 합성하였다. 이렇게 합성된 PVC-g-PHEA의 OH 그룹과 이미다졸 디카르복실릭산 (IDA)의 COOH 그룹과의 에스테르 반응에 의하여 가교된 전해질막을 제조하였다. 인산(PA)을 도핑하여 이미다졸-인산 착체를 형성한 결과, PA함량이 증가함에 따라 고분자 전해질막의 수소 이온 전도도가 증가하였다. 특히 100도 비가습 조건에서 수소 이온 전도도는 최대 0.011 S/cm까지 증가하였다. 만능 재료 시험기(UTM) 측정결과, 제조된 PVC-g-PHEA/IDA/PA 전해질막은 575 MPa의 높은 Young 모듈러스 및 기계적 강도를 보여주었다. 열분석 결과(TGA) 전해질막은 $200^{\circ}C$까지 열적으로 안정함을 확인하였다.

Keywords

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