Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Interactions and Ionic Conductivities of Poly(epichlorohydrin) Graft Copolymer Electrolyte Membranes

Poly(epichlorohydrin) 가지형 공중합체 전해질막의 상호작용 및 이온 전도도

  • Koh, Joo-Hwan (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Lee, Kyung-Ju (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Park, Jung-Tae (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Ahn, Sung-Hoon (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Kim, Jong-Hak (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 고주환 (연세대학교 화공생명공학과) ;
  • 이경주 (연세대학교 화공생명공학과) ;
  • 박정태 (연세대학교 화공생명공학과) ;
  • 안성훈 (연세대학교 화공생명공학과) ;
  • 김종학 (연세대학교 화공생명공학과)
  • Received : 2010.08.17
  • Accepted : 2010.09.08
  • Published : 2010.09.30
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Abstract

Amphiphilic graft copolymers based on poly(epichlorohydrine) (PECH) were synthesized using atom transfer radical polymerization (ATRP). Successful graft polymerization of poly(methyl methacrylate)(PMMA) and poly(butyl methacrylate) (PBMA) from PECH was confirmed by nuclear magnetic resonance ($^1H$ NMR) and FT-IR spectroscopy. Upon the introduction of KI or LiI to the graft copolymers, the ether stretching bands were shifted to a lower wavenumber due to coordinative interactions. Ionic conductivities of PECH-g-PBMA complexes were always higher than those of PECH-g-PMMA complexes, resulting from higher mobility of rubbery PBMA chains. The maximum ionic conductivity of $2.7{\times}10^{-5}\;S/cm$ was obtained at 10 wt% of KI for PECH-g-PBMA electrolytes.

원자전달 라디칼 중합을 이용하여 poly(epichlorohydrine) (PECH)를 주사슬로 한 양친성 가지형 공중합체를 합성하였다. PECH로부터 poly(methyl methacrylate)(PMMA) 및 poly(butyl methacrylate)(PBMA)의 가지형 중합이 성공적임을 $^1H$ NMR과 FT-IR분석을 통해 확인하였다. 합성한 가지형 공중합체에 KI나 LiI 염을 도입하였을 때, ether 신축진동 피크가 낮은 wavenumber영역으로 이동하였으며, 이는 배위결합 상호작용 때문이다. PECH-g-PBMA 복합체의 이온 전도도는 PECH-g-PMMA 복합체에 비해 항상 높게 나타났는데, 이는 고무상인 PBMA 사슬의 높은 이동성으로부터 기인한 것으로 확인되었다. 최고 이온전도도 값은 질량비 10 wt%의 KI가 도입된 PECH-g-PBMA 전해질체에서 $2.7{\times}10^{-5}\;S/cm$로 나타났다.

Keywords

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