멤브레인 (Membrane Journal)

  • 제18권3호
  • /
  • Pages.234-240
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  • 2008
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  • 1226-0088(pISSN)
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  • 2288-7253(eISSN)
한국막학회 (The Membrane Society of Korea)
권호 표지

PS-b-PHEA 디블록 공중합체와 폴리비닐알콜을 이용한 수소이온 전도성 가교형 전해질막의 제조

Preparation of Proton Conducting Crosslinked Membranes From PS-b-PHEA Diblock Copolymer and Poly(vinyl alcohol)

  • Kim, Jong-Hak (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Seo, Jin-Ah (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Roh, Dong-Kyu (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Park, Jung-Tae (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Koh, Joo-Hwan (Department of Chemical and Biomolecular Engineering, Yonsei University) ;
  • Makea, Sanjeev (Department of Chemical and Biomolecular Engineering, Yonsei University)
  • 발행 : 2008.09.30
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초록

폴리스티렌-폴리히드록시에틸 아크릴레이트(PS-b-PHEA) 디블록 공중합체와 폴리비닐알콜(PVA)을 1 : 1 무게비로 블렌딩하여 수소 이온 전도성 가교형 고분자 전해질막을 개발하였다. 특히 술포석시닉산(SA)를 사용하여 디블록 공중합체의 PHEA 블록과 PVA와 가교반응을 시켰고, 이를 FT-IR 분광법을 이용하여 분석하였다. 이온교환능(IEC)은 SA 함량이 증가함에 따라 계속하여 증가하여 0.95 meq/g까지 도달하였고, 이는 전해질막에 이온 그룹수가 증가하기 때문이다. 하지만, 함수율은 SA 함량이 20 wt%까지는 증가하다 그 이상에서는 감소하였다. 또한 수소 이온 전도도도 SA 함량에 따라 증가하여 20 wt% SA농도에서 0.024 S/cm의 최대값을 나타내었다. 함수율과 수소이온전도도의 이러한 경향은 SA 함량이 증가함에 따라 이온 그룹의 수가 증가하는 효과와 가교가 증가하는 효과가 서로 경쟁적으로 일어나기 때문으로 생각된다.

This work demonstrates the preparation of proton conducting crosslinked polymer electrolyte membranes by blending polystrene-b-poly(hydroxyethyl acrylate) (PS-b-PHEA) and poly(vinyl alcohol) (PVA) at 1 : 1 wt ratio. The PHEA block of the diblock copolymer was crosslinked with PVA using sulfosuccinic acid (SA) via the esterification reaction between -OH of membrane and -COOH of SA, as confirmed by FT-IR spectroscopy. Ion exchange capacity (IEC) continuously increased from 0.14 to 0.91 meq/g with increasing concentrations of SA, due to the increasing portion of charged groups in the membrane. In contrast, the water uptake increased up to 20.0 wt% of SA concentration above which it decreased monotonically. The membrane also exhibited a maximum proton conductivity of 0.024 S/cm at 20.0 wt% of SA concentration. The maximum behavior of water uptake and proton conductivity is considered to be due to competitive effect between the increase of ionic sites and the crosslinking reaction according to the SA concentration.

키워드

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