Membrane Journal (멤브레인)

The Membrane Society of Korea (한국막학회)
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Effects of Mixed Casting Solvents on Morphology and Characteristics of Sulfonated Poly(aryl ether sulfone) Membranes for DMFC Applications

직접 메탄올 연료전지용 술폰화 폴리아릴에테르술폰 전해질 막의 혼합 캐스팅 용매에 따른 형태 및 특성

  • Hong, Young-Taik (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Park, Ji-Young (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Choi, Jun-Kyu (Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT)) ;
  • Choi, Kuk-Jong (Advanced Materials Synthesis Lab., Chungnam National University) ;
  • Hwang, Taek-Sung (Advanced Materials Synthesis Lab., Chungnam National University) ;
  • Kim, Hyung-Joong (Department of Advanced Materials Engineering, Kongju National University)
  • 홍영택 (한국화학연구원 에너지소재연구센터) ;
  • 박지영 (한국화학연구원 에너지소재연구센터) ;
  • 최준규 (한국화학연구원 에너지소재연구센터) ;
  • 최국종 (충남대학교 화학공학과) ;
  • 황택성 (충남대학교 화학공학과) ;
  • 김형중 (공주대학교 고분자공학과)
  • Published : 2008.12.30
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Abstract

Partially sulfonated poly(aryl ether sulfone) membranes were prepared from the sulfonated sulfone monomer, which was synthesized by a nucleophilic substitution, non-sulfonated monomers and potassium carbonate by a direct polymerization method and a subsequent solution casting technique with mixed solvents of N-methyl-2-pyrrolidone (NMP) and dimethylacetamide (DMAc). To investigate the effect of mixed solvent, the volume ratios of NMP and DMAc were varied in the range of $0{\sim}100%$ and the degrees of sulfonation of the copolymers were fixed as 50%. The surface properties of the resulting membranes were examined by scanning electron microscope (SEM) and atomic force microscope (AFM), and a comparative study of the morphology changes and the physicochemical properties such as proton conductivity and methanol permeability was achieved. It was found that proton conductivities depend on the volume ratio of NMP-DMAc mixed solvents, and the proton conductivity determined at the condition of $25^{\circ}C$ and 100% relative humidity was $1.38{\times}10^{-1}\;S/cm$ for the membrane prepared in the 50:50 v/v-% of NMP : DMAc mixed solvent.

친전자성 치환반응으로 제조된 술폰화 단량체, 비(非)술폰화 단량체 및 탄산칼륨을 이용하는 직접 중합법을 통하여 높은 점도의 술폰화 폴리아릴에테르술폰 공중합체를 합성하고, 이들을 원료로 N-메틸-2-피롤리돈(NMP)과 디메틸아세트아미드(DMAc)의 혼합 용매 상에서 직접 메탄을 연료전지용 고분자 전해질 막을 제조하였다. 막 제조 시의 용매 효과에 주목하여 혼합 용매의 부피 비는 $0{\sim}100%$로 변화시키고 공중합체의 술폰화도는 50%로 고정하였다. 이온 전도도 및 메탄올 투과도 측정을 통하여 최종 전해질 막의 기본 특성을 파악하고, 주사전자현미경 및 원자간력현미경분석을 통한 표면 분석 결과와 비교함으로써 이들의 상관관계를 고찰하였다. 막 제조 시의 용매 혼합 비율을 적절히 조절함에 따라 최종 전해질 막의 이온 전도도를 크게 향상시킬 수 있음이 확인되었는데, $25^{\circ}C$의 100% 가습 환경에서 측정된 수소 이온 전도도는 NMP : DMAc 50:50 부피/부피-%에서 최대 $1.38{\times}10^{-1}\;S/cm$이었다.

Keywords

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