화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.34, No.2, 137-143, March, 2010
Export Citation
고분자전해질 연료전지용 부분 불소계 설폰화 Poly(biphenylene-co-sulfone)ether 막의 제조와 특성
Preparation and Characteristics of Partially Fluorinated-Sulfonated Poly(biphenylene-co-sulfone)ether Membranes for Polymer Electrolyte Membrane Fuel Cell
박재완1, 2, 장봉준1, 김정훈1, †, 이용택2
  • 1한국화학연구원 환경자원센터
  • 2충남대학교 화학공학과
Jae Wan Park1, 2, Bong-Jun Chang1, Jeong-Hoon Kim1, †, and Yongtaek Lee2
  • 1Environment & Resources Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
  • 2Department of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea
E-mail:
초록
불소 관능기인 perfluorocyclobutane(PFCB)기를 함유하는 설폰화된 부분 불소계 poly(biphenyleneco-sulfone)ether 공중합체(SPBS-X)를 제조하였다. 제조과정은 trifluorovinylether그룹을 양 말단에 포함하는 단량체의 합성, 고리화부가 반응형태의 열중합 그리고 후설폰화(post-sulfonation)의 3단계 합성과정을 통하였다. Trifluorovinylether그룹을 양 말단에 포함하는 biphenyl계와 sulfonyl계 단량체를 합성하였고, biphenyl계의 함량을 20 mol%에서 60 mol%까지 조절하면서 고리화부가 반응형태의 열중합을 통해 랜덤 공중합체가 얻어졌다(PBS-X). 후설폰화는 chlorosulfonic acid(CSA)를 사용하여 수행되었으며, 이를 통해 다양한 설폰화도를 가지는 고분자를 합성하였다. 1H-NMR, 19F-NMR 및 FT-IR 분석을 통하여, 제조된 화합물, 단량체 및 중합체들이 성공적으로 합성되었음을 확인하였다. 상온에서 CSA에 대해 설폰화 활성을 가지는 biphenyl기의 함량이 증가함에 따라 이온교환능력(IEC), 함수율 및 이온전도도가 증가하는 경향을 보였고, SPBS-60의 경우 넓은 온도범위(25∼80 ℃)에서 Nafion®-115보다 높은 이온전도도(80 ℃: 0.08 S/cm at RH 100%)를 나타내었다.
A series of partially fluorinated, sulfonated poly(biphenylene-co-sulfone)ether containing perfluorocyclobutane(PFCB) groups were prepared for fuel cell applications through three synthetic steps: synthesis of trifluorovinylether-terminated monomers, thermal cycloaddition and post-sulfonation. Two kinds of trifluorovinylether-terminated monomers were synthesized and statistically copolymerized via thermal cycloaddition to obtain a series of polymers containing 20-60 mol% of biphenyl units(PBS-X). The post-sulfonation of PBS-X was carried out using chlorosulfonic acid(CSA) to obtain copolymers with various sulfonation levels(SPBS-X). All the synthesized compounds, monomers and polymers were characterized by 1H-NMR, 19F-NMR and FT-IR. It was confirmed that the ion exchange capacity(IEC), water uptake and ion conductivity of SPBS-X increased with the increment of sulfonated biphenyl units. Particularly, SPBS-60 showed higher ion conductivity compared to Nafion®-115 at 25∼80 ℃.
Keywords:sulfonated polymer electrolyte membrane;fluorinated polymer;fuel cell;poly(arylene ether sulfone)
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