화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.12, No.6, 545-552, December, 2004
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Hydrolytic Stability of Sulfonic Acid-Containing Polyimides for Fuel Cell Membranes
Hyoung-Juhn Kim†, Morton H. Litt1, Eun-Mi Shin2, and Sang Yong Nam3
  • Fuel Cell Research Center, Korea Institute of Science and Technology, 39-1 Hawolgok, Seongbuk, Seoul 136-791, Korea
  • 1Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH 44106, USA
  • 2Cable Research Lab., LG Cable Ltd., 555 Hogye, Dongan, Anyang, Gyunggi 431-080, Korea
  • 3Department of Polymer Science and Engineering, Engineering Research Institute, Gyeongsang National University, 900 Gazwa, Jinju 660-701, Korea
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The long-term stability of sulfonic acid-containing polyimides has been investigated. The hydrolytic degradation of homopolyimide and the block copolyimide comprising 27 mol% of 2,2'-bis(trifluoromethyl)benzidine and 9 mol% of m-phenylenediamine (BTFMB27mP10[7/(3+1)]), was quantified through viscosity measurements and FT-IR spectroscopic analyses. The viscosity decrease with respect to time and the degradation rate were similar. The degrees of degradation with respect to time under ambient conditions and at elevated temperature in water were monitored by FT-IR spectroscopy. A new absorption peak was observed at 1786 cm-1, which we corresponds to the presence of anhydride end groups formed by hydrolytic scission of the imide rings.
Keywords:anhydride;FT-IR spectroscopy;hydrolytic degradation;polyimides;sulfonic acid;viscosity
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