Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
권호 표지

Hydrolytic Stability of Sulfonic Acid-Containing Polyimides for Fuel Cell Membranes

  • Kim Hyoung-Juhn (Fuel Cell Research Center, Korea Institute of Science and Technology) ;
  • Litt Morton H. (Department of Macromolecular Science and Engineering, Case Western Reserve University) ;
  • Shin Eun-Mi (Cable Research Lab., LG Cable Ltd.) ;
  • Nam Sang Yong (Department of Polymer Science and Engineering, Engineering Research Institute, Gyeongsang National University)
  • Published : 2004.12.01
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Abstract

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 (BTFMB27mPl0[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.

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References

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