Sulfonated poly(arylene ether sulfone) membranes based on biphenol for direct methanol fuel cells

Se Joon Im, Rajkumar Patel, Se Jong Shin, Jong Hak Kim, Byoung Ryul Min

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23 Citations (Scopus)


A series of sulfonated poly(arylene ether sulfone) (PAES) were synthesized through direct aromatic nucleophilic substitution polycondensation of 3,3′-disulfonate-4,4′-dichlorodiphenylsulfone (SDCDPS), 4,4-dichlorodiphenylsulfone (DCDPS) and 4,4-biphenol (BP). With increasing sulfonate groups in the polymer, water uptake, ion exchange capacity (IEC) and proton conductivities increased, resulting from enhanced membrane hydrophilicity. The membranes exhibited higher thermal stability up to 300 °C, verified by thermogravimetric analysis (TGA). A maximum proton conductivity of 0.11 S/cm at 50 mol% of sulfonation degree was measured at 30 °C, which is slightly higher than Nafion®117 membrane (0.0908 S/cm). However, the methanol permeability of the PAES membrane was much lower than that of Nafion®117 membrane. As a result, a single cell performance test demonstrated that PAES-BP with 50 mol% sulfonation degree exhibited higher power density than Nafion®117.

Original languageEnglish
Pages (from-to)732-737
Number of pages6
JournalKorean Journal of Chemical Engineering
Issue number4
Publication statusPublished - 2008 Jul

Bibliographical note

Funding Information:
This work was supported by a Korea Research Foundation Grant (KRF-2005-005-J01402).

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)


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