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Polysulfone ionomers for proton-conducting fuel cell membranes: sulfoalkylated polysulfones

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Author

Summary, in English

Polysulfones (PSUs) carrying short pendant alkyl side-chains with terminal sulfonic acid units have been prepared and studied as proton-conducting membrane materials. The first step in the preparation involved quenching of lithiated PSU with SO2 gas, resulting in sulfinated PSU. In the second step, the lithium sulfinate units on the polymer were reacted with sodium 2-bromoethanesulfonate, sodium 3-bromopropanesulfonate, or 1,4-butane sultone to produce sulfoethylated, sulfopropylated, or sulfobutylated PSUs, respectively. Analysis by thermogravimetry showed that membranes based on the sulfoalkylated polymers were stable up to approximately 300degreesC under N-2 atmosphere. Calorimetry measurements revealed that the modified polymers absorbed large amounts of non-freezing water, corresponding to 11-14 mol H2O/mol SO3H under immersed conditions. The proton conductivity of a membrane based on a PSU carrying 0.9 sulfopropyl chains per repeating unit was measured to be 77 mS/cm at 70degreesC under humidifying conditions. (C) 2003 Elsevier B.V. All rights reserved.

Publishing year

2004

Language

English

Pages

61-70

Publication/Series

Journal of Membrane Science

Volume

230

Issue

1-2

Document type

Journal article

Publisher

Elsevier

Topic

  • Chemical Sciences

Keywords

  • Ion exchange membrane
  • Polysulfone
  • Water absorption
  • Sulfonation
  • Proton conducting electrolyte

Status

Published

ISBN/ISSN/Other

  • ISSN: 0376-7388