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Multiblock copolymers with highly sulfonated blocks containing di- and tetrasulfonated arylene sulfone segments for proton-exchange membrane fuel cell applications

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Author

Summary, in English

Multiblock copoly(arylene ether sulfone)s with different block lengths and ionic contents are tailored for highly stable and proton conducting electrolyte membranes. Two series of fully aromatic copolymers are prepared by coupling reactions between non-sulfonated hydrophobic precursor blocks and highly sulfonated hydrophilic precursor blocks containing either fully disulfonated diarylsulfone or fully tetrasulfonated tetraaryldisulfone segments. The sulfonic acid groups are exclusively introduced in ortho positions to the sulfone bridges to impede desulfonation reactions, and give the blocks ion exchange capacities (IECs) of 4.1 and 4.6 meq./g, respectively. Solvent cast block copolymer membranes show well-connected hydrophilic nanophase domains for proton transport and high decomposition temperatures above 310 ˚C under air. Despite higher IEC values, membranes containing tetrasulfonated tetraaryldisulfone segments display a markedly lower water uptake than the corresponding ones with disulfonated diarylsulfone segments when immersed in water at 100 ˚C, presumably because of the much higher chain stiffness and glass transition temperature of the former segments. The former membranes have proton conductivities in level of a perfluorosulfonic acid membrane (NRE212) under fully humidified conditions. A membrane with an IEC of 1.83 meq./g reaches above 6 mS/cm under 30% relative humidity at 80 ˚C, to be compared with 10 mS/cm for NRE212 under the same conditions.

Publishing year

2012

Language

English

Pages

129-140

Publication/Series

Advanced Energy Materials

Volume

2

Issue

1

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Chemical Sciences

Keywords

  • ionomer
  • block copolymer
  • polyelectrolyte
  • sulfonation
  • polycondensation
  • water transport
  • fuel cell membrane

Status

Published

ISBN/ISSN/Other

  • ISSN: 1614-6832