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Fully aromatic block copolymers for fuel cell membranes with densely sulfonated nanophase domains

Författare:
Publiceringsår: 2011
Språk: Engelska
Sidor: 474-480
Publikation/Tidskrift/Serie: Macromolecular Rapid Communications
Volym: 32
Nummer: 5
Dokumenttyp: Artikel
Förlag: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Ytterligare information: First published online on 29 Dec. 2010

Sammanfattning

Two multiblock copoly(arylene ether sulfone)s with similar block lengths and ion exchange capacities (IECs) were prepared by a coupling reaction between a non-sulfonated precursor block and a highly sulfonated precursor block containing either fully disulfonated diarylsulfone or fully tetrasulfonated tetraaryldisulfone segments. The latter two precursor blocks were sulfonated via lithiation-sulfination reactions whereby the sulfonic acid groups were exclusively placed in ortho positions to the many sulfone bridges, giving these blocks IECs of 4.1 and 4.6 meq·g−1, respectively. Copolymer membranes with IECs of 1.4 meq·g−1 displayed well-connected hydrophilic nanophase domains and had decomposition temperatures at, or above, 300 °C under air. The copolymer with the tetrasulfonated tetraaryldisulfone segments showed a proton conductivity of 0.13 S·cm−1 at 80 °C under fully humidified conditions, and surpassed that of a perfluorosulfonic acid membrane (NRE212) by a factor of 5 at –20 °C over time.

Disputation

Nyckelord

  • Technology and Engineering
  • Chemistry
  • polymer electrolyte fuel cell membranes
  • sulfonations
  • amphiphilic block copolymers
  • ionomers
  • polycondensation

Övriga

Published
Yes
  • ISSN: 1022-1336

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