Fully Aromatic Block Copolymers for Fuel Cell Membranes with Densely Sulfonated Nanophase Domains

Shogo Takamuku, Patrick Jannasch, Peter Brilner Lund

Research output: Contribution to conference without publisher/journalPosterCommunication


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 exclu-
sively placed in ortho positions to the many sulfone bridges, giving these locks IECs of 4.1 and 4.6 meqg1, respectively. Copolymer membranes with IECs of 1.4 meqg1 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 8C under fully humidified conditions,
and surpassed that of a perfluorosulfonic acid membrane (NRE212) by a factor of 5 at –20 °C over time.
Original languageEnglish
Publication dateFeb 2011
Number of pages1
Publication statusPublished - Feb 2011
EventAdvances in Polymer Electrolyte Membrane Fuel Cell Systems 2011 - Asilomar Conference Grounds, Pacific Grove, United States
Duration: 20. Feb 201123. Feb 2011


ConferenceAdvances in Polymer Electrolyte Membrane Fuel Cell Systems 2011
LocationAsilomar Conference Grounds
CountryUnited States
CityPacific Grove

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