Influence of silica content in sulfonated poly(arylene ether ether ketone ketone) (SPAEEKK) hybrid membranes on properties for fuel cell application

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DOIResolve DOI: http://doi.org/10.1016/j.polymer.2006.09.001
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TypeArticle
Journal titlePolymer
Volume47
Issue23
Pages78717880; # of pages: 9
SubjectSulfonated poly(arylene ether ether ketone ketone); Sol–gel process; Proton conductivity
AbstractSulfonated poly(arylene ether ether ketone ketone) (SPAEEKK) copolymer containing pendant sulfonic acid group (sulfonic acid content (SC) = 0.67) was synthesized from commercially available monomers such as sodium 6,7-dihydroxy-2-naphthalenesulfonate (DHNS), 1,3-bis(4-fluorobenzoyl)-benzene (BFBB), and hexafluorobisphenol A (6F-BPA). SPAEEKK/silica hybrid membranes were prepared using the sol–gel process under acidic conditions. The SPAEEKK/silica hybrid membranes were fabricated with different silica contents and the membranes were modified to achieve improved proton conductivity incorporating P–OH groups (H3PO4 treatment). The silica particles within the membranes were used for the purpose of blocking excessive methanol cross-over and for forming a pathway for proton transport due to water absorption onto the hydrophilic triple bond; length of mdashSiOH surface. The proton conductivities of H3PO4-doped membranes were somewhat higher than the un-doped (H3PO4-free) membranes due to increasing hydrophilicity of the membranes. The presence of silica particles within the organic polymer matrix, which decreases the ratio of free water to bound water due to the triple bond; length of mdashSiOH on the surface of silica derived from sol–gel reaction, results in hybrid membranes with reduced methanol permeability and improved proton conductivity.
Publication date
LanguageEnglish
AffiliationNRC Institute for Chemical Process and Environmental Technology; National Research Council Canada
Peer reviewedNo
NRC number49104
NPARC number8909668
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Record identifier30126e80-e6fb-4afa-bb17-fca2748f80e9
Record created2009-04-22
Record modified2016-05-09
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