Phase separation and water channel formation in sulfonated block copolyimide

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DOIResolve DOI: http://doi.org/10.1021/jp105708m
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TypeArticle
Journal titleJournal of Physical Chemistry B
Volume114
Issue37
Pages1203612045; # of pages: 10
AbstractWe compared experimental and simulated data to investigate the phase separation and water channel formation of proton exchange membranes (PEMs) for fuel cell. Sulfonated block copolyimides (SPIs) were adopted as model polymers for experiments and simulations, and Nafion was used as a reference. Nafion and SPIs were observed to have different microscopic structures such as constituent atoms, backbone rigidity, and the locations of sulfonic acid groups, all of which significantly affect phenomenological properties at the macroscopic level such as density, water uptake, and proton conductivity. In particular, SPIs show much weaker microphase separation than Nafion, mainly due to the lower mobility of sulfonic acid groups and the existence of acceptable sites for hydrogen bonding even in hydrophobic segments, which impedes water channel formation for proton transport. As a result, the phase separation behavior and the resulting water channel formation are the major factors affecting macroscopic properties of PEMs such as water uptake and proton transport.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Institute for Chemical Process and Environmental Technology
Peer reviewedYes
NRC number52205
NPARC number16239524
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Record identifier8d7de2db-497c-4114-a4b2-c67045bf8c68
Record created2010-10-20
Record modified2016-05-10
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