Journal
JOURNAL OF POWER SOURCES
Volume 189, Issue 2, Pages 875-881Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.12.155
Keywords
Sulfonated poly(ether ether ketone ketone)s; Membrane; Fuel cell
Funding
- Changchun Institute of Applied Chemistry
- China High-Tech Development 863 Program [2007AA03Z218]
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A novel series of sulfonated poly(ether ether ketone ketone)s (SPEEKKs) with different degrees of sulfonation (Ds) were synthesized from 1,3-bis(3-sodium sulfonate-4-fluorobenzoyl)benzene (1,3-SFBB-Na), 1,3-bis(4-fluorobenzoyl)benzene (1,3-FBB) and 3,3',5,5'-tetramethyl-4,4'-biphenol (TMBP) by aromatic nucleophilic polycondensation. The chemical structures of SPEEKKs were confirmed by FT-IR spectroscopy and the Ds values of the polymers were calculated by H-1 NMR and titration methods, respectively. The thermal stabilities of the SPEEKKs in acid and sodium forms were characterized by thermogravimetric analysis (TGA), which showed that SPEEKKs had excellent thermal properties at high temperatures. All the SPEEKK polymers were easily solution cast into tough membranes. Water uptakes, proton conductivities and methanol diffusion coefficients of the SPEEKK membranes were measured. Water uptake increased with Ds and temperature. Compared to Nafion, the SPEEKK-60, -70 and -80 membranes showed higher proton conductivities at 80 degrees C, while the other SPEEKK membranes showed relatively lower proton conductivities. This may be due to the different distribution of ion-conducting domains in membrane. However. these membranes showed lower methanol diffusions in the range of 8.32 x 10(-9) to 1.14 x 10(-7) cm(2) s(-1) compared with that of Nafion (2 x 10(-6) cm(2) s(-1)) at the same temperature. The membranes also showed excellent mechanical properties (with a Young's modulus> 1 GPa and a tensile strength > 40 MPa). These results indicate that the SPEEKK membranes are promising materials for use in direct methanol fuel cell (DMFC) applications. (C) 2009 Elsevier B.V. All rights reserved.
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