A series of novel oxidation and water stable sulfonated polyimides (SPIs) were synthesized from 4,4'-binaphthyl-1,1',8,8'-tetracarboxylic dianhydride (BTDA), and wholly aromatic diamine 2,2'-bis(3-sulfobenzoyl) benzidine (2,2'-BSBB) for proton exchange membrane fuel cells. These polyimides could be cast into flexible and tough membranes from m-cresol solutions. The copolymer membranes exhibited excellent oxidative stability and mechanical properties due to their fully aromatic structure extending through the backbone and pendant groups. Moreover, all BTDA-based SPI membranes exhibited much better water stability than those based on the conventional 1,4,5,8-naphthalenecarboxylic dianhydride. The improved water stability of BTDA-based polyimides was attributed to its unique binaphthalimide structure. The SPI membranes with ion exchange capacity (IEC) of 1.36-1.90 mequiv g(-1) had proton conductivity in the range of 0.41 x 10(-1) to 1. 12 x 10(-1) S cm(-1) at 20 degrees C. The membrane with IEC value of 1.90 mequiv g(-1) displayed reasonably higher proton conductivity than Nafion((R)) 117 (0.9 x 10(-1) S cm(-1)) under the same test condition and the high conductivity of 0.184 S cm(-1) was obtained at 80 degrees C. Microscopic analyses revealed that well-dispersed hydrophilic domains contribute to better proton conducting properties. These results showed that the synthesized materials might have the potential to be applied as the proton exchange membranes for PEMFCs. (c) 2007 Elsevier B.V. All rights reserved.
机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Einsla, BR
Kim, YS
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机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Kim, YS
Hickner, MA
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机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Hickner, MA
Hong, YT
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机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Hong, YT
Hill, ML
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机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Hill, ML
Pivovar, BS
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机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Pivovar, BS
McGrath, JE
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Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Einsla, BR
Kim, YS
论文数: 0引用数: 0
h-index: 0
机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Kim, YS
Hickner, MA
论文数: 0引用数: 0
h-index: 0
机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Hickner, MA
Hong, YT
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h-index: 0
机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Hong, YT
Hill, ML
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h-index: 0
机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Hill, ML
Pivovar, BS
论文数: 0引用数: 0
h-index: 0
机构:Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA
Pivovar, BS
McGrath, JE
论文数: 0引用数: 0
h-index: 0
机构:
Virginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USAVirginia Polytech Inst & State Univ, Macromol & Interfaces Inst, Blacksburg, VA 24061 USA