A series of six-membered sulfonated poly(imide-siloxane)s (SPIs) was synthesized using 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), aminopropyl-terminated polydimethylsiloxane (PDMS) 2,2-benzidinedisulfonic acid (BDSA), as the sulfonation target diamine groups, and various nonsulfonated diamine monomers behaving as bridging groups. The structure-property relationship of SPI-SXx membranes is discussed in detail according to the chemical structure of the various nonsulfonated diamines of the SPI-SXx membranes from the viewpoints of proton conductivity, ion exchange capacity (IEC), and membrane properties (water uptake and membrane swelling) at equal PDMS content SPI-SXx. The PDMS was introduced to enhance the proton conductivity and water uptake attributed from the high flexibility of the siloxane segments. The conductivity and water uptake of angled SPI-SXm and oxydianiline-based SPI-SX membranes (SPI-SXO) are greater than those prepared from diaminodiphenylmethane-based SPI-SX membranes (SPI-SXD) at a given IEC. These differences resulted from the increased number of entanglements of the SPI-SXx membrane. The SPI-SXD showed almost isotropically dimensional changes with the increase in water uptake, and the volume were slightly smaller than those estimated from the additivity rule. Free volume in the SPI-SXx increased with the increase in bulky irregular packing in nonsulfonated segments, which augmented the water uptake and, in turn, the conductivity of the polymer. With the increase in temperature, conductivity increased more rapidly in SPI-SXx than in Nafion 117. Microscopic analyses revealed that these smaller and well-dispersed hydrophilic domains contribute to better proton conducting properties. The new sulfonated poly(imide-siloxane)s have proved to be a possible candidate as the polymer electrolyte membrane for polymer electrolyte fuel cells (PEFCs) and direct methanol fuel cells (DMFCs).
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April 2010
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Effect of Bridging Groups on Sulfonated Poly(imide-Siloxane) for Application in Proton Exchange Membrane
Chi-Hung Lee,
Chi-Hung Lee
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan
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Jia-Ru Chen,
Jia-Ru Chen
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan
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Hung-Wei Shiu,
Hung-Wei Shiu
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan
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Ko-Shan Ho,
Ko-Shan Ho
Department of Chemical and Materials Engineering,
National Kaohsiung University of Applied Sciences
, 415 Chien-Kuo Road, Sanmin District, Kaohsiung City 80778, Taiwan
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Shinn-Dar Wu,
Shinn-Dar Wu
Department of Mechanical Engineering,
National Chiao Tung University
, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan
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Kuo-Huang Hsieh,
Kuo-Huang Hsieh
Institute of Polymer Science and Engineering,
National Taiwan University
, 1 Roosevelt Road, Section 4, Taipei 10617, Taiwan
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Yen-Zen Wang
Yen-Zen Wang
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan
Search for other works by this author on:
Chi-Hung Lee
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan
Jia-Ru Chen
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan
Hung-Wei Shiu
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, Taiwan
Ko-Shan Ho
Department of Chemical and Materials Engineering,
National Kaohsiung University of Applied Sciences
, 415 Chien-Kuo Road, Sanmin District, Kaohsiung City 80778, Taiwan
Shinn-Dar Wu
Department of Mechanical Engineering,
National Chiao Tung University
, 1001 Ta Hsueh Road, Hsinchu 30010, Taiwan
Kuo-Huang Hsieh
Institute of Polymer Science and Engineering,
National Taiwan University
, 1 Roosevelt Road, Section 4, Taipei 10617, Taiwan
Yen-Zen Wang
Department of Chemical and Materials Engineering,
National Yunlin University of Science and Technology
, 123 University Road, Section 3, Douliou, Yunlin 64002, TaiwanJ. Fuel Cell Sci. Technol. Apr 2010, 7(2): 021023 (6 pages)
Published Online: January 25, 2010
Article history
Received:
April 13, 2008
Revised:
January 9, 2009
Online:
January 25, 2010
Published:
January 25, 2010
Citation
Lee, C., Chen, J., Shiu, H., Ho, K., Wu, S., Hsieh, K., and Wang, Y. (January 25, 2010). "Effect of Bridging Groups on Sulfonated Poly(imide-Siloxane) for Application in Proton Exchange Membrane." ASME. J. Fuel Cell Sci. Technol. April 2010; 7(2): 021023. https://doi.org/10.1115/1.3200906
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