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Polymers 2015, 7(6), 1046-1065; doi:10.3390/polym7061046

Highly Sulfonated Diamine Synthesized Polyimides and Protic Ionic Liquid Composite Membranes Improve PEM Conductivity

1
Department of Materials Engineering, Kun Shan University, Tainan 710, Taiwan
2
Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 640, Taiwan
3
Institute of Electro–Optical Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan
4
Department of Orthopaedic Surgery, Rothman Institute, Philadelphia, PA 19107, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Scott M. Husson
Received: 17 April 2015 / Revised: 20 May 2015 / Accepted: 28 May 2015 / Published: 8 June 2015
View Full-Text   |   Download PDF [1698 KB, uploaded 8 June 2015]   |  

Abstract

A novel sulfonated diamine was synthesized from 1,4-bis(4-aminophenoxy) benzene [pBAB]. Sulfonated polyimides (SPIs) were synthesized from sulfonated pBAB, 1,4-bis(4-aminophenoxy-2-sulfonic acid) benzenesulfonic acid [pBABTS], various diamines and aromatic dianhydrides. Composite proton exchange membranes (PEMs) made of novel SPIs and a protic ionic liquid (PIL) 1-vinyl-3-H-imidazolium trifluoromethanesulfonate [VIm][OTf] showed substantially increased conductivity. We prepared an SPI/PIL composite PEM using pBABTS, 4,4′-(9-fluorenylidene) dianiline (9FDA) as diamine, 3,3′,4,4′-diphenylsulfone tetracarboxylic dianhydride (DSDA) as dianhydride and 40 wt % [VIm][OTf] with a high conductivity of 16 mS/cm at 120 °C and anhydrous condition. pBABTS offered better conductivity, since the chemical structure had more sulfonated groups that provide increased conductivity. The new composite membrane could be a promising anhydrous or low-humidity PEM for intermediate or high-temperature fuel cells. View Full-Text
Keywords: proton exchange membrane; sulfonated diamine; sulfonated polyimide; ionic liquid; conductivity proton exchange membrane; sulfonated diamine; sulfonated polyimide; ionic liquid; conductivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Chen, B.-K.; Wu, T.-Y.; Wong, J.-M.; Chang, Y.-M.; Lee, H.-F.; Huang, W.-Y.; Chen, A.F. Highly Sulfonated Diamine Synthesized Polyimides and Protic Ionic Liquid Composite Membranes Improve PEM Conductivity. Polymers 2015, 7, 1046-1065.

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