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Synthesis and characterization of sulfonated copolyimides via thermal imidization for polymer electrolyte membrane application

Title
Synthesis and characterization of sulfonated copolyimides via thermal imidization for polymer electrolyte membrane application
Authors
Jung, EY[Jung, Eun Young]Chae, B[Chae, Boknam]Kwon, SJ[Kwon, Se Jin]Kim, HC[Kim, Hyun-Chul]Lee, SW[Lee, Seung Woo]
DGIST Authors
Kim, HC[Kim, Hyun-Chul]
Issue Date
2012-05-28
Citation
Solid State Ionics, 216, 95-99
Type
Article
Article Type
Article
Keywords
DegradationEthersFourier Transform Infrared SpectroscopyFT-IR spectroscopyNitrogen CompoundsPolycondensationPolyimidesPolymersProton-Exchange MembraneProton-Exchange MembranesProton ConductivityStructure (Composition)Sulfonated CopolyimideSulfonated PolyimideSulfonated PolyimidesSulfuric AcidThermal Imidization
ISSN
0167-2738
Abstract
A series of soluble copoly(amic acid) precursors were synthesized with varying compositions by the conventional polycondensation of 3,3′,4,4′-biphenyltetracarboxylic anhydride (BPDA) and 3,3′-sulfonyldianiline (SDA) using 4,4′-diaminodiphenyl ether-2,2′-disulfonic acid (ODADS), a sulfonated diamine, as a third component in NMP. The synthesized precursor polymers are soluble in polar aprotic solvents. The chemical structures and inherent viscosities of the copoly(amic acid)s were determined by 1H NMR spectroscopy and viscometry, respectively. The free standing sulfonated copolyimide membranes were fabricated from solutions of the copoly(amic acid)s by a thermal imidization process and subsequent soaking in sulfuric acid solution. The chemical structure and thermal properties of the sulfonated copolyimides in the films were investigated in detail using FT-IR, DSC, and TGA. The sulfonated copolyimides show mainly three-step thermal degradation, with the degradation behavior being independent of the composition. In addition, the properties of the membranes were investigated, including their water uptake (WU), ion exchange capacity (IEC) and proton conductivity. The WU and IEC values of the sulfonated copolyimides were 8.12-38.0% and 0.18-2.05 meq/g, respectively, depending on the composition of the sulfonated diamine, and the proton conductivity of the copolyimides was dependent on the content of the sulfonated diamine. The proton conductivity values of the membranes were lower than that of Nafion 117, although their IEC values were higher. © 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/20.500.11750/2466
DOI
10.1016/j.ssi.2012.03.018
Publisher
Elsevier B.V.
Related Researcher
Files:
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Collection:
Magnetic-Controlled Materials Research Group1. Journal Articles


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