Authors
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Mistri, E. A. ; Banerjee, S. ; Komber, H. ; Voit, B.
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Title
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Structure-property correlation of semifluorinated 6-membered co-SPIs for proton exchange membrane
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Date
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01.12.2015
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Number
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47385
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Abstract
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This article reports the synthesis, characterization and proton exchange membrane (PEM) properties of four new structurally different naphthalenetetracarboxylic dianhydride (NTDA)-based semifluorinated sulfonated copolyimides (co-SPIs) containing heterocyclic groups as well as phenyl ring with various catenation angles. To understand the structure–property correlation, the co-SPIs were prepared with a fixed sulfonation degree (70%, IEC ~ 2.1) by using the fixed molar feed ratio of sulfonated diamine to the different non-sulfonated diamines. The structures of the different co-SPIs, namely, p-DTN70, m-DTN70, DPyN70, and DThN70 were confirmed by FTIR and NMR spectroscopy. All the co-SPIs showed high thermal stability for 5% weight loss temperature (290–300 °C) in synthetic air. Transparent, flexible and membranes were prepared from the co-SPIs that showed tensile strength in the range of 50–65 MPa and Young`s modulus values in the range of 1.6–1.84 GPa in wet condition. It was noticed that the dimensional and oxidative stability were higher for para-connecting co-SPI membrane (p-DTN70) than for meta-connecting membranes (m-DTN70, DPyN70 and DThN70). Whereas, the proton conductivity was found highest for meta-connecting m-DTN70 membrane (s = 79.2 mS/cm at 90 °C) due to the higher water uptake and better phase separated morphology of the membrane as observed by transmission electron microscopy analysis.
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Publisher
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European Polymer Journal
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Wikidata
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Citation
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European Polymer Journal 73 (2015) 466-479
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DOI
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https://doi.org/10.1016/j.eurpolymj.2015.11.006
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Tags
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semifluorinated sulfonated polyimides proton exchange properties structure–property correlation
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