Abstract
In order to reduce water uptake, swelling ratio, and methanol permeability in sulfonated proton exchange membranes (PEM), novel-sulfonated aromatic poly(ether ether nitrile)s-bearing pendant propenyl groups had been synthesized by direct copolymerization method. All the results showed that the propenyl groups were suitable cross-linkable groups, and that this method was an effective way to overcome the drawbacks of sulfonated polymers at high ion exchange capacity (IEC) values. By cross-linking, the water uptake, swelling ratio, and methanol diffusion could be restricted owing to the formation of compact network structure. For example, CSPEN-60 membranes showed the proton conductivity of 0.072 S cm−1 at 80 °C, while the swelling ratios and water uptake (17.9 and 60.7 %) were much lower than that of the SPEN-60 membrane (60.8 and 295.2 %). Meanwhile, a 1.1 × 10−7 cm2 s−1 of methanol diffusion was obtained which was much lower than that of Nafion 117 (14.1 × 10−7 cm2 s−1). Although the proton conductivity of the CSPEN-60 membranes is lower than that of the SPEN-60 membrane, the selectivity is much higher. The CSPEN-60 membrane exhibited the highest selectivity among the tested membranes, about 5.8 times higher compared with that of Nafion117.
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Acknowledgments
The authors gratefully thank the financial support from the National Natural Science Foundation of China (Project No. 51373028, No. 51403029), the “863” National Major Program of High Technology (2012AA03A212), South Wisdom Valley Innovative Research Team Program, and Ningbo Major Science and Technology Research Plan (2013B06011).
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Penglun Zheng and Mingzhen Xu contributed equally to this work.
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Zheng, P., Xu, M., Liu, X. et al. Novel cross-linked membrane for direct methanol fuel cell application: sulfonated poly(ether ether nitrile)s. Ionics 23, 87–94 (2017). https://doi.org/10.1007/s11581-016-1805-z
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DOI: https://doi.org/10.1007/s11581-016-1805-z