Abstract
Poly-(vinyl alcohol) (PVA) proton-conducting composite membranes were prepared using succinic acid (SA) as a cross-linking agent and Brønsted acidic ionic liquid (BAIL) as a proton source. The incorporated BAILs resulted in a relatively high proton conductivity compared with PVA/SA membrane without BAILs. The proton conductivities of PVA/SA/BAIL composite membranes increased versus the BAIL content. In addition, the optimal resultant proton conductivity of PVA/SA/BAIL composite membrane under dry condition could reach 0.4 mS/cm at 140 °C, which was higher than that of PVA/sulfosuccinic acid (SSA) composite membrane (0.032 mS/cm), PVA/SSA/5-aminotetrazole membrane (0.022 mS/cm at 130 °C), and PVA/chlorosulfonic acid/glutaraldehyde membrane (0.0585 mS/cm at 90 °C) measured at the same condition. It was notable that the PVA/SA/BAIL composite membranes could reach high thermal stability up to 150 °C, which was higher than that of traditional PVA membranes (below 80 °C).
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Acknowledgments
The authors are grateful to the National Basic Research Program (2013CB834505), specialized Research Fund for the Doctoral Program of Higher Education of China (No. 20120131130003) and the Shandong Provincial Natural Science Foundation, China (ZR2012BZ001).
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Yang, Y., Gao, H., Lu, F. et al. Preparation and characterization of composite membranes with Brønsted acidic ionic liquid. Colloid Polym Sci 292, 2831–2839 (2014). https://doi.org/10.1007/s00396-014-3324-7
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DOI: https://doi.org/10.1007/s00396-014-3324-7