Abstract
Dimethyl 5-sulfoisophthalate sodium salt (DMSIP)-co-diethylene glycol (DEG)-co-maleic anhydride (MA)/phthalic anhydride (PA) oligomers were synthesized via condensation reaction and the corresponding membranes were prepared by UV curing. The number-average molecular weight (Mn) of the DMSIP-co-DEG-co-MA/PA (DDMP) was proportional to the concentration of DMSIP and ranged from 1,360–2,856 g/mol. A successful introduction of a -SO3Na group to the main oligomer chain was confirmed using Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopy and the thermal stability of the membranes up to 300 °C was analyzed using thermogravimetric analysis (TGA). The water uptake values, swelling ratios, and the ion-exchange capacities of the membranes were 13%–30%, 7%–15%, and 0.7–0.9 meq/g, respectively. The electrical properties of the membrane, including the area resistance, ion transport number, and the cyclic charge-discharge current were also analyzed; these properties confirmed that these membranes were suitable for use in redox flow battery (RFB) applications.
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Kwak, NS., Sim, J.B. & Hwang, T.S. Synthesis and characteristics of UV curable dimethyl 5-sulfoisophthalate sodium salt-co-diethylene glycol with maleic and phthalic anhydride copolymers (DMSIP-co-DEG-co-MA/PA) for application in redox flow batteries. Macromol. Res. 21, 941–948 (2013). https://doi.org/10.1007/s13233-013-1115-5
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DOI: https://doi.org/10.1007/s13233-013-1115-5