Fabrication and Characterization of Proton Conductive Membranes Based on Poly(methyl methacrylate-co-maleic anhydride)

Document Type: Research Article

Authors

1 Department of Chemistry, Malek-ashtar University of Technology, Shahin-shahr, 83145/115 I. R., Isfahan, Iran

2 Department of chemistry, Malek Ashtar University of Technology

3 Kermanshah University of Technology

Abstract

In this study, proton conductive composite membranes were produced by using a poly(methylmethacrylate-co-maleic anhydride) (P(MMA-co-MAH)) copolymer and phosphotungstic Acid (PWA) as an additive of the proton conductive agent. P(MMA/MAH) 70/30, 50/50, and 30/70 were synthesized using free radical polymerization reaction. PWA with concentration of 2% was added to improve the performance of proton exchange membranes. Composite membranes of P(MMA30-co-MAH70)/PWA had the highest performance, and this improvement was attributed to the presence of MAH and PWA. By increasing the ratio of MMA:MAH from 30/70 to 70/30, thermal stability, ion exchange capacity and proton conductivity of membranes enhanced up to 310°C, 0.85 meq/g, and 5.77 mS/cm, respectively. Moreover, addition of PWA into the membrane matrix improved the membrane characteristics so that thermal stability, ion exchange capacity and proton conductivity increased to 317°C, 0.98 meq/g, and 14.42 mS/cm. The synthesized copolymer offered the required properties to be used for fabrication of a proton conductive membrane.

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