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Sulfonated poly(ether sulfone)s containing pyridine moiety for PEMFC.

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    Journal of Nanoscience and Nanotechnology
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    Summary

    New sulfonated poly(ether sulfone) membranes exhibit tunable properties for proton exchange applications. These pyridine-based polymers show promising water uptake and proton conductivity, approaching Nafion performance.

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    Area of Science:

    • Polymer Chemistry
    • Materials Science
    • Electrochemistry

    Background:

    • Poly(ether sulfone)s (PES) are versatile polymers with potential in membrane applications.
    • Sulfonation enhances the properties of PES for applications like proton exchange membranes (PEMs).
    • Pyridine-based poly(ether sulfone)s (PPES) offer a unique backbone structure for property modification.

    Purpose of the Study:

    • To synthesize and characterize sulfonated pyridine-based poly(ether sulfone) (PPES) copolymers.
    • To investigate the effect of varying the degree of sulfonation (DS) on membrane properties.
    • To evaluate the potential of these novel membranes as alternatives in proton exchange applications.

    Main Methods:

    • Synthesis of PPES copolymers via direct polycondensation.
    • Post-sulfonation of PPES using concentrated sulfuric acid to control DS.
    • Characterization using 1H NMR spectroscopy and thermogravimetric analysis (TGA).
    • Evaluation of water uptake (WU), ion exchange capacity (IEC), and proton conductivity.

    Main Results:

    • PPES copolymers with varying DS were successfully synthesized and characterized.
    • Water uptake ranged from 17-58%, comparable to Nafion 211 (28%).
    • Proton conductivities were measured between 65-95 mS/cm, approaching Nafion 211 (103 mS/cm).

    Conclusions:

    • The degree of sulfonation significantly influences the properties of PPES membranes.
    • The synthesized sulfonated PPES membranes demonstrate potential for proton exchange applications.
    • These materials offer a tunable alternative to conventional PEMs with competitive performance.