Preparation of Re-Dispersible Metal-Oxide Nanocomposite Particles Using Ionomers with Different EW for Enhanced Radical Scavenging Performance

초록

Inorganic free radical scavengers are used to suppress the radical attack and chemical degradation of perfluorosulfonic acid (PSFA) ionomer membranes. However, the commercially available radical scavengers have the shortcomings of nano dispersibility and formation of ionically crosslinked complexes with PSFA chains resulting in aggregation and reduced chemical stability. In this study, a new strategy to synthesize highly dispersible metal oxide-ionomer (MO-I) nanocomposite particles using various equivalent weight (EW) of ionomers, is addressed for obtaining effective radical scavengers which ensure the re-dispersibility and colloidal stability in the ionomer dispersions. The effect of the EW of the ionomer and selection of metal precursors on the solubility of metal precursors in the ionomer solution, the solubility of ionomer in the solvent, re-dispersibility, and colloidal stability of MO-I nanocomposite particles in the ionomer solution were also studied. Under given conditions, it was proved that MO-I nanocomposite particles prepared by using cerium nitrate precursor showed the best radical scavenging performance in the presence of EW800 ionomer solution.

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