Study of the effect of water and free volume fraction enable by various methyl side chain in anion exchange membrane.
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We report the synthesis of poly(aryl ether ketone ketone)s with three type methyl side groups to control the free volume fraction of the polymers. The free volume fraction from the three type methyl groups in the side chains influenced the water uptake, morphology, and ion diffusion rates of the polymers in AEM (anion exchange membrane). Through MD simulations, the pore structure and pore size of the anion exchange membrane were observed to widen or narrow depending on methyl groups in the side chains. Moreover, the formation of water channels and OH- ion transport properties were also investigated. Experimental morphological analyses of AEMs were performed using atomic force microscopy (AFM) and transmission electron microscopy (TEM). The formation of the ion channels was revealed using small-angle X-ray scattering (SAXS) and positron annihilation lifetime spectroscopy (PALS). Along with the other characterizations, the obtained AEMs were proven to be promising candidate for potential fuel cell and water electrolyte application.