Tailored morphology and ion transport properties of phosphonated polymers by controlling intermolecular interactions
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Ionomers capable of ion transport have been attracting interest for the development of all-solid-state energy systems, operating over a wide temperature window. Creation of percolated ionic channels through the modulated ion agglomeration is a key to achieve the goal, which can be feasible by tailored ion-dipole interactions inside polymer matrices. In the present study, we investigated phosphonic acid ionomers with low acidity, but amphoteric nature and self-dissociation ability unlike sulfonic acid counterparts. Upon chemically bounding the phosphonic acid groups to meta or para of polystyrene backbones, notable alteration in chain conformation and ion clustering behavior were observed owing to the modulated strength of hydrogen bonding interactions. Self-assembled morphologies and morphology-transport relationship were examined to underpin the important role of tuning the position of phosphonic acid group in ionomer structures in improving electrolyte properties.