Superionic Disulfonic Acid Polymers In article number 2501998, through controlled polymerizations of precisely engineered disulfonic acid monomers with well-defined functional group arrangements, Moon Jeong Park and co-workers simultaneously enhance the mechanical strength and ion transport properties of acid-functionalized polymers. This precise molecular design enables superionic conduction in elastic states, revealing unexpected hydrophobic behavior, and enabling the decoupling of ion relaxation from polymer chain dynamics.