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Water‐soluble random copolymer ammonium ionenes with in the range of 17.4 to 20.8 kg mol−1 and various charge densities are synthesized from 1,12‐dibromododecane, N,N,N′,N′‐tetramethyl‐1,6‐hexanediamine, and 1,12‐bis(N,N‐dimethylamino)dodecane. Anion exchange of the bromine counterion forms ionenes with TFSI, TFO, and BF4 anions. The nature of the counteranion and charge density...
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