The focus of this study is the relationship between phase behavior and anion conductivity of ion-containing block copolymers as a function of molecular weight, composition and cationic groups. Well-defined polystyrene-b-polychloromethylstyrene block copolymers were synthesized via nitroxide-mediated polymerization method with molecular weights between 2 to 20 kg/mol and mol fractions of chloromethylstyrene (CMS) in the range of 15-40%. The chlorine group of the PCMS block was modified by reacting with either trimethylamine or n-butylimidazole. The results obtained from small-angle X-ray scattering showed lamellar morphologies for most systems. The temperature-dependence of the conductivity was assessed by performing measurements on membranes that were either immersed in water or in a controlled atmosphere at 98% of relative humidity.

Synthesis and characterization of anion conducting block copolymer membranes

243rd National Meeting (2012)

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