Acidity effects of medium fluids on anhydrous proton conductivity of acid-swollen block polymer electrolyte membranes.

ABSTRACT: Proton-conductive polymer electrolyte membranes (PEMs) were prepared by infiltrating sulfuric acid (Sa) or phosphoric acid (Pa) into a polystyrene-b-poly(4-vinylpyridine)-b-polystyrene (S-P-S) triblock copolymer. When the molar ratio of acid to pyridyl groups in S-P-S, i.e., the acid doping level (ADL), is below unity, the P-block/acid phase in the PEMs exhibited a moderately high glass transition temperature (T _g) of ∼140 °C because of consumption of acids for forming the acid-base complexes between the pyridyl groups and the acids, also resulting in almost no free protons in the PEMs; therefore, the PEMs were totally glassy and exhibited almost no anhydrous conductivity. In contrast, when ADL is larger than unity, the T _gs of the p

SUBMITTER: Kajita T 

PROVIDER: S-EPMC9033556 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature