High-Resolution Solid-State NMR Studies of Poly(vinyl phosphonic acid) Proton-Conducting Polymer: Molecular Structure and Proton Dynamics

摘要: The structure and the local proton mobility of poly(vinyl phosphonic acid) were studied by solid-state NMR under fast magic-angle spinning. At elevated temperatures, signature hydrogen-bonded P−OH protons is observed in 1H spinning (MAS) as a single resonance at 10.5 ppm. Both double-quantum variable-temperature experiments demonstrate that are mobile thus able to contribute conductivity. Below room temperature, two different types resonances 15 ppm, demonstrates these immobile on time scale. By means first-principles calculations model polymer, we have assigned additional species lower temperatures acid anhydride charged anhydride. Also, 31P MAS spectrum, distinct appear, arising from “normal” experi...