Probing Proton Mobility in Polyvinazene and its Sulfonated Derivatives Using <sup>1</sup>H Solid‐State NMR

AbstractThe proton dynamics of PV and its sulfonated derivatives have been studied using high‐resolution solid state 1H MAS NMR. Variable temperature experiments were used to determine the activation energy for transportation of hydrogen bonded protons, found to be 22 ± 1 kJ · mol−1 for PV and 13 ± 1 kJ · mol−1 for PV–B25. The proton exchange between sulfonic acid group and vinazene ring observed from both variable temperature experiments and 1H EXSY NMR experiments provides a good explanation for this difference. A rotor‐synchronized homonuclear double quantum filter sequence was used to distinguish protons of differing mobilities. A model is proposed to understand the distinct proton mobilities in these materials.magnified image

Probing Proton Mobility in Polyvinazene and its Sulfonated Derivatives Using ¹H Solid‐State NMR Journal Articles