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

The proton dynamics of PV and its sulfonated derivatives have been studied using high‐resolution solid state 1 H 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 1 H 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.