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

✍ Scribed by Gang Ye; Blythe Fortier-McGill; Jason W. Traer; Agata Czardybon; Gillian R. Goward

Publisher: John Wiley and Sons
Year: 2007
Tongue: English
Weight: 274 KB
Volume: 208
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.200700203

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✦ Synopsis

Abstract

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.

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