Determination of hydrazide content in poly(oxadiazole-hydrazide) copolymers by NMR and thermal analysis

Preparation and characterization of sulfonated poly(1,3,4-oxadiazole)/multi-walled carbon nanotube composite films with high performance in electric heating and thermal stability

“…1A) were detected in the range of 8.5e8.7, 8.3e8.2, and 7.5e7.3. The appearance of these addition peaks is believed to be caused by the presence of sulfonate group on the phenylene rings, which was found to be consistent with the spectrum reported in literature [22]. The presence of the sodium sulfonate group was also identified from an EDS spectrum, as shown in Fig.…”

Preparation and evaluation of sulfonated polyoxadiazole membrane containing phenol moiety for PEMFC application

“…Because of the high affinity to water absorption, the wide signal at 2000-3700 cm −1 became wider and more intensive than SPPOD and SCDPPOD. The branching and degradation of diphenyl ether C-O-C bond catalyzed by acid at high temperature which lead to the phenoxy terminated segment formation has been previously reported in literatures [57,[60][61][62]. Also, at high temperatures, protonated oxadiazole groups are degraded and suffer from cleavage, analogous to the mechanism proposed by Franski et al [61].…”

Polymer electrolyte based on chemically stable and highly conductive alkali-doped polyoxadiazole for direct borohydride fuel cell

“…This sharp decline corresponds to the decomposition of polymer main chain. According to previous reports [14], incomplete cyclization could possibly occur during the synthesis process, producing residual hydrazide groups. In comparison to the conjugated oxadiazole ring, the hydrazide group is considered to be less stable, and its decomposition occurs in the temperature range of 200-450°C [15].…”