Effects of naphthoxy side groups on functionalities of linear polyphosphazenes: Fluorescence, ion response and degradability

Wu, Shaojun; Lin, Husitu; Zhang, Shuangkun; Liu, Wei; Liu, Jianjun; Wu, Zhanpeng; Wu, Dezhen

doi:10.1016/j.polymer.2020.122251

Cited by 6 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The absorption peaks at 1154 and 970 cm –1 were consistent with P–O–C stretching vibration . The absorption peaks at 800 cm –1 can be ascribed to the absorption peak on the β-substituted naphthalene ring . The peak at 1210 cm –1 was identified as the absorption peak of PN.…”

Section: Resultsmentioning

confidence: 71%

“…For SPNPP, there were obvious peaks at 19.6 and 20.9°, which were the characteristic absorption peaks of SPNPP, corresponding to the short-range order with an amorphous structure. There was still an obvious diffuse reflection peak between 15 and 25° . The diffuse reflection peaks of cCM-mPBI/SPNPP indicated that SPNPP was evenly distributed in cCM-mPBI/SPNPP composite membranes and there was no crystal structure.…”

Section: Resultsmentioning

confidence: 99%

“…27 The absorption peaks at 800 cm −1 can be ascribed to the absorption peak on the βsubstituted naphthalene ring. 38 The peak at 1210 cm −1 was identified as the absorption peak of P�N. The absorption peak of P−N on the main chain of polyphosphazene was observed at 740 cm −1 .…”

Section: Ft-ir and Nmrmentioning

confidence: 97%

“…There was still an obvious diffuse reflection peak between 15 and 25°. 38 The diffuse reflection peaks of cCM-mPBI/SPNPP indicated that SPNPP was evenly distributed in cCM-mPBI/SPNPP composite membranes and there was no crystal structure. The XRD results confirmed good compatibility between SPNPP and chloromethylated mPBI, which is beneficial for proton conductivity.…”

Section: Ft-ir and Nmrmentioning

confidence: 97%

See 3 more Smart Citations

Sulfonated Polyphosphazene-Blended Self-Cross-Linked Polybenzimidazole-Based High-Temperature Proton Exchange Membranes: High Efficiency in Proton Transport at Low Humidity

Cui

Sun

et al. 2022

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Polybenzimidazole (PBI) and polyphosphazene derivatives show favorable thermal stability in proton exchange membrane applications. Selfcovalent cross-linked chloromethylated polybenzimidazole (cCM-mPBI) is blended with sulfonated polynaphthoxyphosphazene (SPNPP) at varying weight ratios for preparation of high-temperature proton exchange membranes. The structure and properties are studied using infrared spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy. Results indicate that the self-covalent cross-linking structure improves the mechanical properties of the composite membranes and facilitates formation of a greater level of ionic and hydrogen bonds. The high content of sulfonic acid groups of SPNPP, good compatibility with CM-mPBI, more alkaline sites exposed by self-cross-linking, the exemption of nonconductive cross-linking agents, and a more compact hydrogen bond network have a synergistic effect on making the composite membrane exhibit good proton conductivity. The proton conductivity at an SPNPP doping level of 40 wt % is 0.152 S cm −1 at 170 °C and 100% relative humidity (RH). More importantly, the cCM-mPBI/SPNPP (40%) membrane also shows high proton transport efficiency at lower RH values of 50 and 0% with proton conductivities of 0.075 and 0.042 S cm −1 , respectively. The results show that cCM-mPBI/SPNPP is a promising material to be applied as a high-temperature proton exchange membrane.

show abstract

Section: Resultsmentioning

confidence: 71%

Section: Resultsmentioning

confidence: 99%