被撤回的出版物: Synthesis and characterization of a novel sulfonated poly (aryl ether ketone sulfone) containing rigid fluorene group for DMFCs applications (Retracted article. See vol. 301, pg. 73, 2023)

A new sulfonated poly (aryl ether ketone sulfone) consisting of rigid fluorene groups (SPAEKS) is synthesized from 3, 3 '-disulfonate-4, 4 '-dichlorodiphenylsulfone, and 9, 9-bis (4-hydroxyphenyl) fluorene by a typical condensation polymerization. The chemical structure of SPAEKS is characterized by H-1-NMR and FTIR spectra. SPAEKS-x membranes have moderate water absorption, swelling rate, good oxidative stability, and excellent thermal stability. The proton conductivity of SPAEKS-x membranes is in the range of 38.5-66.5 mS/cm. In particular, the proton conductivity of SPAEKS-50 membrane is 66.5 mS/cm, which is slightly higher than Nafion117 membrane (63.5 mS/cm) measured under the same conditions. All membranes show much lower methanol permeability and much higher proton selectivity than Nafion 117 membrane. Especially, proton selectivity of SPAEKS-40 membrane (13.8 x 10(4) S s cm(-3)) is about 4 times higher than that of Nafion 117 membrane (3.6 x 10(4) S s cm(-3)).

Automated summary

A new sulfonated poly (aryl ether ketone sulfone) with rigid fluorene groups, SPAEKS, was synthesized using typical condensation polymerization. The SPAEKS membranes exhibit good oxidative and thermal stability, moderate water absorption and swelling rate, as well as excellent proton conductivity. Notably, the proton conductivity of SPAEKS-50 membrane is slightly higher than that of Nafion117 membrane.