Degradation of a sulfonated aryl ether ketone model compound in oxidative media (sPAEK)

Durability of Sulfonated Aromatic Polymers for Proton‐Exchange‐Membrane Fuel Cells

“…Model degradation mechanism in the presence of hydrogen peroxide. [92] ChemSusChem [71,72] Also, there was some pinhole formation in the membrane after the durability test. [2] In addition, the dependence of the mechanical properties on the membrane temperature and hydration may negatively affect the long-term stability of fuel cells.…”

“…However, the corresponding experimental conditions are not yet uniform, for example, the concentration of H 2 O 2 ranges from 3 to 30 %, the test temperature is from 25 to 80 8C, and the concentration of ferrous salt is from 2 to 30 ppm. [92] SAPs degraded according to two possible mechanisms when oxidized by radicals: the detachment of the sulfonic acid groups and the scission of the polymer chain. The former results in a decrease in the performance, whereas the latter results in stability and lifetime issues for the PEMFCs.…”

“…Based on these modern techniques, Perrot et al presumed the plausible degradation process of sulfonated arylether-ketone model compounds (Scheme 5). [92] Moreover, two strategies to improve the stability were also proposed: 1) the ether linkage could be replaced with an electron-withdrawing group, such as ÀSO 2 À; and 2) addition reactions in the meta position could be avoided by attaching a pendant group to the aromatic ring.…”

Effect of sulfonation degree on performance of proton exchange membranes for direct methanol fuel cells

“…Among different alternative PEMs, sulfonated polyaryl ether ketones(SPAEKs) possess merits such as low cost, excellent thermal stability, low sensitivity to oxidation and to hydrolysis of their unsulfonated homologous, acceptable proton conductivity, and proper methanol permeability [6,[9][10][11] . In the SPAEKs based membranes, the sulfonic acid groups show relatively low acidity and the polymer structure is not flexible, therefore, phase separation between hydrophilic and hydrophobic domains is less distinct than that in Nafion ® 117.…”

Synthesis and characterization of copolysulfonate of 1,1′-bis(3-methyl-4-hydroxyphenyl)cyclohexane, bisphenol-A, and 4,4′-diphenyl disulfonyl chloride

“…are promising high performance engineering thermoplastics owing to their excellent chemical, thermal, mechanical, thermooxidative, and hydrolytic stability [1][2][3][4][5][6][7][8]. They find their industrial applications in fuel cells, membrane, and other industries.…”