Sulfonated PEEK and fluorinated polymer based blends for fuel cell applications: Investigation of the effect of type and molecular weight of the fluorinated polymers on the membrane’s properties

Investigation and optimization of physicochemical properties of sulfated zirconia/sulfonated poly (ether ether ketone) nanocomposite membranes for medium temperature proton exchange membrane fuel cells

“…A membrane sample was vacuum dried, weighed and soaked in Fenton reagent (3%wt. H 2 O 2 aqueous solution containing 4 ppm Fe 2þ ) at 68 C [54]. The passed time between immersion and complete degradation of the sample was recorded as a measure of anti-oxidative stability and assigned as t degradation (min).…”

Mn2(CO)10-photomediated synthesis of poly(vinylidene fluoride)-b-poly(styrene sulfonate)

“…Typically, sulfonate groups can be introduced using e.g. sulfonated poly(ether ether ketone) [5] or styrene sulfonic acid units [59,60], including radiation-induced grafting of styrene with subsequent sulfonation [61][62][63]. However, while sulfonation of styrene [60,64] is a well-known approach, the degree of sulfonation is not quantitative, and (co)polymerization of styrene sulfonic acid (SSA) or its salts or esters, followed by deprotection is therefore often preferred.…”

Effect of degree of sulfonation and casting solvent on sulfonated poly(ether ether ketone) membrane for vanadium redox flow battery

“…2a. The four absorption peaks of eSO 3 H group in SPEEK [40,41], including asymmetric and symmetric stretching of O]S]O (1251 and 1076 cm e1 ), S]O stretching (1016 cm e1 ), and SeO stretching (708 cm e1 ), were clearly demonstrated. The peak intensity also correspondingly increased with the DS increment, reflecting the consistency between membrane and characterization.…”