Poly(acrylic acid-co-4-vinylimidazole)/Sulfonated poly(ether ether ketone) blend membranes: A role of polymer chain with proton acceptor and donor for enhancing proton transfer in anhydrous system

Template polymerization synthesis of hydrogel and silica composite for sorption of some rare earth elements

“…The absorption peak at 1042 cm À1 indicates the presence of CAH monosubstituted SP 2 bending [11]. The absorption peak at 2810 cm À1 indicates the presence of CAH monosubstituted SP 3 stretching [12]. The absorption peaks appeared at 1550, 3334 and 1654 cm À1 are attributed to contributions of carbonyl (AC@O), amide NH stretching and amide NH bending groups of AMPS and PVP, respectively [10].…”

Imidazole/(HPO3)3‐doped sulfonated poly (ether ether ketone) composite membrane for fuel cells

“…The last distinct loss starts at ∼210°C, with a continuous endothermic peak around 210–230°C, which is attributed to the decomposition of the sulfonic acid groups of SPEEK. From Figure (c), one can see that the glass transition temperature for pure SPEEK membrane is around 205°C …”

“…Kreuer K.D. reported that protons might transfer through hydrogen‐bonded ionic channels such as imidazole under Imi…ImiH + …Imi route . For SPEEK/imidazole/(HPO 3 ) 3 composite membranes, imidazole/(HPO 3 ) 3 as proton reservoirs constructs numerous new proton‐transfer pathways within the membranes and thus increases the membrane's proton conductivity.…”

“…Recently, SPEEK shows great potential for PEMs, owing to its good mechanical properties, high chemical resistance, thermal stability and low price in contrast to Nafion® . However, the SPEEK with a low degree of sulfonation (DS) generates inferior conductivity, which is detrimental to its practical use in the PEMFC system at intermediate temperatures.…”

A Review on Sulfonated Polymer Composite/Organic-Inorganic Hybrid Membranes to Address Methanol Barrier Issue for Methanol Fuel Cells

“…The analysis suggests that the SPEEK membranes with the addition of sulfonated cyclodextrin in DMFCs can be used as potential usage applications. Jithunsa et al [99] developed a sulfonated poly ether ether ketone (SPEEK) membranes containing poly(AA-co-4VIm) at a low humidity operation in the polymer electrolyte fuel cells. The sulfonated membranes showed an improvement in thermal stability compared with SPEEK membrane.…”