Synthesis and properties of sulfonated copoly(p-phenylene)s containing aliphatic alkyl pendant for fuel cell applications

Sulfonated block-graft copolyimide for high proton conductive and low gas permeable polymer electrolyte membrane

“…6. Relationship between proton conductivity (at 80e90 C and 90e98%RH) and oxygen permeability (at 25e40 C and 76 cmHg) of (C) the novel sulfonated polyimide membranes and other previously reported polymer electrolyte membranes: (A) Nafion, (,) sulfonated polyimides [13,17,18,22], (6) sulfonated poly(arylene ether)s [25e28], and (7) sulfonated polyphenylenes [29]. Table 3 Hydrolysis and oxidative stabilities of sulfonated copolyimide membranes.…”

“…The conventional polymer electrolyte membranes including Nafion, sulfonated Table 1 Ion exchange capacity (IEC), proton conductivity (s), and activation energy for proton conductivity (DEa p ) of the sulfonated copolyimide membranes. polyimides [14,15,17e21], sulfonated poly(arylene ether)s [25e28], and sulfonated polyphenylenes [29] have comparable characteristics on their proton conductivity and oxygen permeability, however, the novel sulfonated polyimides, especially S-bg-PI and Srg-PI, showed distinguishing properties that are their low gas permeabilities even though their high proton conductivities. As being apparent from Fig.…”

A facile method for preparation of cardo poly(aryl ether sulfone) bearing pendent sulfoalkyl groups as proton exchange membranes

“…Meanwhile, the weight loss in this temperature range increased with the rise of IEC. The second weight loss step began at about 370 C, associated with the degradation of polymer main chains [20] . The temperature of the 5% weight loss was above 301 C, which was sufficiently high for fuel cell applications.…”

Preparation and Characterization of Phosphoric Acid-doped Blend Membrane Composed of Sulfonated Poly(arylene ether sulfone) and Polybenzimidazole for Fuel Cell Application

“…On the other hand, aromatic hydrocarbon polymer electrolyte membranes have also been actively developed as alternatives for the conventional PFSA membranes. These aromatic hydrocarbon polymers including sulfonated polyimide (SPIs) [5][6][7], sulfonated poly(arylene ether sulfone)s (SPAESs) [8,9], and sulfonated polyphenylenes (SPPs) [10] have advantages in their low environmental load and low production cost as well as their high thermal and mechanical stabilities. However, these membranes often lead the drastical proton conductivity drop under low humidity or dry conditions due to desorption of water from the membranes.previous study, we revealed that the PA-SPI/PBI membrane provided a new proton transport pathway between phosphoric acid and sulfonic acid groups in addition to the conventional proton hopping among phosphoric acid groups at low humidity [11,12].…”