Comparison of proton conducting polymer electrolyte membranes prepared from multi-block and random copolymers based on poly(arylene ether ketone)

Synthesis and investigation of sulfonated poly(p-phenylene)-based ionomers with precisely controlled ion exchange capacity for use as polymer electrolyte membranes

“…Generally, a high IEC leads to low oxidative stability because oxidative attack by a radical species, which is classied as an electrophilic addition, mainly occurs in hydrophilic domains and results in membrane degradation. 28,29 As expected, the oxidative stability of membranes increased with decreasing IEC values. Aer immersion in the Fenton's reagent for 2 h, the membranes of S-PPBP and S-PPBP-co-PPBP 9 : 1 were completely dissolved in the Fenton's reagent.…”

Synthesis and Properties of Fluorocarbon–Hydrocarbon Hybrid Block Copolymers with Perfluorosulfonimide Acid

“…2−24 For hydrocarbon electrolytes to exhibit high proton conductivity, it has been reported that a block copolymer that consists of a regular arrangement of hydrophobic and hydrophilic segments maintains significantly higher proton conductivity under low humidified conditions than that which consists of a random arrangement of the segments. [2][3][4]9,10,18 However, hydrocarbon-hydrophilic segments with sulfonic acids exhibit weaker acidity than perfluorosulfonic acids, and there have been a few reports on embedded perfluorosulfonic acids or perfluorosulfonimide acids as side chains of hydrophilic segments. 25−28 Poly-(perfluoroalkyl sulfonimides) (PCSIs) are promising candidates as the hydrophilic segment of block copolymers.…”

“…Many studies have been conducted on aromatic hydrocarbon polymer electrolytes as alternative membranes, which consist of hydrophilic hydrocarbon segments and hydrophobic hydrocarbon segments. − For hydrocarbon electrolytes to exhibit high proton conductivity, it has been reported that a block copolymer that consists of a regular arrangement of hydrophobic and hydrophilic segments maintains significantly higher proton conductivity under low humidified conditions than that which consists of a random arrangement of the segments. − ,,, However, hydrocarbon-hydrophilic segments with sulfonic acids exhibit weaker acidity than perfluorosulfonic acids, and there have been a few reports on embedded perfluorosulfonic acids or perfluorosulfonimide acids as side chains of hydrophilic segments. − Poly­(perfluoroalkyl sulfonimides) (PCSIs) are promising candidates as the hydrophilic segment of block copolymers. Hu and DesMarteau reported the synthesis and properties of PCSIs, and the advantage of PCSIs in the control of equivalent weight (EW) by changing the alkyl chain length, and synthesized a polymer with a number of sulfonimide repetitions as intended. − There has been no report of the incorporation of segments with highly repetitive sulfonimide into main chains of hydrophilic segments.…”

Chemical stability enhancement of crown ether grafted sulfonated poly(arylene ether ketone) fuel cell membrane by cerium ion fixation

“…In order to replace Nafion, researchers have studied a number of hydrocarbon‐based polymers, including poly(arylene ether ketone) (PAEK), polyimide, poly(vinyl alcohol), and poly(arylene ether sulfone) . Among them, PAEK is one of the potentially considered membranes because of its cheap price, easy sulfonation process, and excellent thermal and mechanical resistance …”

“…[4][5][6][7][8][9][10][11][12][13][14] Among them, PAEK is one of the potentially considered membranes because of its cheap price, easy sulfonation process, and excellent thermal and mechanical resistance. [13][14][15][16] The chemical stability of electrolyte membrane is recently a critical issue in its development as the deterioration of long-term cell performance is directly related with its chemical degradation. In PEMFC or DMFC operation, ÁOH radicals are known to be the main cause for degradation of polymer membrane.…”