Research the effect of crosslinking degree on the overall performance of novel proton exchange membranes

Click chemistry‐based azide‐substituted polysulfone/alkynyl‐substituted sulfonated polyvinyl alcohol/nafion blend membranes for direct methanol fuel cells

“…It is due to the significant phase separation of PSU‐PVA in the Nafion matrix. At the same time, the crosslinking network restricts the movement of sulfonic groups, which is detrimental to the release of hydrogen ions 29 . The dimensional stability of PEM is mainly evaluated through WU and SR. As shown in Table 4, the WU and SR of recast Nafion and Nafion‐PSU‐PVA‐ x membranes at 30 °C and 80 °C were tested.…”

“…At the same time, the crosslinking network restricts the movement of sulfonic groups, which is detrimental to the release of hydrogen ions. 29 The dimensional stability of PEM is mainly evaluated through WU and SR. As shown in Table 4, the WU and SR of recast Nafion and Nafion-PSU-PVA-x membranes at 30 C and 80 C were tested. Low water absorption and swelling ratios can maintain the dimensional stability of PEM during long-term use but lead to poor proton conductivity of PEM, as the conduction of hydrogen ions within the membrane depends more on the water content inside the membrane.…”

Effect of polymerization on free water in polyacrylamide hydrogels observed with Brillouin spectroscopy

“…It is widely accepted in the field of proton conduction that in most polymeric systems an increase in crosslinks can increase the efficiency of proton conducting membranes. 22,23 This mostly depends on the increased ability to absorb water (swell) with highly crosslinked systems, as water is an effective medium for proton conduction. However, there is still some debate about the trade-offs between mechanical robustness and ion conductivity.…”