Preparation of sulfonated poly(ether ether ketone)s containing amino groups/epoxy resin composite membranes and their in situ crosslinking for application in fuel cells

Novel postsulfonated poly(ether ether ketone)-block-poly(ether sulfone)s as proton exchange membranes for fuel cells: Design, preparation and properties

“…In DMFCs, low methanol diffusion coefficient is required because the diffusion of methanol from the anode to the cathode leads to power loss and other undesirable consequences. The methanol permeability values of the obtained membranes were in the range of 0.63-9.60 × 10 −7 cm 2 s −1 ( Table 2), which were much lower than the value of Nafion 117 (2.94 × 10 −6 cm 2 s −1 ) [27].…”

Building bridges: Crosslinking of sulfonated aromatic polymers—A review

“…Kerres et al did many experiments about XL SAP [39][40][41][42][43][44][45][46][47], and Kerres also reviewed the research progress of this topic in [48]. Since then, many new articles have been published and investigations on crosslinking reaction mechanisms and degradation tests (ex situ or in situ) of XL SAP have also been reported [49][50][51][52][53][54]. Recently, Lee et al reviewed the advances of sulfonated hydrocarbon membranes for medium-temperature and low-humidity proton exchange membrane fuel cells (PEMFCs), including polymer sulfonation and physico-chemical properties.…”

Photocrosslinking of Sulfonated Poly(arylene ether ketone)s in a Hydrated State to Obtain Proton Exchange Membranes with High Performance

“…Several approaches were reported to crosslinking of SPAEs through heating, acid–base interaction, and irradiation technology. The heating processes are generally implemented via thermal initiated the chemical reactions of alkynyl, alkenyl, carboxyl, amino, and hydroxyl groups in SPAEs structures. Those reactions at high temperature (120–250 °C) are not recommended, because it would cause narrowing the size of hydrophilic channels and an obviously reduction of proton conductivity .…”

“…The heating processes are generally implemented via thermal initiated the chemical reactions of alkynyl, alkenyl, carboxyl, amino, and hydroxyl groups in SPAEs structures. Those reactions at high temperature (120–250 °C) are not recommended, because it would cause narrowing the size of hydrophilic channels and an obviously reduction of proton conductivity . Using the acid–base interaction between sulfonic acid groups and benzimidazole or cyano groups could effectively improve mechanical properties, chemical and dimensional stability of membranes, but also give rise to a noticeable decrease of proton conductivity for consuming some sulfonic acid groups .…”