Crosslinked poly (2,6-dimethyl-1,4-phenylene oxide) polyelectrolyte enhanced with poly (styrene-b-(ethylene-co-butylene)-b-styrene) for anion exchange membrane applications

Hybrid anion exchange membranes with adjustable ion transport channels designed by compounding SEBS and homo‐polystyrene

“…Figure 4(b) displays ionic conductivity as a function of temperature for all the AEMs. For each sample, higher ionic conductivity is observed at higher temperature, which is commonly attributed to the mobility increase of the polymer chains 44–47 . At all the temperatures, ionic conductivity increases with the increase of total PS content, consistent with the trends of WU, SR, and IEC (Figure 4(a)).…”

“…As a result, the SEBS AEMs show low dimensional stability in water because the ammonium‐functionalized PS phase has high water uptake weakening the mechanical strength 39–43 . This can be typically addressed by cross‐linking the functionalized PS phase, which improves the mechanical properties at the cost of conductivity and solubility 44–46 . For example, Jeon and coworkers cross‐linked the PS units with 1,6‐hexanediamine, which, significantly reduced water uptake (e.g., 155% vs 28%) and enhanced their mechanical properties 47 .…”

Crosslinked Pore-Filling Anion Exchange Membrane Using the Cylindrical Centrifugal Force for Anion Exchange Membrane Fuel Cell System

“…In detail, it decreased by 24% compared to the initial conductivity value. As observed in Figure 8 , PF-XAc-PPO70_25 exhibited about 76% of initial conductivity value after exposed in 1M KOH at 60 °C for 800 h could be due to the steric hindrance offered by the crosslinking structure which can reduce the access of nucleophilic attack to the functional groups by the excess amount of OH− and protect the backbone [ 50 ]. Moreover, the presence of water also has important role in hydroxide ion attack on membranes.…”

Alkaline membrane fuel cells: anion exchange membranes and fuels

“…81 It has been reported that graing multiple cations on the polymer backbone can form hydrophilic/hydrophobic micro-phase separation and decrease the functional degree of the copolymer, which can restrain the degradation of the polymer backbone. 82 Studies of the relationship between the degree of functionalization and the structure of the side chain (in terms of charge number and charge arrangement) have been performed, notably on PPObased AEMs with different kinds of quaternary ammonium side chains (triple, double and single-cation per cation side chain) and have found that multiple cation AEMs exhibited a higher ionic conductivity and lower water uptake due to the phase separation of the hydrophobic domains at low degree of functionalization and larger ionic clusters induced by the presence of the side chains. 83 A study investigated the trade-off dilemma between ion conductivity and water uptake in poly(biphenyl alkylene)-based AEMs tethered with multiple quaternary ammonium groups per side chain.…”