Effects of neutralization with Et3Al on structure and properties in sulfonated styrenic pentablock copolymers

► The sulfonated pentablock copolymer solution is neutralized with Et3Al. ► The aluminum neutralized solution persists as spherical micelles. ► Membranes cast from this micellar solution exhibit interconnected SS microdomains. ► The neutralized membrane shows excellent WVTR that is comparable to the acid-form. ► The neutralized membrane provides much improved mechanical stability.