Enhancing properties of poly(2,6-dimethyl-1,4-phenylene oxide)-based anion exchange membranes with 5-mercaptotetrazole modified graphene oxides

摘要: Abstract Anion exchange membranes (AEMs) with high conductivity and superior stability against the attack from strong alkali working medium are highly needed. The graphene oxide (GO) having lamellar structure of about 1.5 nm in thickness was first modified 1-(2-(dimethylamino)ethyl)-1H-tetrazole-5-thiol followed by quaternization 2-(dimethylamino)ethyl group (5-bromopentyl) trimethylammonium bromide. quaternized (QGO) doped into poly(2,6-dimethyl-1,4-phenylene oxide) (QPPO) to fabricate AEMs comprehensive properties. introduced QGO obviously changed microphase more ion clusters for conduction according images taken atomic force microscope. prepared membrane doping 0.25 wt% reached a hydroxide 75 mS cm−1 at 80 °C. Moreover, hybrid exhibited improved alkaline stability, enhanced Young’s modulus than 600 MPa, low methanol permeability 10−7 cm2 s−1 order magnitude compared pristine QPPO membrane. Working as radical scavenger, endowed retaining rate 84% after immersed 2 M KOH solution 60 °C 360 h, while retained its original 56%.