Enhancing side chain swing ability by novel all-carbon twisted backbone for high performance anion exchange membrane at relatively low IEC level

•Statement of Novelty: a novel twisted main chain is designed in this work.•The unique non-coplanar structure is introduced to reduce the hindering effect during side-chain swing, facilitating the formation of ion channels and the transportation of OH−.•Besides, combining the superacid catalysis with Suzuki coupling reaction, an all-carbon backbone without any sensitive sites that can be attacked by hydroxide is obtained.•All of this boost the breaking through of the trade-off between swelling resistance, chemical stability and conductivity.•As a result, the high conductivity and stability AEMs are obtained at a relatively low IEC level.