Preparation and properties of highly branched sulfonated poly(ether ether ketone)s doped with antioxidant 1010 as proton exchange membranes

- The highly branched sulfonated poly(ether ether ketone)s were synthesized.
- The highly branched sulfonated polymer/antioxidant composites were prepared.
- The membranes exhibited excellent oxidative stability and proton conductivity.