Highly chlorine-resistant end-group crosslinked sulfonated-fluorinated poly(arylene ether) for reverse osmosis membrane

► End group crosslinked membrane (C-ESFx-BP) showed the use for a chlorine-resistant RO membrane. ► C-ESFx-BP displayed excellent NaCl rejection compared with that of N-ESFx-BP. ► C-ESFx-BP membrane was obtained by covalent crosslinking among ethynyl end groups. ► Both C-ESFx-BP and N-ESFx-BP membranes show the increase in NaCl rejection with decreasing DS. ► C-ESFx-BP and N-ESFx-BP membranes displayed the long-term stability for 30 days.