Abstract A novel sulfonated diamine, 4, 4′-bis (4-amino-3-trifluoromethylphenoxy) biphenyl 3, 3′-disulfonic acid (F-BAPBDS), was successfully synthesized by nucleophilic aromatic substitution of 4, 4′-dihydroxybiphenyl with 2-chloro-5-nitrobenzotrifluoride, followed by
