“…Various aniline (ANI)-based copolymers have been reported in the literature. For example, ANI has been copolymerized with orthanilic acid, 1 o-phenylenediamine, 2 2-aminoterephthalic acid, 3 tetrafluoroaniline, 4 3-aminophenol, 5 fluorene, 6 xylidine, 7 N-vinyl carbazole, 8 caprolactone, 9 2-aminobenzoic acid, 10 pyrrole, 11 dithipen-2-ylaniline, 12 o-tluidine, 13 p-phenylenediamine, 14 and thymol blue (TB). 15 In a thorough literature survey, we did not found any report on copolymers containing azo dyes, particularly, Congo red (CR).…”