Towards carboxylic acid-functionalized aniline monomers: Chemical synthesis, electropolymerization and characterization

•Carboxylic acid-functionalized anilines were synthesized.•Substituted polyaniline films were prepared by anodic electropolymerization.•Full characterization of substituted polyaniline films properties.•Influence of the grafted alkyl chain length on polymer films properties.•Influence of the nature of the electrolyte (hydrochloric acid or phosphoric acid).