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A study of different oxidation states of poly(5-amino-1-naphthol), poly(5-NH21-NAP), in aqueous acid solutions of chloridric and camphorsulfonic acid is presented. Resonant Raman spectroscopy was used as a tool for following structural changes provoked by not only the redox potential but also the anion used in the polymerization or cycling processes. The apparent chemical homogeneity of the films is questioned because the coexistence of different segments, in the polymeric chain, was observed. Raman spectroscopy together with XPS caracterization allows inferring the presence of “polyaniline-like” segments formed from para coupling during polymerization and also “phenazine-like” segments from ortho coupling leading to a ladder structure.

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Polypyrrole was synthesized onto aluminum surfaces by electrochemical polymerization technique using pyrrole monomer and phosphoric acid in aqueous medium. The influence of applied potential on the morphology of the films was studied by Scanning electron microscopy (SEM). The films displayed a cauliflower-like structure consisting of micro-spherical grains. This structure is related to dopant intercalation in the polymeric chain. The efficiency of these polymeric films to protecting aluminum alloy against corrosion was investigated by potentiodynamic polarization curves. It was also observed that the polymer roughness depend on the applied potential.

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