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Electrochemical copolymerisation of aniline and ortho-phenylenediamine

It is known that the addition of ortho-phenylenediamine (OPDA) to aniline solutions for the electrochemical polymerisation, results in layers with the change in morphology compared to the morphology of pure polyaniline (PANI) layers. That change is accompanied by other changed properties of the layer lika catalyses and corrosion protection. In the test of catalytic activity it is shown that the catalytic current of H2Q/Q reaction decreases with the increase of OPDA in the solution of synthesis, but as long as aniline is part of the layer there is a catalytic decrease of H2Q/Q reaction potential difference (Ep). In case of pure POPDA layer there is no catalytic activity whatsoever. The images taken from optic microscope indicate that at higher content of OPDA there is an independent growth of different polymers, presumably, PANI and PODPA., indicating that the actual copolymerisation is not taking place in a sense of incorporating different monomers into the same polymer. The images taken by AFM confirm quite different morphology of the regions of different colours.

polyaniline; phenylenediamine; copolymerisation

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