Manipulation of polymer layer characteristics by electrochemical polymerisation from mixtures of aniline and ortho-phenylenediamine monomers (CROSBI ID 148917)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Kraljić Roković, Marijana ; Jurišić, Aleksandra ; Žic, Mark ; Duić, Ljerka ; Schauperl, Zdravko
engleski
Manipulation of polymer layer characteristics by electrochemical polymerisation from mixtures of aniline and ortho-phenylenediamine monomers
The influence of adding ortho-phenylenediamine (OPDA) during the polymerisation of aniline on the characteristics of the resulting polymer film has been examined. When using a platinum electrode, the deposits were obtained from solutions containing 0.1 mol dm-3 aniline and 1, 5 or 10 mmol dm-3 of OPDA. The deposits were also prepared from solutions containing 0.5 mol dm-3 aniline and 5, 10 or 50 mmol dm-3 of OPDA. In both cases, 3 mol dm-3 phosphoric acid solution was used as a supporting electrolyte. The characteristics of the obtained layers were investigated through the catalytic effect of different polymer layers on hydroquinone/quinone (H2Q/Q) test redox system. The results obtained confirm the earlier established catalytic effect on the potential of the redox reaction by shifting it to more reversible values. However, as the concentration of OPDA was increased the resulting limiting current decreased, thus indicating in the presence of OPDA, a lower population of the available active centres necessary for the catalytic reaction to proceed. The influence of OPDA on polymer characteristics was also studied using scanning electron microscopy (SEM) as well as electrochemical impedance spectroscopy (EIS). The polymer was synthesised on a stainless steel (SS) electrode (13% Cr) from a solution containing 0.5 mol dm-3 aniline and 5, 10 or 50 mmol dm-3 of OPDA. The layers were tested in chloride-containing solutions by monitoring the open circuit potential (OCP). The results obtained suggest that, by increasing the concentration of OPDA, the time of OCP in the passive region of SS is prolonged.
modified polyaniline ; conductive polymer ; ortho-phenylenediamine ; catalysis ; corrosion protection ; morphology
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Podaci o izdanju
113 (1)
2009.
427-436
objavljeno
0021-8995
1097-4628
10.1002/app.29974
Povezanost rada
Kemija, Kemijsko inženjerstvo