Resumo

RODRIGUEZ C, Jennifer et al. SYNTHESIS OF POLYANILINE/CLAY MICROCOMPOSITE MATERIALS: CHARACTERIZATION AND ASSESSMENT OF ITS ACTIVITY AS ANTICORROSIVE AGENTS. Rev.Colomb.Quim. [online]. 2008, vol.37, n.3, pp.337-353. ISSN 0120-2804.

In the present work microcomposites-materials from polyaniline as emeraldine- base and two Colombian montmorillonites were synthesized. The natural clays were subjected to cationic exchange with an ammonium quaternary salt in order to obtain organophilic clays to be modified with polyaniline by an “in situ” oxidative polymerization. Characterization by infrared spectroscopy (FT-IR), X-ray diffraction analysis (XRD), SEM and DSC reveals the successful synthesis of materials by means of intercalation or delamination of the clay minerals. The synthesized solids were assessed as anticorrosive agents by electrochemical measurements of corrosion potential, polarization resistance and corrosion current on electrodes of cold-rolled 1020 (AISI-SAE) steel. It was found that the synthesized microcomposites provide protection to the surface of steel against corrosive agents, obtaining in this way important difference between the microcomposites materials of polyaniline/ clay, without they can surpass the anticorrosive potential of the polyaniline in the pure emeraldine-base form.

Palavras-chave : nanocomposites; organophilic clays; delaminated clays; polyaniline; polyaniline/clay; corrosion.

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