Electropolymerization of Aminoanthraquinone- Kinetics of the Polymer Film Formation and its Electroanalytical Applications

Abstract

Aminoanthraquinone, AAQ, was electropolymerized in mixed solvent to form poly (aminoanthraquinone), PAAQ, films. In order to optimize the conditions for polymer film formation and its electrochemical response in aqueous media, the factors that influence the stability and the electroactivity of the polymer film were subjected to intensive investigation. The kinetics of the electropolymerization of PAAQ prepared from aqueous, non-aqueous and mixed solvents was carried out by determining the change of charge consumed in the polymerization process with time at different concentrations of both monomer and electrolyte. The results have shown that the process follows first order kinetics with respect to the monomer concentration either in aqueous, non-aqueous or mixed solvent. The order of the reaction with respect to the supporting electrolyte in non-aqueous solutions was found to be zero. The order of the reaction with respect to the aqueous or mixed solvent i.e. H2 S04 was found to be negative. The polymer films were successfully used as sensor for the electroanalytical determination of many hazardous compounds, e.g. phenols, and biologically important materials like dopamine. The electroanalytical determination was based on the measurements of the oxidation current peak of the material in the cyclic voltammetric measurements and calibration curves were constructed