Electrochemical oxidative polymerization of pyrrole on platinum electrode in acid medium was carried out. Different reaction parameters were investigated such as current density, acid concentration, monomer concentration, and temperature with duration of time. The orders of the electropolymerization reaction were found to be 1.3, 1.26, and 1.2 with respect to current density, acid concentration, and monomer concentration, respectively. The apparent activation energy was found to be 38.3 kJ mol Ϫ1 . The obtained polymer films were characterized by 1 H-NMR, elemental analysis, thermogravimetric analysis, and cyclic voltammetry. The mechanism of the electrochemical polymerization reaction was also discussed. The surface morphology of the obtained polymer film was characterized by X-ray diffraction and scanning electron microscopy.

Electropolymerization of p-phenylenediamine (pPD) on Pt-electrode from a deoxygenated aqueous acid medium was carried out using cyclic voltammetry technique. The kinetic parameters were calculated by means of electrochemical data. The experimentally obtained kinetic equation was1.23 [acid] 1.24 [electrolyte] 0.94 from the value of the anodic current density. The apparent activation energy (E a ) is found to be 65.1 kJ mol À1. The obtained polymer films have been characterized by X-ray diffraction, elemental analysis, scanning electron microscopy, UV-vis, and IR spectroscopy. The conductivity of the polymer pellets is 6.3 Â 10 À7 S cmÀ1 . The mechanism of the electrochemical polymerization reaction has been discussed. TGA is used to confirm the proposed structure and determination of the number of water molecules in the polymeric chain unit. V C 2010Wiley Periodicals, Inc. J Appl Polym Sci 117: [943][944][945][946][947][948][949][950][951][952] 2010

Electropolymerization of O-phenylenediamine (o-PD) on Pt-electrode from a deoxygenated aqueous acid medium was carried out using cyclic voltammetry technique. The kinetic parameters were calculated by means of electrochemical data. The experimentally obtained kinetic equation1.19 [acid] 1.23 [electrolyte] 0.87 from the value of the anodic current density using cyclic voltammetry technique. The apparent activation energy (E a ) is found to be 28.34 kJ mol C-NMR, UV-visible, and IR spectroscopy. The mechanism of the electrochemical polymerization reaction has been discussed. TGA is used to confirm the proposed structure and determination of the number of water molecules in the polymeric chain unit.

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Electropolymerization of 3-chloroaniline on a platinum electrode in an acid medium was carried out under different reaction conditions of temperature, current density and hydrochloric acid and monomer concentrations with duration time. The initial rate of the electropolymerization reaction was small, and the orders were 0.99, 0.96 and 1.2 with respect to current density and acid and monomer concentrations, respectively. The apparent activation energy was 41.6 kJ/mol. The rate law was R p ϭ k 2 (Current density) . The obtained polymer films were characterized by 1 H-NMR, elemental analysis, IR spectroscopy, and cyclic voltammetry. The mechanism of the electropolymerization reaction is also discussed. Thermogravimetric analysis was used to confirm the proposed structure and determination of the number of water molecules in the polymeric chain unit. X-ray and scanning electron microscopic analysis are used to investigate the surface morphology.

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Corrosion inhibition of mild steel in hydrochloric acid solutions using electropolymerized Poly 2-aminobenzothiazole, P(2ABT), was evaluated using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy measurements at different temperature. Results showed that the inhibition efficiency increases with increasing the concentration of P(2ABT) up to 12.7 9 10 -6 mol L -1 and decreases with raising the temperature. Polarization curves indicate that the studied compound acts as anodic inhibitor. Thermodynamic activation parameters for both dissolution and adsorption processes are calculated and discussed as well as the adsorption isotherms are calculated. Gibbs free energy value confirms the physical nature of the adsorption, also the mechanism of inhibition is discussed. Scanning electron microscopy is used to study the surface morphology of mild steel in hydrochloric acid solution in the absence and presence of 12.7 9 10 -6 mol L -1 P(2ABT). Data obtained from all techniques are in a good agreement with each other.