Spectroscopic characterization of polyaniline conductive blends and their application for the active protection against corrosion of metals

Author(s)

José Eduardo Pereira da Silva

• Document type: Doctoral Thesis
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ)
• Defense date: 2003-06-04

Examining board members

Susana Ines Cordoba de Torresi; Debora Goncalves; Yoshio Kawano; Luiz Henrique Capparelli Mattoso; Osvaldo Novais de Oliveira Junior

• Advisor: Susana Ines Cordoba de Torresi; Marcia Laudelina Arruda Temperini

Abstract

This work shows the spectroscopic, electrochemistry and spectroelectrochemistry characterization of conducting polyaniline blends. In the first part it was done the characterization of the materials by Raman and infrared vibracional espectroscopies. Using resonance Raman spectroscopy it can be observed that conducting polymer conformation and chemical structure does not changed inside or outside insulating matrices. It was also possible to check that the relative intensities of 574 and 607 cm-1 bands indicate the degree of physical interaction of polymers in the blends, moreover the relationship between intensity of mentioned bands and the conductivity was investigated. In second part it was studied the application of conducting blends for corrosion protection on iron and aluminum alloys A2024. Results obtained showed the good eficiency of these materials, proved by open circuit potential and cyclic voltammetry. It was observed that the protection depends on the formation passive of a film between the coating and the metallic material. On the other hand, the physical barrier of blends are better than pure conducting polymer and decreases the penetration of anions that promote the degradation of metallic materials. (AU)