Síntese, dopagem e caracterização da polianilina com sais de Fe (II) e Fe (III)

Abstract

In present work, the synthesis and characterization of polyaniline has been done. The Polyaniline was prepared using aniline and (NH4)2S2O8 in acid medium at 0°C. A polymer solid was obtained yield was equal 60.4% and with molecular weight of 246.13 kg/mol, determined by the technique of viscosity. The synthesized polymer was added salts of Fe (II) and Fe (III), to study the changes in their structural properties, thermals and the conductivity. The samples were studied by techniques of elemental analysis, infrared spectroscopy (FTIR) in the Ultraviolet-Visible (UV-VIS) and Mössbauer, X-ray diffraction, SEM, EDS, Thermal Analysis (TG and DSC), and measures to of solutions of polyaniline conductivity and resistivity under pressure of solid polymer samples. The experimental results using these techniques showed that the ions Fe (II) interact with the benzenoids nitrogen supported by data from Mössbauer and resistivity, and thus can be suggested is that the formation of a complex Pani-Fe (II). Furthermore, the ions Fe (III) added to Polyaniline showed no significant interaction with the polymer chain. Therefore, it was observed that it is possible the interaction of ions Fe (II) and Fe (III) with polyaniline as esmeraldine salt, and kept its conductive properties. ix