MATERIAIS HÍBRIDOS FORMADOS ENTRE POLÍMEROS CONDUTORES E MAGNETITA

Abstract

In this work, we present the chemical synthesis of polypyrrole and polyaniline precursor materials and its hybrid material formed with magnetite polypyrrole/magnetite and polyaniline/magnetite, respectively. The synthesis of hybrids materials was performed using three different proportions of magnetite. All the materials obtained in this work were characterized by ultraviolet-visible spectroscopy (UV-VIS), X-ray diffractometry (XRD), Scanning Electron Microscopy (SEM), Energy dispersive X-ray fluorescence (EDXRF), Simultaneous thermogravimetric analysis TG/DTA and Cyclic Voltammetry. Precursors and hybrids were studied in a comparative way to evaluate the influence of the magnetite on the hybrid properties and estimate the best proportion of magnetite to be added in each polymer matrix. From the obtained results, it was possible to analyze the influence of the proportions of magnetite under the polymeric material in the formation of the hybrid. Regarding the pure material, the hybrids presented better properties in most of the techniques like EDXRF, X-rays, SEM. These results revealed that there was a limited amount of inorganic material for each polymer matrix, which depends on several factors, such as the magnetite particle size (in this study it was on micrometric scale) and that higher or lower amounts of inorganic phase do not present satisfactory results in relation to the potential application of these hybrid materials in electrochemical systems. The cyclic voltammetry showed a small improvement in the electrochemical behavior of the hybrid materials in relation to the precursors, showing a potential application mainly in capacitors and electrochemical sensors.