Efeito da temperatura nas propriedades elétricas dos compósitos Na2Ti3O7/Na2Ti6O13/POMA E POMA/Na2Ti3O7/Na2Ti6O13

Abstract

Composite materials based on ceramics and polymers have gained prominence in recent years, as they combine the excellent physicochemical properties of ceramics with the flexibility and additional properties of polymers. Based on this, two sets of composites were prepared from the precursors: the polymer Poly(o-methoxyaniline) (POMA) and the sodium titanate (TS) ceramic. The first set contains 1%, 10%, 15%, 35%, and 50% by weight of the polymer in the TS ceramic matrix. The second set contains 10%, 15%, and 35% by weight of the ceramic in the POMA matrix. To structurally characterize the composites, X-Ray Diffraction (DRX), Raman Spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), Thermogravimetry (TGA), and Differential Scanning Calorimetry (DSC) techniques were used. The technique of Complex Impedance Spectroscopy (EIC) was employed for the electrical characterization of the samples. This work conducts a study on the influence of the mass proportions of TS and POMA on the structure and electrical properties of the composites, both in the TS/POMA ceramic matrix and the POMA/TS polymer matrix. Additionally, the influence of temperature on the electrical properties of these composites is analyzed. The objective is to improve the understanding of the influence of these material proportions on the structure and electrical characteristics of the composites in order to determine their future applications, such as in solid-state battery electrolytes. In general, a decrease in the electrical resistance of the samples was observed with the increase in POMA content. On the other hand, there was an increase in the electrical resistance of the samples with the increase in temperature. The electrical characteristics were analyzed in the formalisms of dielectric permittivity, AC conductivity, and loss tangent, using the models of Cole-Cole, Roy et al., and Arya and Sharma.