Análise da condutividade e estabilidade térmica de compósitos de polianilina e botriosferana com foco em desenvolvimento de biomateriais

Abstract

With the development of the technology the tissue engineering area has become promising for the development of new biomaterials, mainly in the field of modified fabrics, living tissue for therapeutic applications. The need of the combination of biological and synthetic components, with a combination of properties of interest of both constituent phases, gives rise to a new composite biomaterial, obtaining the best performance in its functions. Thus, polyanilines were synthesized by different synthesis methods in the morphologies of nanospheres, nanofibers (rapid mixing and interfacial polymerization) and nanotubes. The PANI and Botriosferana samples were chemically characterized by FTIR and ATR spectroscopy, respectively, in addition to the thermogravimetric analysis of both. The films were processed with 15% loading of PANI by ultrasonic mixing followed by drying at 60 ° C for two hours. The TGA analysis was performed in each of the films and it was possible to observe three stages of mass loss, except for the nanotube loading film (PB NT), composed only of two, the first of loss of water molecules and (NF-MR). The results show that the high thermal stability of the composite with nanofibres was obtained by rapid mixing (PB NF MR). After measuring the sheet resistance through a four-point method, it was possible to obtain the conductivity of the films, which remained in the order of 101, especially the films with nanotubes and nanofibers via MR that obtained the highest values of conductivity. The morphologies of the film of Botriosferana and of the composites were observed by the SEM and showed peculiar characteristics of the agglomerates formed in the PB that had a direct influence of the forms of the nanoparticles and the reagents used for the polymerization of the PANI, besides interfering in the dispersion of the loads in which the More uniform was obtained by PANI NF MR. The obtained results show that the composite PB NF MR has better performance in relation to all parameters evaluated.