Obtenção de tecido revestido com polipirrol e nanotubos de carbono para obtenção de tecido condutor

Abstract

Believed that the Smart textiles witness a surprising growth in the coming years. The result of this renewed interest is due to the expansion of commercial products and the development of new techniques to incorporate functionalities in textiles, such as conductivity. The production of a conductive surface can be achieved through the use of intrinsically conductive polymeric materials such as polypyrrole, polyaniline, PDOT, among others. These exhibit high electrical conductivity and moderate stability and are suitable for multifunctional applications; there is also the possibility of using carbon nanomaterials such as graphene, whose the use has been very exploited in recent years due to the excellent conductive properties and mechanical strength. In this sense, this research project aims at obtaining a conductive fabric coated with polypyrrole and incorporating carbonic materials. For this, the oxidative polymerization of pyrrole with the oxidizing agent iron chloride (III) was carried, out in the presence of cotton fabric. Weight ratios of pyrrole and FeCl3 were evaluated. The influence of carbon nanotube incorporation was also tested, which was introduced during the synthesis. The materials were characterized by Thermogravimetric Analysis (TGA), Infrared Region Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDS), X Ray Diffraction (XRD), and by contact angle measurements and mechanical tensile tests. And yet the compaction of the coating was also tested using foulard equipment. The characterizations demonstrated the obtaining of polypyrrole on the fabric, which was distributed homogeneously. It was further verified that the presence of the coating leaves the surface hydrophilic and decreases its tensile strength. The evaluation of the electric resistance of the sheet, which was performed using the four-point method, showed that the lowest value was 175 Ω/□ for the sample with the optimum molar ratio of 2.25 (pyrrole / FeCl3). The decrease or increase of this ratio caused the sheet resistance to increase. It was further verified that the compression of the coating decreased the sheet resistance by about 44% when 1 bar of pressure and 10 passes were applied by the foulard. The application of pressure compacts the coating and contributes to a more homogeneous distribution of the material, which has created more paths of electric current. Applying higher pressures or more passes remove the recoating by grip on the pressurizing roller. The incorporation of carbon nanotubes was not effective in reducing the resistance, considering the incorporation format tested. In general, sheets with low sheet strength, comparable to ITO for example, were obtained and could be useful for applications in the electronic, computational, and textile.