ABSTRACT

498Silica-glauconite/polyaniline (Si-Gl/PAn) composites were synthesized by in situ polymerization in the presence of 0.5 m H2SO4 as dopant by adding of Si-Gl microparticles into aniline (An) aqueous solution. The composites were characterized by X-ray diffraction (XRD) analysis; Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, thermogravimetry (TG), differential thermogravimetry (DTG), and differential scanning calorimetry (DSC). Using the XRD analysis and FTIR spectroscopy, it was shown that the structure of Si-Gl/PAn composite is amorphous–crystalline. In addition, an analysis of the physical–chemical properties confirms that the synthesized samples of Si-Gl/PAn represent by themselves the composite, but not a mechanical mixture of the components. At the same time, the PAn in composite is characterized by higher degree of crystallinity compared with a pure PAn. Using the FTIR and Raman spectroscopy it was showed that between the macromolecules of PAn and the surface of Si-Gl particles available interphase interaction through the formation of hydrogen bond. It was established that the thermal destruction of pure PAn and Si-Gl/PAn into inert atmosphere (argon) is a multistage process; it was described some stages of this process. Using the FTIR spectroscopy and the mass spectrometry (MS) methods, the nature of the gaseous products of the thermolysis of individual components (Si-Gl and PAn) and Si-Gl/PAn composite in the temperature range 20–1000°C have been determined. It was found, that the introduction of natural mineral (NM) Si-Gl into the PAn insignificantly accelerates the thermal destruction of PAn. Based on the results of TG–analysis it was evaluated the composition of the obtained composite: at the mass ratio of Si-Gl:An in the reaction mixture, which was ~1:1, the mass ratio of Si-Gl:PAn in the obtained composite was about 1:2.