Synthesis of composites glauconite/polyaniline doped phosphatic acid and their properties

Abstract

Polyaniline (PAn) and composites of glauconite/polyaniline (Gl/PAn) were synthesized by chemical oxidation polycondensation of aniline with ammonium peroxodisulfate in aqueous solutions of different concentrations of phosphoric acid, namely 0.60 M or 0.80 M, or 1.65 M, or 3.30 M. The content of glauconite in the reaction mixture was1 g, and the ratio of aniline : glauconite was 1 : 1. The properties of synthesized samples are investigated using by modern physical methods of analysis. The physical analysis of samples properties has been carried out using a Dron-4-07 diffractometer (Cu Kα radiation; l=1.54060 A) in the reflection mode. Fourier-transform infrared (FTIR) spectrа of powders sample were recorded out using a NICOLET IS 10 ATR spectrophotometer in the mode of reflection, which was later transformed into transmission mode. Thermal properties of synthesized samples has been analyzed using Q 1 500-D Derivatograph in the temperature range of 20–900 °C under a heating rate of 10 о /min in the atmosphere of air (corundum crucibles; standard – Al 2 O 3 ; weight of samples – 100 mg). The electrical conductivity of the pelleted samples was determined by measuring their resistance in the sandwich type cells at a temperature of 20±1 о С using a Rigol DM 3 068 set of equipment for resistance measuring. It was found that with increasing by concentration of phosphate acid in the initial reaction mixtures, the crystallinity of polyaniline in samples of pure PAn increases, whereas in samples of composites of Gl/PAn, the polyaniline are preferably amorphous. Intermolecular interaction between the components of the composite is due to the formation of hydrogen bond. Comparison of the results of derivatographic studies showed that the thermal properties of composites depend on the content of glauconite. Thermal stability is higher in samples containing glauconite. It is established that the process of thermodestruction of composites is complex and multistage. Specific electrical conductivity of the received composites of Gl/PAn is less than in PAn samples synthesized at different concentrations of phosphoric acid. Keywords: polyaniline, glauconite, composite materials, structure, thermal analysis, electrical conductivity.