Doping polyaniline with copper bisglycinate[Cu(gly)2]—Synthesis, characterization and thermal study

Abstract

The present paper deals with the synthesis of polyaniline (PANI) composite with dopant copper bisglycinate (Cu(gly)2) via in situ oxidative polymerization by ammonium persulphate. The dopant has been synthesized by the known method and characterized by using elemental analysis, FTIR, XRD and thermogravimetric (TG) analysis. The composite based on the synthesized dopant has been subjected to FTIR, X-ray diffraction and SEM characterization techniques. Thermal analysis has been done by using TG and DSC technique. Viscosity average molar mass of the composite has been determined by viscosity method using Ostawald's viscometer and Mark–Houwink Sakaruda polymer equation. FTIR absorption peaks confirm the insertion of dopant in the backbone of PANI. The FTIR spectrum of composite shows that it is rich in both quinoid and benzenoid rings, hence showing partitial oxidation of PANI base. SEM of the composite also supports its successful synthesis. The XRD of dopant shows crystalline structure, which has remained dominant in the composite, hence proving the successful synthesis of PANI composite with dopant. Various parameters like crystallite size (L), interplanar distance (d), micro strain (ε) and dislocation density (ρ) have been calculated by using Bragg's and other related equations. Moreover lattice parameters a, b, c, α, β and γ have also been calculated for the dopant as well as the composite using powder X software. The calculated d spacing values are in agreement with the experimental d spacing values. Thermal analysis shows high thermal stability of dopant which in turn has improved the thermal stability of PANI composite, therefore, shows the potential of composite for high temperature application purposes.