Effect of oxidant concentration on the co-polymerization of m-aminobenzene sulfonic acid and aniline co-polymer: synthesis and characterization

Abstract

The effect of the concentrations of the oxidizing agent (sodium persulphate) on the properties of poly (m-aminobenzene sulfonic acid -co- aniline) p(m-ABSA-co-Ani) co-polymer has been investigated. The prepared samples were confirmed by Fourier transformation infrared spectroscopy and further, characterized by electron paramagnetic resonance (EPR), UV-Vis spectroscopic techniques and tested for temperature dependent stability by thermogravimetric analyses. The room-temperature conductivity measurements have been performed on all the p(m-ABSA-co Ani) co-polymers samples and found a maximum value of conductivity of ~ 6.5 × 10^-2 S/cm at 168 mM concentration of oxidizing agent. The EPR studies have been shown that the variation of line width of EPR signals withoxidizing agent concentration and found a close relation with electrical conductivity. The prepared co-polymer samples are thermally stable up to 600 ^oC detected by TGA analysis. The synthesized co-polymer materials show around 75% solubility in chloroform, ~65 % in Dimethyl sulfoxide, ~­58 % in N-methyl-2-pyrrolidinone and weakly soluble in aqueous medium.