Optimization for the Chemical Synthesis of Conducting Poly (m-aminophenol) in HCl using Ammonium Persulfate

Abstract

Poly (m-aminophenol) (PmAP) was synthesized from m-aminophenol (mAP) by ammonium persulfate (APS) as an oxidizing agent in aqueous HCl. Polymerization conditions were optimized by varying HCl concentration, amount of mAP and APS, temperature and time. The synthesized polymers were insoluble in organic solvents even after dedoping. The polymers were characterized by UV-VIS and Fourier transform infrared spectroscopy, thermogravimetric and elemental (CHNS) analyses. Four-probe DC electrical conductivity of the pelletized polymer was measured. The spectral results clearly indicated that the ladder structure was formed during the chemical polymerization of mAP in aqueous HCl. This structure was supported by elemental analysis. Thermal stability of the undoped and in-situ HCl doped polymers was measured. The highest conductivity of the synthesized polymer pellet was 1.0 × 10^-7 S cm^-1. A polymerization mechanism was proposed.

Keywords

poly-m-aminophenol poly-3-aminophenol polyaminophenol conducting polymer polymer of aniline derivatives

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