Synthesis and properties of processable conducting copolymers from N‐ethylaniline with aniline

Copolymers were synthesized through the chemically oxidative polymerization of N-ethylaniline (EA) and aniline (AN) in five acid aqueous media. The polymerization yield, intrinsic viscosity, molecular weight, solubility, solvatochromism, electrical conductivity, and mechanical properties of the copolymer films were systematically studied through changes in the comonomer ratio, polymerization temperature, oxidant, oxidant/monomer ratio, and acid medium. Open-circuit-potential and temperature measurements of the polymerization solutions showed that the polymerization rate depended on the EA content, and the polymerization was an exothermic reaction. The resultant copolymers were characterized in detail with IR, ultraviolet-visible, and 1 H NMR spectroscopy, gel permeation chromatography, wide-angle X-ray diffractometry, and scanning electron microscopy. The reactivity ratios of the monomer pair were calculated from the 1 H NMR spectra of the copolymers formed at a low conversion. The polymers exhibited good solubility and interesting solvatochromism in most of the solvents and variable conductivity with the EA/AN ratio and doping state. The conductivity of the HCl-doped copolymers increased monotonically from 5.61 × 10 -7 to 2.55 x 10 1 S/cm with decreasing EA content from 100 to 0 mol % and showed a percolation transition between EA concentrations of 20 and 30 mol %. The EA/AN copolymers also had excellent film formability and flexibility together with high mechanical and oxygen-enriching properties.

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