Abstract
The cost effective synthesis of electroactive polyaniline (PANI) while retaining its desirable properties is one of the most debatable and challenging tasks for researchers in the field. Herein, we report a cost effective inverse emulsion polymerization pathway for the synthesis of soluble and processable PANI salt by using diesel as a novel dispersion medium. Different reaction parameters and their effects on the properties and yield of polyaniline were optimized. The polymer exhibited a highly porous morphology and was found to be stable up to 417 °C. The PANI salt showed good solubility in common solvents, such as chloroform, N-Methyl-2-pyrrolidone (NMP), dimethyl sulphoxide (DMSO) and in a 1:3 mixtures by volume of 2-propanol and toluene. The coating of the synthesized PANI salt on stainless steel has shown good corrosion resistant behavior in marine water by reducing the corrosion rate to 67.9% as compared to uncoated stainless steel.
Highlights
Polyaniline (PANI) has been under intense investigation for the last few decades [1], in its different redox states, including pernigraniline, lecuemeraldine, emeraldine base and emeraldine salt
The % yield of PANI salt was found to be greatly affected by changing different parameters like amount of monomer, oxidant, dopant and solvents
A very slight difference has been observed in the extent of doping for different synthesized at different conditions. These results suggest that the extent of doping into PANI chain is samples synthesized at different conditions
Summary
Polyaniline (PANI) has been under intense investigation for the last few decades [1], in its different redox states, including pernigraniline, lecuemeraldine, emeraldine base and emeraldine salt. It has been synthesized by different methods including electrochemical [2], chemical oxidative [3] including emulsion [4], and inverse emulsion polymerization techniques [5]. Inverse emulsion polymerization is reported to be more effective because PANI obtained by this method possesses enhanced conductivity [6], solubility in common organic solvents [7], thermal stability, and good processability [8]. P.S. et al used chloroform as the dispersion medium and benzoyl peroxide as the oxidant and obtained a thermally stable and soluble PANI [6]
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