Synthesis and characterization of polyaniline nanoparticles in phosphonic acid amphiphile aqueous micellar solutions for waterborne corrosion protection coatings

Abstract

Polyaniline (PANI) dispersions consisting of 270 to 380 nm sized particles were prepared by oxidation with ammonium peroxydisulfate (APS) in n‐decylphosphonic acid (DPA) micellar solutions. The green dispersions do not undergo macroscopic precipitation for more than a year. The synthesized DPA doped PANI exhibited enhanced electrical conductivity (3.6 S cm−1) compared with DPA‐PANI (2.3 x 10−4 S cm−1) prepared by postsynthesis treatment of the PANI‐base with DPA. It was shown that through protonation with decylphosphonic acid, polyaniline showed a significantly enhanced solubility in common organic solvents like chloroform, xylene, etc. The synthesized PANI was characterized by intrinsic viscosity, solubility, FT‐IR, conductivity, SEM, and TGA measurements. The wide‐angle X‐ray diffraction study revealed the appearance of a peak located at low angles (d = 29.4–35.3 Å) suggesting the formation of layered structure of PANI backbone separated by long alkyl side chains of DPA. The anticorrosive performance of the bilayer coatings composed of a bottom layer of DPA doped polyaniline covered with a polyvinyl butyral topcoat, have been demonstrated for steel exposed to neutral saline solutions. It was found that the inhibitive properties of DPA dopant provides further protection to the base metal through smart release when damage is produced on the surface of the coating. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015, 53, 1606–1616

Synthesis, characterization and investigation of methyl orange dye removal from aqueous solutions using waterborne poly vinyl pyrrolidone (PVP) stabilized poly aniline (PANI) core–shell nanoparticles

“…Release of inorganic dopant occurs in the next consecutive step between 150-400 C. The degradation is complete in the third step of thermogram with the loss of PVP stabilizer and PANI backbone structure. [54][55][56] Fig. 4 shows the UV-Vis spectrum of polymerization recorded in each 50 minutes of reaction progress.…”

A review of advances in the preparation and application of polyaniline based thermoset blends and composites

“…Lately, long-chain alkyl phosphonic acid-stabilized colloidal polyaniline dispersive system are synthesized and coated on the steel substrate as a primer. In this system alkyl phosphonic acid (ndecylphosphonic acid, DPA) are seen to act both as a surfactant and as a corrosion-inhibitive dopant [96].…”

Doping effects of cerium ion on structure and electrochemical properties of polyaniline

“…[1][2][3][4][5] As shown in numerous reports, PANI has potential applications as electrode material in energy storage, electromagnetic shielding material in biosensors, anticorrosion coatings and so on. [6][7][8][9] However, it is difficult to meet the requirements in all industries with PANI alone. Up to now, many PANI-based composites such as PANI/Ag, 10,11 PANI/Au 12 and PANI/Zn 13,14 have shown great performance.…”