Synthesis of redox- responsive polyaniline microcapsules containing 8-hydroxyquinoline for corrosion protection of coatings.

Document Type : Research Article

Authors

1 Faculty of Polymer Engineering & color Technology, Amirkabir University of Technology.

2 Department of Polymer and Color Engineering, Amir Kabir University of Technology, Tehran, Iran

3 Ph.D. Student, Faculty of Polymer Engineering & color Technology, Amirkabir University of Technology.

/amnc.2020.9.34.6

Abstract

In this work, polyaniline (PANI) microcapsules were successfully synthesized by the oxidative polymerization in the direct mini-emulsion method. 8-hydroxyquinoline (8-HQ) was used as a corrosion inhibitor in the core of microcapsules, which can also act as a fluorescent indicator. The synthesized microcapsules were characterized by Field Emission Scanning Electron Microscopy (FE-SEM), Dynamic Light Scattering (DLS), Fourier Transform Infrared spectroscopy (FTIR), Thermal Gravimetric Analysis (TGA) and Ultraviolet-Visible spectroscopy (UV–Vis) techniques. The qualitative study of the corrosion resistance behavior of coatings containing microcapsules was performed using the salt spray test. The FE-SEM images were used to study the morphology of the surface of the microcapsules. According to FE-SEM images, the microcapsules with and without 8-HQ were almost identical in appearance, and the diameter of the spherical microcapsules was approximately 0.6-5 µm. The results of the DLS showed that the synthesized microcapsules are monodisperse and have a narrow distribution of particle size. The chemical structure of the microcapsules was investigated using FTIR spectroscopy. The results of the TGA analysis confirmed the formation of polyaniline microcapsules. The UV–Vis spectroscopy showed that polyaniline microcapsules are sensitive to reducing and oxidizing agents and are released by reduction-oxidation reactions. Since PANI microcapsules can exhibit an oxidation-reduction response to electrical or chemical stimuli, these particles could be an appropriate choice to be used in anti-corrosion and self-healing applications in metallic systems. The results of the salt spray test showed that the epoxy coating containing 5 wt.% of the microcapsules, has better corrosion resistance than the epoxy.

Keywords

References

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