Synthesis of TiO2 nanogel composite for highly efficient self-healing epoxy coating

Erfan Rezvani Ghomi; Saied Nouri Khorasani; Mohammad Sadegh Koochaki; Mohammad Dinari; Shahla Ataei; Mohammad Hossein Enayati; Oisik Das; Rasoul Esmaeely Neisiany

Journal of Advanced Research (Jan 2023)

Synthesis of TiO2 nanogel composite for highly efficient self-healing epoxy coating

Erfan Rezvani Ghomi,
Saied Nouri Khorasani,
Mohammad Sadegh Koochaki,
Mohammad Dinari,
Shahla Ataei,
Mohammad Hossein Enayati,
Oisik Das,
Rasoul Esmaeely Neisiany

Affiliations

Erfan Rezvani Ghomi: Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Center for Nanotechnology and Sustainability, Department of Mechanical Engineering, National University of Singapore, Singapore 117581, Singapore
Saied Nouri Khorasani: Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Corresponding authors.
Mohammad Sadegh Koochaki: Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Research and Development Department, Alvan Paint & Resin Production Co., Tehran, 13991-53611, Iran
Mohammad Dinari: Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran
Shahla Ataei: Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
Mohammad Hossein Enayati: Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
Oisik Das: Structural and Fire Engineering Division, Department of Civil, Environmental and Natural Resources Engineering, Luleå University of Technology, 97187 Luleå, Sweden; Corresponding authors.
Rasoul Esmaeely Neisiany: Department of Materials and Polymer Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar 9617976487, Iran; Corresponding authors.

Journal volume & issue: Vol. 43
pp. 137 – 146

Abstract

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Introduction: Organic coatings are the most effective and facile methods of protecting steel against corrosion, which shields it from direct contact with oxygen and moisture. However, they are inherently defective and susceptible to damage, which allows the penetration of the corrosive media into the underlying substrates. Self-healing coatings were developed to address this shortcoming. Objective: The current research aims to develop a coating with superior self-healing ability via embedment of titanium dioxide (TiO2) nanogel composite (NC) in a commercial epoxy. Methods: The TiO2 NC was prepared by efficient dispersion of TiO2 nanoparticles in copolymer gel of acrylamide (AAm) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) with the help of 3-(trimethoxysilyl) propyl methacrylate (MPS). The chemical structure, morphology, and thermal properties of the modified and functionalized nanoparticles were assessed by infrared spectroscopy, electron microscopy, X-ray diffraction, and thermogravimetric analysis, respectively. In addition, TiO2 nanoparticles, nano-TiO2 functionalized monomer (NTFM), and NTFM/AAm/AMPS in different weight percentages were incorporated into epoxy resin to prepare a self-healing coating. Results: The results confirmed the successful fabrication of the NC. In addition, the incorporation of 1 wt% NTFM/AAm/AMPS led to homogenous dispersion, enhanced anti-corrosive and self-healing performance with the healing efficiencies of 100% and 98%, which were determined by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods, respectively. Conclusion: The prepared NC was sensitive towards salt concentration, pH, which aids the quick reaction of the TiO2 NC to corrosive ions, once the cracks occur. In addition, this is a unique feature compared to the other self-healing mechanisms, especially, the encapsulation of healing agents, which can be effective as long as the healing agent is present.

Published in Journal of Advanced Research

ISSN: 2090-1232 (Print); 2090-1224 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Medicine: Medicine (General); Science: Science (General)
Website: http://www.journals.elsevier.com/journal-of-advanced-research/

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