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Synthesis of TiO2 nanogel composite for highly efficient self-healing epoxy coating
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.
Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
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.
Department of Chemistry, Isfahan University of Technology, Isfahan 84156-83111, Iran.
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2023 (English)In: Journal of Advanced Research, ISSN 2090-1232, Vol. 43, p. 137-146Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2023. Vol. 43, p. 137-146
Keywords [en]
Self-healing, Coatings, Hydrogels, Titanium dioxide, Nanogel composite
National Category
Materials Chemistry Bio Materials
Research subject
Structural Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-89837DOI: 10.1016/j.jare.2022.02.008ISI: 000913003400001PubMedID: 36585104Scopus ID: 2-s2.0-85125489737OAI: oai:DiVA.org:ltu-89837DiVA, id: diva2:1646889
Note

Validerad;2023;Nivå 2;2023-02-22 (joosat);

Available from: 2022-03-24 Created: 2022-03-24 Last updated: 2023-02-22Bibliographically approved

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