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Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures

The thermally-induced self-healing behavior of polymer coatings consists of two steps, i.e., gap closure and crack repair. In addition, the polymer coatings with thermally-induced self-healing capability are expected to show satisfied properties to ensure the application. Here, four epoxy coatings w...

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Detalles Bibliográficos
Autores principales: Fang, Liang, Chen, Jiamei, Zou, Yuting, Xu, Zhongzi, Lu, Chunhua
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419000/
https://www.ncbi.nlm.nih.gov/pubmed/30971008
http://dx.doi.org/10.3390/polym9080333
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author Fang, Liang
Chen, Jiamei
Zou, Yuting
Xu, Zhongzi
Lu, Chunhua
author_facet Fang, Liang
Chen, Jiamei
Zou, Yuting
Xu, Zhongzi
Lu, Chunhua
author_sort Fang, Liang
collection PubMed
description The thermally-induced self-healing behavior of polymer coatings consists of two steps, i.e., gap closure and crack repair. In addition, the polymer coatings with thermally-induced self-healing capability are expected to show satisfied properties to ensure the application. Here, four epoxy coatings with dense irreversible Network I, dense reversible Network II based on a Diels–Alder (DA) reaction, loose irreversible Network III, as well as partially irreversible and partially reversible Network IV were prepared, respectively. The dense irreversible Network I showed an evident gap closure upon heating, while the crack still existed at the high temperature. The dense reversible Network II presented good self-healing upon direct heating at a high temperature of 150 °C, leading to the quick gap closure in 40 s and subsequent crack disappearance in 80 s. The loose irreversible Network III showed negligible crack variations upon heating, while the partially reversible and partially irreversible Network IV showed quick gap closure as well but only partial crack disappearance. Besides, the coating with the reversible Network II based on the DA reaction not only presented good self-healing capability but also possessed the satisfied mechanical properties and the best electrochemical corrosion property, ensuring its further exploitation and potential practical applications.
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spelling pubmed-64190002019-04-02 Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures Fang, Liang Chen, Jiamei Zou, Yuting Xu, Zhongzi Lu, Chunhua Polymers (Basel) Article The thermally-induced self-healing behavior of polymer coatings consists of two steps, i.e., gap closure and crack repair. In addition, the polymer coatings with thermally-induced self-healing capability are expected to show satisfied properties to ensure the application. Here, four epoxy coatings with dense irreversible Network I, dense reversible Network II based on a Diels–Alder (DA) reaction, loose irreversible Network III, as well as partially irreversible and partially reversible Network IV were prepared, respectively. The dense irreversible Network I showed an evident gap closure upon heating, while the crack still existed at the high temperature. The dense reversible Network II presented good self-healing upon direct heating at a high temperature of 150 °C, leading to the quick gap closure in 40 s and subsequent crack disappearance in 80 s. The loose irreversible Network III showed negligible crack variations upon heating, while the partially reversible and partially irreversible Network IV showed quick gap closure as well but only partial crack disappearance. Besides, the coating with the reversible Network II based on the DA reaction not only presented good self-healing capability but also possessed the satisfied mechanical properties and the best electrochemical corrosion property, ensuring its further exploitation and potential practical applications. MDPI 2017-08-02 /pmc/articles/PMC6419000/ /pubmed/30971008 http://dx.doi.org/10.3390/polym9080333 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Fang, Liang
Chen, Jiamei
Zou, Yuting
Xu, Zhongzi
Lu, Chunhua
Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures
title Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures
title_full Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures
title_fullStr Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures
title_full_unstemmed Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures
title_short Thermally-Induced Self-Healing Behaviors and Properties of Four Epoxy Coatings with Different Network Architectures
title_sort thermally-induced self-healing behaviors and properties of four epoxy coatings with different network architectures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6419000/
https://www.ncbi.nlm.nih.gov/pubmed/30971008
http://dx.doi.org/10.3390/polym9080333
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