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Coatings
Special Issues
Self-Healing Coatings and Films
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Self-Healing Coatings and Films

A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: closed (30 November 2020) | Viewed by 14652

Special Issue Editor

Prof. Dr. Chan-Moon Chung

E-Mail Website
Guest Editor
Department of Chemistry and Medical Chemistry, Yonsei University Mirae Campus, Wonju, Korea
Interests: polyimides; self-healing polymers; nanocomposites
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Self-healing materials are defined as artificial materials that can self-heal after being damaged. Recently, they have attracted much attention because they can extend material lifetime, reduce maintenance costs, and enhance public safety. Self-healing coatings have been extensively studied due to the increased importance of maintaining the performance of protection of the underlying substrate. Self-healing films have been developed for potential applications in artificial skin, solar cells, electrical circuits, electrolytes, gas barriers and so on.

This Special Issue is dedicated to recent advances in the research and development of self-healing coatings and films. Original research papers and review articles on the latest research work from worldwide leading research groups are invited.

In particular, the topics of interest include, but are not limited to:

  • Self-healing polymers, ceramics or metals
  •  Extrinsic or intrinsic types

Prof. Dr. Chan-Moon Chung
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Coatings is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (4 papers)

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Research

11 pages, 3528 KiB  
Article
Healing Performance of a Self-Healing Protective Coating According to Damage Width
by Dong-Min Kim, Junseo Lee, Ju-Young Choi, Seung-Won Jin, Kyeong-Nam Nam, Hyeong-Ju Park, Seung-Hyun Lee and Chan-Moon Chung
Coatings 2020, 10(6), 543; https://doi.org/10.3390/coatings10060543 - 03 Jun 2020
Cited by 9 | Viewed by 2912
Abstract
Although self-healing protective coatings have been widely studied, systematic research on healing performance of the coating according to damage width has been rare. In addition, there has been rare reports of self-healing of the protective coating having damage width wider than 100 µm. [...] Read more.
Although self-healing protective coatings have been widely studied, systematic research on healing performance of the coating according to damage width has been rare. In addition, there has been rare reports of self-healing of the protective coating having damage width wider than 100 µm. In this study, self-healing performance of a microcapsule type self-healing protective coating on cement mortar was studied for the coating with damage width of 100–300 µm. The effect of capsule-loading (20 wt%, 30 wt% and 40 wt%), capsule size (65-, 102- and 135-µm-mean diameter) and coating thickness (50-, 80- and 100-µm-thick undercoating) on healing efficiency was investigated by water sorptivity test. Accelerated carbonation test, chloride ion penetration test and scanning electron microscope (SEM) study were conducted for the self-healing coating with a 300-µm-wide damage. Healing efficiency of the self-healing coating decreased with increasing damage width. As capsule-loading, capsule size or coating thickness increased, healing efficiency of the self-healing coating increased. Healing efficiency of 76% or higher was achieved using the self-healing coating with a 300-µm-wide scratch. The self-healing coating with a 200-µm-wide crack showed healing efficiency of 70% or higher. The self-healing coating having a 300-µm-wide scratch showed effective protection of the substrate mortar from carbonation and chloride ion penetration, which was supported by SEM study. Full article
(This article belongs to the Special Issue Self-Healing Coatings and Films)
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11 pages, 4494 KiB  
Article
Design Strategy for Self-Healing Epoxy Coatings
by Dian Yuan, Vahab Solouki Bonab, Ammar Patel, Talha Yilmaz, Richard A. Gross and Ica Manas-Zloczower
Coatings 2020, 10(1), 50; https://doi.org/10.3390/coatings10010050 - 06 Jan 2020
Cited by 10 | Viewed by 4621
Abstract
Self-healing strategies including intrinsic and extrinsic self-healing are commonly used for polymeric materials to restore their appearance and properties upon damage. Unlike intrinsic self-healing tactics where recovery is based on reversible chemical or physical bonds, extrinsic self-healing approaches rely on a secondary phase [...] Read more.
Self-healing strategies including intrinsic and extrinsic self-healing are commonly used for polymeric materials to restore their appearance and properties upon damage. Unlike intrinsic self-healing tactics where recovery is based on reversible chemical or physical bonds, extrinsic self-healing approaches rely on a secondary phase to acquire the self-healing functionality. Understanding the impacts of the secondary phase on both healing performance and matrix properties is important for rational system design. In this work, self-healing coating systems were prepared by blending a bio-based epoxy from diglycidyl ether of diphenolate esters (DGEDP) with thermoplastic polyurethane (TPU) prepolymers. Such systems exhibit polymerization induced phase separation morphology that controls coating mechanical and healing properties. Structure–property analysis indicates that the degree of phase separation is controlled by tuning the TPU prepolymer molecular weight. Increasing the TPU prepolymer molecular weight results in a highly phase separated morphology that is preferable for mechanical performances but undesirable for healing functionality. In this case, diffusion of TPU prepolymers during healing is restricted by the epoxy network rigidity and chain entanglement. Low molecular weight TPU prepolymers tend to phase mix with the epoxy matrix during curing, resulting in the formation of a flexible epoxy network that benefits TPU flow while decreasing Tg and mechanical properties. This work describes a rational strategy to develop self-healing coatings with controlled morphology to extend their functions and tailor their properties for specific applications. Full article
(This article belongs to the Special Issue Self-Healing Coatings and Films)
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Graphical abstract

10 pages, 2942 KiB  
Article
Multiple Hydrogen-Bonding Assisted Scratch–Healing of Transparent Coatings
by Dalius Jucius, Algirdas Lazauskas and Rimantas Gudaitis
Coatings 2019, 9(12), 796; https://doi.org/10.3390/coatings9120796 - 26 Nov 2019
Cited by 4 | Viewed by 2292
Abstract
The partial cross-linking reaction of poly(vinyl alcohol) (PVA) by esterification using poly(acrylic acid) (PAA) as a cross-linking agent was performed to obtain a PVA–PAA supramolecular polymer complex. The PVA–PAA coatings with a different molar ratio between hydroxyl and carboxyl groups were prepared to [...] Read more.
The partial cross-linking reaction of poly(vinyl alcohol) (PVA) by esterification using poly(acrylic acid) (PAA) as a cross-linking agent was performed to obtain a PVA–PAA supramolecular polymer complex. The PVA–PAA coatings with a different molar ratio between hydroxyl and carboxyl groups were prepared to examine scratch–healing ability. These coatings exhibited high optical transparency and excellent scratch–healing properties, which are attributed to considerable amount of free hydroxyl groups at the scratched interfaces to reversibly form multiple hydrogen bonds. Importantly, the PVA–PAA polymer was capable of initiating scratch recovery at temperature of 20 °C and relative humidity (RH) of 40%. Scratches produced on the PVA–PAA polymer coatings with different constant loading in the range of 1.5–2.7 N were healed significantly more rapidly under humid conditions (RH = 99%). Increase of cross-linking temperature also resulted in similar effect but with some reduction of the final scratch healing ratio. Full article
(This article belongs to the Special Issue Self-Healing Coatings and Films)
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13 pages, 3790 KiB  
Article
A Self-Healing Coating with UV-Shielding Property
by Lei Peng, Musong Lin, Sheng Zhang, Li Li, Qiang Fu and Junbo Hou
Coatings 2019, 9(7), 421; https://doi.org/10.3390/coatings9070421 - 01 Jul 2019
Cited by 12 | Viewed by 4242
Abstract
A self-healing coating with UV-shielding property was prepared in this paper. The self-healing property was based on the inclusion between a host (β-CD-TiO2) and a guest HEMA-Ad). After inclusion of the host and guest, the host–guest complex (HEMA-Ad/β-CD-TiO2) was [...] Read more.
A self-healing coating with UV-shielding property was prepared in this paper. The self-healing property was based on the inclusion between a host (β-CD-TiO2) and a guest HEMA-Ad). After inclusion of the host and guest, the host–guest complex (HEMA-Ad/β-CD-TiO2) was polymerized with other reactive monomers (HEMA and BA) to obtain the final coating. The coating had good hydrophobicity (water contact angle >90°, moisture absorption rate <2%) and excellent UV-shielding performance (ultra-violet protect factor >90%), and could be firmly bonded to a soft substrate. In addition, the coating had good self-healing property, which means that cracks in the material can recover many times after being damaged and that the UV-shielding ability can be fully restored with the self-healing process. Full article
(This article belongs to the Special Issue Self-Healing Coatings and Films)
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