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Polymers
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Self-Healing of Structural Composite Materials
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Self-Healing of Structural Composite Materials

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: closed (30 November 2021) | Viewed by 15186

Special Issue Editor

Dr. Min Wook Lee

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Guest Editor
Institute of Advanced Composite Materials, Korea Institute of Science and Technology (KIST), Chudong-ro 92, Bondong-eup, Wanju-gun, Jeollabuk-do 55324, Republic of Korea
Interests: fracture and recovery of composite materials; core–shell nanofiber; carbon-fiber-reinforced polymer (CFRP)
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nature-inspired self-healing strategies have been explored in biomimetic engineering designs, with the aim of restoring structural damages. In addition to the cracks on aircraft fuselage and nuclear power plant walls mentioned above, numerous structures require protection as human activities expand to such areas as submarine tunnels and spacecraft. In recent years, successful efforts have been made to develop and test a variety of self-healing materials, which are the focus of the current Special Issue. Here we discuss cutting-edge technologies in such materials and existing healing methods. This Special Issue highlights the advances and applications of novel self-healing on structural materials and their composites. We also welcome in-depth and comprehensive studies of the physico-chemical and mechanical foundations associated with this field.

Dr. Min Wook Lee
Guest Editor

Manuscript Submission Information

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Keywords

  • self-healing,
  • self-repair,
  • structural composite,
  • mechanical property

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Published Papers (4 papers)

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Research

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11 pages, 3187 KiB  
Article
Rapid and Local Self-Healing Ability of Polyurethane Nanocomposites Using Photothermal Polydopamine-Coated Graphene Oxide Triggered by Near-Infrared Laser
by Yu-Mi Ha, Young Nam Kim and Yong Chae Jung
Polymers 2021, 13(8), 1274; https://doi.org/10.3390/polym13081274 - 14 Apr 2021
Cited by 28 | Viewed by 4188
Abstract
In this study, we report the self-healing ability of polyurethane (PU) nanocomposites based on the photothermal effect of polydopamine-coated graphene oxide (PDA–rGO). Polydopamine (PDA) was coated on the graphene oxide (GO) surface, while simultaneously reducing GO by the oxidation of dopamine hydrochloride in [...] Read more.
In this study, we report the self-healing ability of polyurethane (PU) nanocomposites based on the photothermal effect of polydopamine-coated graphene oxide (PDA–rGO). Polydopamine (PDA) was coated on the graphene oxide (GO) surface, while simultaneously reducing GO by the oxidation of dopamine hydrochloride in an alkaline aqueous solution. The PDA–rGO was characterized by Fourier-transform infrared spectroscopy, X-ray diffraction, Raman spectroscopy, thermogravimetric analysis, and scanning electron microscopy–energy-dispersive X-ray analysis. PDA–rGO/PU nanocomposites with nanofiller contents of 0.1, 0.5 and 1 wt% were prepared by ex situ mixing method. The photothermal effect of the PDA–rGO in the PU matrix was investigated at 0.1 W/cm2 using an 808 nm near-infrared (NIR) laser. The photothermal properties of the PDA–rGO/PU nanocomposites were superior to those of the GO/PU nanocomposites, owing to an increase in the local surface plasmon resonance effect by coating with PDA. Subsequently, the self-healing efficiency was confirmed by recovering the tensile stress of the damaged nanocomposites using the thermal energy generated by the NIR laser. Full article
(This article belongs to the Special Issue Self-Healing of Structural Composite Materials)
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11 pages, 1348 KiB  
Article
Multi Self-Healable UV Shielding Polyurethane/CeO2 Protective Coating: The Effect of Low-Molecular-Weight Polyols
by Mohammad Mizanur Rahman, Rami Suleiman, Md. Hasan Zahir, Aasif Helal, A. Madhan Kumar and Md. Bashirul Haq
Polymers 2020, 12(9), 1947; https://doi.org/10.3390/polym12091947 - 28 Aug 2020
Cited by 11 | Viewed by 2513
Abstract
We prepared a series of polyurethane (PU) coatings with defined contents using poly(tetramethylene oxide)glycol (PTMG) with two different molecular weights (i.e., Mn = 2000 and 650), as well as polydimethyl siloxane (PDMS) with a molecular weight of Mn 550. For every [...] Read more.
We prepared a series of polyurethane (PU) coatings with defined contents using poly(tetramethylene oxide)glycol (PTMG) with two different molecular weights (i.e., Mn = 2000 and 650), as well as polydimethyl siloxane (PDMS) with a molecular weight of Mn 550. For every coating, maximum adhesive strength and excellent self-healing character (three times) were found using 6.775 mol% mixed with low-molecular-weight-based polyols (PU-11-3-3). Defined 1.0 wt% CeO2 was also used for the PU-11-3-3 coating (i.e., PU-11-3-3-CeO2) to obtain UV shielding properties. Both the in situ polymerization and blending processes were separately applied during the preparation of the PU-11-3-3-CeO2 coating dispersion. The in situ polymerization-based coating (i.e., PU-11-3-3-CeO2-P) showed similar self-healing properties. The PU-11-3-3-CeO2-P coating also showed excellent UV shielding in real outdoor exposure conditions. Full article
(This article belongs to the Special Issue Self-Healing of Structural Composite Materials)
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13 pages, 3050 KiB  
Article
Self-Healing EPDM Rubbers with Highly Stable and Mechanically-Enhanced Urea-Formaldehyde (UF) Microcapsules Prepared by Multi-Step In Situ Polymerization
by Hyeong-Jun Jeoung, Kun Won Kim, Yong Jun Chang, Yong Chae Jung, Hyunchul Ku, Kyung Wha Oh, Hyung-Min Choi and Jae Woo Chung
Polymers 2020, 12(9), 1918; https://doi.org/10.3390/polym12091918 - 25 Aug 2020
Cited by 8 | Viewed by 3287
Abstract
The mechanically-enhanced urea-formaldehyde (UF) microcapsules are developed through a multi-step in situ polymerization method. Optical microscope (OM) and field emission scanning electron microscope (FE-SEM) prove that the microcapsules, 147.4 μm in diameter with a shell thickness of 600 nm, are well-formed. From 1 [...] Read more.
The mechanically-enhanced urea-formaldehyde (UF) microcapsules are developed through a multi-step in situ polymerization method. Optical microscope (OM) and field emission scanning electron microscope (FE-SEM) prove that the microcapsules, 147.4 μm in diameter with a shell thickness of 600 nm, are well-formed. From 1H-nuclear magnetic resonance (1H-NMR) analysis, we found that dicyclopentadiene (DCPD), a self-healing agent encapsulated by the microcapsules, occupies ca. 40.3 %(v/v) of the internal volume of a single capsule. These microcapsules are mixed with EPDM (ethylene-propylene-diene-monomer) and Grubbs’ catalyst via a solution mixing method, and universal testing machine (UTM) tests show that the composites with mechanically-enhanced microcapsules has ca. 47% higher toughness than the composites with conventionally prepared UF microcapsules, which is attributed to the improved mechanical stability of the microcapsule. When the EPDM/microcapsule rubber composites are notched, Fourier-transform infrared (FT-IR) spectroscopy shows that DCPD leaks from the broken microcapsule to the damaged site and flows to fill the notched valley, and self-heals as it is cured by Grubbs’ catalyst. The self-healing efficiency depends on the capsule concentration in the EPDM matrix. However, the self-healed EPDM/microcapsule rubber composite with over 15 wt% microcapsule shows an almost full recovery of the mechanical strength and 100% healing efficiency. Full article
(This article belongs to the Special Issue Self-Healing of Structural Composite Materials)
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Other

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11 pages, 3317 KiB  
Perspective
Self-Healing Structural Materials
by Seongpil An, Sam S. Yoon and Min Wook Lee
Polymers 2021, 13(14), 2297; https://doi.org/10.3390/polym13142297 - 13 Jul 2021
Cited by 21 | Viewed by 4533
Abstract
Self-healing materials have been developed since the 1990s and are currently used in various applications. Their performance in extreme environments and their mechanical properties have become a topic of research interest. Herein, we discuss cutting-edge self-healing technologies for hard materials and their expected [...] Read more.
Self-healing materials have been developed since the 1990s and are currently used in various applications. Their performance in extreme environments and their mechanical properties have become a topic of research interest. Herein, we discuss cutting-edge self-healing technologies for hard materials and their expected healing processes. The progress that has been made, including advances in and applications of novel self-healing fiber-reinforced plastic composites, concrete, and metal materials is summarized. This perspective focuses on research at the frontier of self-healing structural materials. Full article
(This article belongs to the Special Issue Self-Healing of Structural Composite Materials)
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