Special Issue "Polymeric Self-Healing Materials"

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

Deadline for manuscript submissions: 30 January 2020.

Special Issue Editors

Dr. Marialuigia Raimondo
E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Salerno, 84084 Fisciano, SA, Italy
Interests: physico-chemical properties, structure, morphology and durability of macromolecular systems; design and development of smart and/or nanostructured materials; synthesis of self-healing microcapsules; multifunctional carbon-based hybrid materials for aircraft lightning strike protection; thermosetting composites with self-restoration function capable at very low temperatures; conductive and flame retardant nanofilled aeronautic composites; FTIR spectroscopy; morphological analysis by Atomic Force Microscopy (AFM) and Tunneling Atomic Force Microscopy (TUNA) techniques.
Dr. Andrea Sorrentino
E-Mail Website
Guest Editor
Institute of Polymers, Composites and Biomaterials (IPCB), National Research Council of Italy (CNR), Via Previati 1/C, 23900 Lecco, Italy
Interests: process–properties relashionships; morphology and properties of polymeric materials; polymer processing; injection and compression moulding; nanofunctionalized polymer materials for barrier and electrical applications; polymer (bio/photo)-degradation; bionanocomposites materials; thermomechanical properties; biodegradable materials; high performances composite materials; materials for sensing; materials for drug delivery; self-healing materials
Special Issues and Collections in MDPI journals

Special Issue Information

Dear Colleagues,

A self-healing material has the ability to restore lost or degraded performance using resources inherently available in the material itself. Ideally, this ability should be fast and be able to occur for an infinite number of cycles without any external stimuli. Unfortunately, persistent irreversible mechanisms, low chemical stability, and weak mechanical performance mean that the present systems are far from having these capabilities.

Polymers are the materials most broadly used in daily life. They have several advantages, such as inexpensive cost, good processability, and low density. The incorporation of self-healing mechanisms in polymeric materials promises to further expand their use by extending the lifetime of structural and functional polymer-based systems. This Special Issue aims to represent the state of the art and provide systematic information on self-healing mechanisms, characterization techniques, and structure–property relationships. We hope to provide the community with new ideas and perspectives, as we are firmly convinced that these bioinspired materials can be applied in most modern engineering applications.

Dr. Marialuigia Raimondo
Dr. Andrea Sorrentino
Guest Editors

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 papers will be 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. Polymers 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 1500 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.

Keywords

  • self-healing materials
  • bioinspired materials
  • healing mechanisms
  • supramolecular self-healing
  • capsule-based self-healing materials
  • intrinsic self-healing materials
  • vascular self-healing materials
  • characterization techniques of healing performance
  • self-healable fiber-reinforced resins for aerospace applications
  • self-healing conductive epoxy systems

Published Papers (4 papers)

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Research

Open AccessArticle
Dual-Layer Approach toward Self-Healing and Self-Cleaning Polyurethane Thermosets
Polymers 2019, 11(11), 1849; https://doi.org/10.3390/polym11111849 - 09 Nov 2019
Abstract
There is an urgent need for coatings that exhibit both self-healing as well as self-cleaning properties as they can be used for a wide range of applications. Herein we report a novel approach toward fabricating polyurethane thermosets possessing both self-cleaning and self-healing properties. [...] Read more.
There is an urgent need for coatings that exhibit both self-healing as well as self-cleaning properties as they can be used for a wide range of applications. Herein we report a novel approach toward fabricating polyurethane thermosets possessing both self-cleaning and self-healing properties. The desired coating was achieved via casting a bottom layer of self-healable polyurethanes comprised of reversible phenolic urethane bonds followed by a subsequent dip-coating of the prepared layer in a solution of bis(3-aminopropyl)-terminated polydimethylsiloxane (PDMS-NH2). The PDMS was used to impart self-cleaning properties to the coating. While the self-healing behavior of the bottom polyurethane layer is achieved through phenolic urethane chemistry, via the exchange of phenolic urethane moieties. The prepared coatings were tested for their optical, mechanical, self-healing, and self-cleaning properties using a variety of characterization methods, which confirmed the successful fabrication of novel self-cleaning and self-healing clear urethane coatings. Full article
(This article belongs to the Special Issue Polymeric Self-Healing Materials)
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Open AccessArticle
The Mechanical Properties of Poly (Urea-Formaldehyde) Incorporated with Nano-SiO2 by Molecular Dynamics Simulation
Polymers 2019, 11(9), 1447; https://doi.org/10.3390/polym11091447 - 04 Sep 2019
Abstract
Self-healing materials can promote the sustainable reuse of resources. Poly (urea-formaldehyde) (PUF) microcapsules can be incorporated into dielectric materials for self-healing. However, the mechanical properties of PUF microcapsules need to be improved due to insufficient hardness. In this paper, PUF models incorporated with [...] Read more.
Self-healing materials can promote the sustainable reuse of resources. Poly (urea-formaldehyde) (PUF) microcapsules can be incorporated into dielectric materials for self-healing. However, the mechanical properties of PUF microcapsules need to be improved due to insufficient hardness. In this paper, PUF models incorporated with nano-SiO2 of different filler concentrations (0, 2.6, 3.7, 5.3, 6.7, 7.9 wt.%) were designed. The density, the fractional free volume, and the mechanical properties of the PUF-SiO2 models were analyzed at an atomic level based on molecular dynamics simulation. The interfacial interaction model of PUF on the SiO2 surface was also constructed to further investigate the interaction mechanisms. The results showed that the incorporation of nano-SiO2 had a significant effect on the mechanical properties of PUF. Density increased, fractional free volume decreased, and mechanical properties of the PUF materials were gradually enhanced with the increase of nano-SiO2 concentration. This trend was also confirmed by experimental tests. By analyzing the internal mechanism of the PUF–SiO2 interfacial interaction, it was found that hydrogen bonds play a major role in the interaction between PUF and nano-SiO2. Moreover, hydrogen bonds can be formed between the polar atoms of the PUF chain and the hydroxyl groups (–OH) as well as O atoms on the surface of SiO2. Hydrogen bonds interactions are involved in adsorption of PUF chains on the SiO2 surface, reducing the distance between PUF chains and making the system denser, thus enhancing the mechanical properties of PUF materials. Full article
(This article belongs to the Special Issue Polymeric Self-Healing Materials)
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Open AccessArticle
Self-Healing Anti-Atomic-Oxygen Phosphorus-Containing Polyimide Film via Molecular Level Incorporation of Nanocage Trisilanolphenyl POSS: Preparation and Characterization
Polymers 2019, 11(6), 1013; https://doi.org/10.3390/polym11061013 - 07 Jun 2019
Abstract
Protection of polymeric materials from the atomic oxygen erosion in low-earth orbit spacecrafts has become one of the most important research topics in aerospace science. In the current research, a series of novel organic/inorganic nanocomposite films with excellent atomic oxygen (AO) resistance are [...] Read more.
Protection of polymeric materials from the atomic oxygen erosion in low-earth orbit spacecrafts has become one of the most important research topics in aerospace science. In the current research, a series of novel organic/inorganic nanocomposite films with excellent atomic oxygen (AO) resistance are prepared from the phosphorous-containing polyimide (FPI) matrix and trisilanolphenyl polyhedral oligomeric silsesquioxane (TSP–POSS) additive. The PI matrix derived from 2,2’-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride (6FDA) and 2,5-bis[(4-amino- phenoxy)phenyl]diphenylphosphine oxide (BADPO) itself possesses the self-healing feature in AO environment. Incorporation of TSP–POSS further enhances the AO resistance of the FPI/TSP composite films via a Si–P synergic effect. Meanwhile, the thermal stability of the pristine film is maintained. The FPI-25 composite film with a 25 wt % loading of TSP–POSS in the FPI matrix exhibits an AO erosion yield of 3.1 × 10−26 cm3/atom after an AO attack of 4.0 × 1020 atoms/cm2, which is only 5.8% and 1.0% that of pristine FPI-0 film (6FDA-BADPO) and PI-ref (PMDA-ODA) film derived from 1,2,4,5-pyromellitic anhydride (PMDA) and 4,4’-oxydianline (ODA), respectively. Inert phosphorous and silicon-containing passivation layers are observed at the surface of films during AO exposure. Full article
(This article belongs to the Special Issue Polymeric Self-Healing Materials)
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Open AccessArticle
Reversible Self-Healing Carbon-Based Nanocomposites for Structural Applications
Polymers 2019, 11(5), 903; https://doi.org/10.3390/polym11050903 - 17 May 2019
Cited by 1
Abstract
Reversible Hydrogen Bonds (RHB) have been explored to confer self-healing function to multifunctional nanocomposites. This study has been carried out through a sequence of different steps. Hydrogen bonding moieties, with the intrinsic ability to simultaneously perform the functions of both hydrogen donors and [...] Read more.
Reversible Hydrogen Bonds (RHB) have been explored to confer self-healing function to multifunctional nanocomposites. This study has been carried out through a sequence of different steps. Hydrogen bonding moieties, with the intrinsic ability to simultaneously perform the functions of both hydrogen donors and acceptors, have been covalently attached to the walls of carbon nanotubes. The epoxy matrix has been modified to adapt the formulation for hosting self-healing mechanisms. It has been toughened with different percentages of rubber phase covalently linked to the epoxy precursor. The most performant matrix, from the mechanical point of view, has been chosen for the incorporation of MWCNTs. Self-healing performance and electrical conductivities have been studied. The comparison of data related to the properties of nanocomposites containing incorporated functionalized and nonfunctionalized MWCNTs has been performed. The values of the electrical conductivity of the self-healing nanocomposites, containing 2.0% by weight of functionalized multiwalled carbon nanotubes (MWCNTs), range between 6.76 × 10−3 S/m and 3.77 × 10−2 S/m, depending on the nature of the functional group. Curing degrees, glass transition temperatures, and storage moduli of the formulated multifunctional nanocomposites prove their potential for application as functional structural materials. Full article
(This article belongs to the Special Issue Polymeric Self-Healing Materials)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

  • Facile Strategy toward the Development of a Self-Healing Coating by Electrospray Method
    Mohammad Sadegh Koochaki, et al.

  • Dual-Layer Approach toward Self-Healing and Self-Cleaning Polyurethane Thermosets
    Muhammad Rabnawaz, et al.

  • Heat Driven Self-Healing Isocyanate-based Crosslinked Three-arm Star-shaped Polyglycolide Based on Dynamic Transesterification
    Qi Fu, et al.
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