A Brief Overview on Preparation of Self-Healing Polymers and Coatings via Hydrogen Bonding Interactions

Abstract

Self-healing coatings or materials have received significant importance in paint, coating, and other industries, as well as in academia, because of their capability to extend materials service life, improving protection, and ensuring sustainability. This review article emphasizes significant advances accomplished in the preparation and properties of intrinsic self-healing materials exclusively based on hydrogen bonding interactions, with possible applications in coatings and adhesives. The main topic of discussion in this review article is the preparation, healing conditions, healing efficiency, and mechanical property recovery after healing. The last part of the review discusses the conclusions and outlook of self-healing materials.

Self-Healing Polymers and Composite Materials

“…Nevertheless, these bonds can re-associate with minimal external trigger. Intrinsic self-healing systems based on supramolecular interactions present as major benefit the ability to self-heal at low temperatures, near to room temperature [34]. However, the dynamic nature of the reversible bonds implies in temperature-dependent behavior, and the long-term mechanical stability is an issue.…”

“…Polymers network with covalent reversible bonds, on the other hand, potentially are able to operate in a higher temperature range, presenting more mechanical properties stability, but require higher temperatures for healing activation. In addition, the design of reversible polymer networks can involve long, expensive, and complex synthesis steps [33,34].…”

Influence of Hybrid Sol-Gel Crosslinker on Self-Healing Properties for Multifunctional Coatings

“…Performant self-healing anticorrosive coatings could be an interesting alternative to previous toxic chromated surface treatments thanks to their extended lifetime protection offered by the recovery of their barrier properties after damage. A wide variety of studies on intrinsic self-healing, also called adaptive covalent network polymers has been published since their discovery by Leibler in 2011 [8], based on different recombination reactions using disulfide metathesis (Figure 1c) [9], hydrogen bonds [10,11] or the Diels-Alder reversible reaction, for example [12]. Lafont [13], Pepels [14], Zadeh [15,16] and more recently Song [17] described self-healing polymers based on disulfide-thiol exchange reactions, easy to synthetize and capable of recovering their mechanical properties after exposition to heat.…”

UV-Protected Polyurethane/f-Oil Fly Ash-CeO2 Coating: Effect of Pre-Mixing f-Oil Fly Ash-CeO2 with Monomers

“…PU coatings are widely used in both indoor and outdoor applications. In particular, their self-healing nature, sufficient mechanical strength and excellent barrier resistance make PU coatings a highly valuable option in many outdoor applications [ 2 , 3 , 6 ].…”