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.
Highlights
Living organisms play a crucial role in sustaining and prolonging life via self-healing mechanisms [1,2,3,4]
Inspired by nature, self-healing materials are at the forefront of recent development [5,6,7,8,9,10,11,12], and a substantial amount of research work has been dedicated to developing self-healing coatings that can restore the fundamental properties of the material [13,14,15,16,17]
This review focuses mainly on intrinsic self-healing synthetic polymers and coatings via hydrogen bonding interactions that dissociate and re-associate at moderate to room temperature (RT), leading to self-healing behavior
Summary
Living organisms play a crucial role in sustaining and prolonging life via self-healing mechanisms [1,2,3,4]. On the other hand, coatings and other synthesized materials are generally susceptible to damage, degradation, and delamination by external factors This process contributes to limiting its lifetime, there is a need for continuous monitoring of damage to increase the lifetime of the material by repairing, re-coating, and replacing. Intrinsic self-healing based on supramolecular interactions includes H-bonding interactions [35], ionic interactions [36], metal-ligand coordination [37], π–π stacking [38], and host-guest interaction [39]. Upon mechanical damage, these bonds dissociate due to the weak nature of supramolecular interactions. Self-healing materials based on the extrinsic mechanism do not fall into the scope of this review; interested readers can refer to several review articles about extrinsic self-healing [41,42,43]
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