Self‐healing Polymers through Dynamic Covalent Chemistry

Chapter 9 Self-healing Polymers through Dynamic Covalent Chemistry Keiichi Imato, Keiichi ImatoSearch for more papers by this authorHideyuki Otsuka, Hideyuki OtsukaSearch for more papers by this author Keiichi Imato, Keiichi ImatoSearch for more papers by this authorHideyuki Otsuka, Hideyuki OtsukaSearch for more papers by this author Book Editor(s):Wei Zhang, Wei Zhang Department of Chemistry and Biochemistry, University of Colorado, USASearch for more papers by this authorYinghua Jin, Yinghua Jin Department of Chemical and Biological Engineering and Department of Chemistry and Biochemistry, University of Colorado, USASearch for more papers by this author First published: 08 September 2017 https://doi.org/10.1002/9781119075738.ch9Citations: 6 AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onFacebookTwitterLinked InRedditWechat Summary This chapter exploits numerous types of reversible systems based on dynamic covalent chemistry for self-healing properties in polymeric materials. The reversibility of condensation reactions is typically controlled by varying pH. As a result, the reactions are often used in aqueous solutions and hydrogels. Numerous self-healing hydrogels and organogels utilizing reversible condensation reactions have been reported. Radical transfer and crossover reactions have been used to fabricate self-healing polymeric materials in which light can be applied locally to a damaged site. Hence, objects can, in principle, be healed even under load using such reactions. High self-healing ability involves strenuous molecular motion of dynamic units, while good mechanical properties need to restrain the mobility of polymer chains. To overcome this difficulty, various approaches have been examined, including hard-soft phase separation, where dynamic units are incorporated in the soft phase, introduction of crystalline components, composites with nanomaterials, and utilization of sacrificial bonds. Citing Literature Dynamic Covalent Chemistry: Principles, Reactions, and Applications RelatedInformation