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Dynamic covalent urea bonds and their potential for development of self-healing polymer materials

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Dynamic covalent urea bonds and their potential for development of self-healing polymer materials

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dc.contributor.author	Wang, Zhanhua
dc.contributor.author	Gangarapu, Satesh
dc.contributor.author	Escorihuela Fuentes, Jorge
dc.contributor.author	Fei, Guoxia
dc.contributor.author	Zuilhof, Han
dc.contributor.author	Xia, Hesheng
dc.date.accessioned	2019-09-20T13:33:43Z
dc.date.available	2019-09-20T13:33:43Z
dc.date.issued	2019
dc.identifier.citation	Wang, Zhanhua Gangarapu, Satesh Escorihuela Fuentes, Jorge Fei, Guoxia Zuilhof, Han Xia, Hesheng 2019 Dynamic covalent urea bonds and their potential for development of self-healing polymer materials Journal Of Materials Chemistry a 7 26 15933 15943
dc.identifier.uri	https://hdl.handle.net/10550/71556
dc.description.abstract	Self-healing polymer materials have drawn rapidly increasing interest over the last decade, and have been studied and used in an ever-increasing range of applications. Herein, we successfully make the covalent urea bond - a pinnacle of stability due to strong resonance effects - dynamic in nature through mediation of zinc salts. The dynamic covalent character of urea in the presence of zinc ions is confirmed through dissociation reaction experiments and quantum chemical calculations of small-molecule model urea compounds. In line with our experiments, the modelling results suggest that the presence of zinc ions speeds up the reaction of urea dissociation by two orders of magnitude via the formation of Obound Zn complexes. Based on such dynamic covalent urea bonds, we then develop a novel class of self-healing polymer materials with excellent healing efficiencies. Different kinds of self-healing and reprocessable polyurea materials were prepared, with polymer properties that can be easily tuned by varying the degree of crosslinking and the molecular weight of the siloxane precursor. Since different kinds of self-healing polyurea materials could easily be prepared due to the commercial availability of a very wide range of amine and isocyanate monomers, this introduction of self-healing properties is expected to have significant potential in a range of applications, such as coatings, paints, and 3D printing. In addition, this introduces polyureas and other urea-containing polymers as a class of highly stable, yet easily reprocessable plastics, which is highly relevant given the globally desired more sustainable use of plastics.
dc.language.iso	eng
dc.relation.ispartof	Journal Of Materials Chemistry a, 2019, vol. 7, num. 26, p. 15933-15943
dc.subject	Solucions polimèriques
dc.subject	Ciència dels materials
dc.title	Dynamic covalent urea bonds and their potential for development of self-healing polymer materials
dc.type	journal article	es_ES
dc.date.updated	2019-09-20T13:33:43Z
dc.identifier.doi	10.1039/C9TA02054C
dc.identifier.idgrec	134243
dc.rights.accessRights	open access	es_ES