Ju H, Zhu QL, Zuo M, Liang S, Du M, Zheng Q, Wu ZL. Toughening Hydrogels by forming Robust Hydrazide-transition Metal Coordination Complexes.
Chemistry 2023:e202300969. [PMID:
37098764 DOI:
10.1002/chem.202300969]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/23/2023] [Accepted: 04/26/2023] [Indexed: 04/27/2023]
Abstract
Energy dissipation based on dynamic fracture of metal ligands is one of effective means to toughen hydrogel materials for specific applications in biomedical and engineering fields. Exploration of new kinds of metal-ligand coordinates with robust bonding strength is crucial for the facile synthesis of tough gels. Reported here is a hydrogel toughening strategy based on the formation of robust coordination complexes between the hydrazide ligands and zinc ions. The resultant hydrogels exhibit high strength and toughness at room temperature. Their mechanical properties show temperature dependence due to the dynamic nature of coordination bonds. In addition, the amine group of hydrazides in the gel matrix provides reactive site for Schiff's base reaction, enabling surface modification without influence on overall mechanical performances of the gel. The hydrazide ligands are easy-synthesis and can form robust coordination with several transition metals. Such metal-ligand coordinates should be suitable to other systems to develop tough soft materials with versatile applications.
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