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Recently, researchers from Nanjing University of Science and Technology and Sichuan University have developed a hard and strong repairable material inspired by dragonfly wings
.
Inspired by the ability of organisms to repair their own structure, performance and specific functions, researchers have developed a series of repairable polymer materials based on supramolecular interactions
.
Since non-covalent interactions can break and bond reversibly at the molecular level, this type of material not only has an unlimited repair capacity in theory, but also repairs the original function
However, the currently reported rigid repairable materials based on supramolecular interactions all show the characteristics of brittle fracture
.
The fracture toughness of this type of material is very low, leading to catastrophic fracture during use, which can lead to serious safety accidents
Dragonfly wings have a unique hierarchical structure ranging from micro-nano scale to macro-scale
.
Studies have confirmed that dragonfly wings are lightweight, and their specific strength and specific stiffness are higher than commercial aviation aluminum alloys
In view of this, the researchers used the idea of fixed structure processing to implant the three-dimensional interconnected dragonfly wing microstructure skeleton into the hard and brittle repairable polymer matrix to solve the problem of brittle fracture of rigid repairable materials
.
Compared with the initial material, the comprehensive mechanical properties of the biomimetic composite material have been significantly improved, with its stiffness increased by 3.
