Research On The Preparation And Performance Of Biomimetic Composite Materials Based On Nano-clay

For traditional synthetic materials,a major challenge is to obtain exceptional mechanical properties,especially for an ideal combination of light weight and high strength.In the long-term evolution and selection process,organisms have ingeniously evolved various high-performance biomaterials by using limited elements and compounds.Therefore,people focus on nature and develop a series of bionic materials,such as shells,spider silk,teeth,insect elytra,feathers and so on.As a common biological material,insect elytra have a mechanical property that is light and strong,and exhibits self-healing properties when subjected to external damage,so it has good application prospects in many fields.However,more attention has been paid to the structural of biomaterials,while ignoring their other characteristics,such as self-healing,thermal insulation,and flame retardancy,these properties are no less important than mechanical properties in the construction field.(1)In this paper,biomimetic layered structure materials were prepared by freeze casting using clay particles and polyvinyl alcohol,and the effects of compositions on the mechanical properties of the materials were studied,then the biomimetic layered composites crosslinked with borax were prepared by introducing the self-repairing system of polyvinyl alcohol and borax.(2)Then clay is combined with a synthetic strong adhesion polymer(catechol-grafted polyethyleneimine PEI-C)to prepare biomimetic layered material by freeze casting,and their mechanical properties and adhesion were studied.(3)Finally,in order to simulate the self-healing property of insect and fruits after injury,pyrogallol(PG),protective agent sodium tetraborate and acrylamide were introduced into clay,insect cuticle layered composites by freeze casting and in-situ polymerization,and study its self-healing properties and heat insulation performance.