Preparation method and application of bionic gecko extremely progressive rigid-flexible gradient micro-column structure

Abstract

The invention belongs to the technical field of biomimetic materials, and particularly relates to a preparation method and application of a bionic gecko extremely progressive rigid-flexible gradient micro-column structure. According to the preparation method disclosed by the invention, a self-floating photoinitiator technology and gradient distribution of magnetic enhanced particles driven by a magnetic field are utilized, so that the preparation of a micro-column structure with an extreme mechanical gradient (the local elastic modulus is changed by more than three orders of magnitudes: (10MPa-10GPa) can be realized; meanwhile, one end of the micro-column array is a pure matrix, the other end of the micro-column array is highly mixed and filled with particles of different sizes, the middleof the micro-column array is gradually distributed according to particle sizes and concentration levels, the progressive gradient structure solves the problems of interface compatibility and matchingof rigid and flexible materials in the combining process, and the maximum length-diameter ratio of the composite micro-column with the stable structure is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of bionic materials, and in particular relates to a preparation method and application of a bionic gecko extremely progressive rigid-flexible gradient micro-column structure. Background technique [0002] At the beginning of this century, the mechanism of gecko adhesion and the development of imitation gecko adhesion materials have developed into a multidisciplinary research hotspot in academia. The adhesion of the gecko comes from the special multi-level micro-nano bristle array structure on the sole of the gecko, which can promote the formation of a good shape fusion between the sole of the gecko and the complex surface of nature, thereby maximizing the actual contact area and the molecular force between the contact surfaces. Based on this structure-dominated adhesion mechanism, processing artificial materials (such as polymers) into micro-nano columnar array structures has become a general strategy for th...

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Problems solved by technology

[0007] 1) The preparation process of the geometric composite multi-level structure is complicated, the cost is high, and the interface between the layers is not easy to control, and the synergistic modification effect is not good;

[0008] 2) The cost of the metal-reinforced polymer composite microcolumn structure is too high, and the interface compatibility between the metal coating and the polymer microcolumn is poor;

[0009] 3) The soft / hard polymer composite micro-column structure faces the contradiction of material selection. If the material with the same stiffness difference is not enough to achieve the composite effect, and the stiffness difference is too large, it will cause high mismatch at the bonding interface under the action of external load. Stress, which in turn negatively affects the cyclic load-carrying and durable adhesion capabilities of the structure;

[0010] 4) However, the degree of gradient of the composite micropillars prepared simply by adjusting the spatial distribution of magnetic nano-reinforced particles in the polymer matrix by an external magnetic field is far from the required value, and the gradient also limits the aspect ratio of the structurally stable composite micropillars.

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