Force-induced color-changing material based on photonic crystal structure and preparation method thereof

Abstract

The invention relates to a force-induced color-changing material based on photonic crystals and a preparation method thereof. The force-induced color-changing material comprises a photonic crystal functional layer and an elastic base material layer, and color changes rapidly when the material is stretched or contracted due to external force, so that stress applied to the material and generated strain are visible in real time. A polyacrylate elastomer continuous phase in the photonic crystal functional layer adopts a specific composition, so that the stripping force between the photonic crystal functional layer and the elastic base material layer is improved. The optical performance and the mechanical response color change characteristic of the film can be realized by changing the polymer microsphere structure, and the film has wide application prospects in the fields of product packaging, anti-counterfeiting, sport injury repair, pressure sensors and the like. The photonic crystal structure is obtained through coating and mechanical force regularization arrangement, the process is simple, green and environment-friendly, the preparation cost is low, and continuous and large-scale production can be achieved.

Description

technical field [0001] The invention relates to the field of materials, in particular to a mechanochromic material based on a photonic crystal structure and a preparation method thereof. Background technique [0002] Mechanochromic materials refer to a class of functional materials that change color under the action of external forces. The essence is to affect the microstructure by external forces, such as disturbing electronic energy levels by external forces, inducing phase transitions and defects by external forces, and inducing molecular structures by external forces. Isomerization, etc., change the position and shape of the electronic absorption spectrum of the compound, resulting in a color change. Mechanochromic materials have received more and more attention in recent years because of their application prospects in the fields of stress sensors, memory chips, and anti-counterfeiting. In the field of anti-counterfeiting, the traditional pressure-sensitive ink is a mat...

AI Technical Summary

Problems solved by technology

Although these existing color-changing technologies can change the color of materials under the action of external force, there are still the following problems: 1) due to the fixed color-changing dyes and the small range of color changes, they can only realize the transformation between certain specific colors, and there is a problem The disadvantages of poor responsiveness and insensitivity to discoloration limit its application.

2) Color-changing dyes are usually imidazole derivatives, pyrrole derivatives, dianthrone derivatives, etc. The synthesis process is complicated, the preparation cycle is long, and the product is highly toxic

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