Method for rapidly preparing photonic crystal hydrogel bilayer film capable of changing color by stretching in large area

Abstract

The invention relates to a method for rapidly preparing photonic crystal hydrogel bilayer film capable of changing the color by stretching in a large area, and belongs to the field of nano-composites. The method comprises steps as follows: acrylamide, a photoinitiator and N, N-methylenebisacrylamide are added to composite microspheres with high concentration of 50 wt%, the composite microspheres are prepared from styrene, methyl methacrylate and acrylic emulsion by polymerization, the materials are evenly mixed, injected into a glass plate and subjected to ultraviolet initiation, and a photonic crystal hydrogel monolayer film is formed; with water taken as a solvent, inorganic nanoparticles as a crosslinking agent, acrylamide and / or acrylic ester as a monomer, a catalyst and / or an initiator are / is added, the materials are evenly mixed and poured into a photonic crystal hydrogel film, and the photonic crystal hydrogel bilayer film capable of changing the color by stretching is formed under the condition of ultraviolet initiation or standing at the room temperature. The bilayer film can change the color by fast stretching, the method is simple, large-area preparation can be realized, and the bilayer film is outstanding in mechanical property, can be used repeatedly and has quite good application prospect in terms of anti-counterfeiting, optical mechanical sensor parts, bionic skin and the like.

Description

technical field [0001] The invention relates to a method for rapidly preparing a stretched color-changing photonic crystal hydrogel double-layer film in a large area, and belongs to the field of nanocomposite materials. Background technique [0002] Due to the periodic ordered structure of photonic crystal hydrogels, which have unique optical properties, they have many applications in optical sensing devices, anti-counterfeiting, camouflage, etc., and have attracted more and more attention from researchers. However, most of the current research is limited to the stimulus response to temperature, pH, solvent, etc., and the color change caused by the load force change is rarely reported, which reduces the application of photonic crystal hydrogels in mechanical sensors. The reported methods of mechanical force response are mainly based on isotropic colloidal crystal arrays, but there are some problems: either it is not recoverable, or it cannot be prepared in a large area, or t...

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Problems solved by technology

However, most of the current research is limited to the stimulus response to temperature, pH, solvent, etc., and the color change caused by the change of load force is rarely reported, which reduces the application of photonic crystal hydrogel in mechanical sensors.

The reported methods of mechanical force response are mainly based on isotropic colloidal crystal arrays, but there are some problems: either it is not recoverable, or it cannot be prepared in a large area, or the preparation method is long and cumbersome, or the adjustable wavelength is relatively slow. Narrow, small range of variation, which limits its application

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