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CN-121975151-A - Multi-responsive hydrogel with structural color and preparation method thereof

CN121975151ACN 121975151 ACN121975151 ACN 121975151ACN-121975151-A

Abstract

The application discloses a multi-response hydrogel with structural color and a preparation method thereof, wherein the preparation method comprises the following steps of (1) uniformly mixing a nanogel photonic crystal, a hydrophilic monomer, polyethylene glycol diacrylate, carbon black and a photoinitiator to obtain a gel precursor, (2) placing the gel precursor in a light-resistant environment, placing the gel precursor in a mild disturbance state for at least 24 hours, (3) placing a product of the step (2) at 1-8 ℃ for 1-2 hours, and (4) placing the product of the step (3) on ice for photo-curing to obtain the multi-response hydrogel with structural color. The multi-response hydrogel with structural color prepared by the application has rich and bright colors while considering mechanical properties of materials, and has multiple responses of temperature and strain, thereby having application potential in the fields of flexible sensors, intelligent display and soft robots.

Inventors

  • HOU LEI
  • Miao Zhiyou
  • WU PEIYI

Assignees

  • 东华大学

Dates

Publication Date
20260505
Application Date
20260310

Claims (10)

  1. 1. A method for preparing a multi-responsive hydrogel with structural color, comprising the steps of: (1) Uniformly mixing the nanogel photonic crystal, the hydrophilic monomer, the polyethylene glycol diacrylate, the carbon black and the photoinitiator to obtain a gel precursor; (2) Placing the gel precursor in a light-shielding environment, and placing for at least 24 hours under a mild disturbance state; (3) Standing the product obtained in the step (2) for 1-2 hours at the temperature of 1-8 ℃; (4) And (3) placing the product obtained in the step (3) on ice for photo-curing to obtain the multi-responsive hydrogel with structural color.
  2. 2. The method for preparing a multi-responsive hydrogel with structural color according to claim 1, wherein the method for preparing the nanogel photonic crystal comprises: Uniformly mixing N-isopropyl acrylamide, N' -methylene bisacrylamide, an anionic surfactant and water to obtain a mixed solution; And adding potassium persulfate into the mixed solution under the nitrogen atmosphere for polymerization reaction at 60-80 ℃ for 0.5-1 hour, adding N-phenyl maleamic acid for continuous polymerization reaction at 60-80 ℃ for 2-4 hours, dialyzing, adding an anionic surfactant, and concentrating to obtain the nanogel photonic crystal.
  3. 3. The method for preparing the multi-responsive hydrogel with the structural color according to claim 2, wherein the anionic surfactant is one of sodium dodecyl sulfate and sodium laureth sulfate, and the mass fraction of the anionic surfactant added after dialysis in the gel precursor is 0.2% -1%.
  4. 4. The method for preparing the multi-responsive hydrogel with structural color according to claim 1, wherein the mass fraction of the nanogel photonic crystal in the gel precursor is 3% -7%.
  5. 5. The method for preparing the multi-responsive hydrogel with structural color according to claim 1, wherein the hydrophilic monomer is one of acrylamide, N-hydroxyethyl acrylamide and N-methylol acrylamide, and the mass fraction of the hydrophilic monomer in the gel precursor is 10% -20%.
  6. 6. The method for preparing the multi-responsive hydrogel with structural color according to claim 1, wherein the number of moles of the polyethylene glycol diacrylate is n1, the number of moles of the hydrophilic monomer is n2, and the value range of n1/n2 is 0.03% -0.14%.
  7. 7. The method for preparing the multi-responsive hydrogel with structural color according to claim 1, wherein the mass fraction of carbon black in the gel precursor is 0.005-0.015 wt%.
  8. 8. The method for preparing the multi-responsive hydrogel with structural color according to claim 1, wherein the mild agitation is realized by using a circumferential shaking table or a reciprocating shaking table, the rotation speed of the circumferential shaking table is 200-800 rpm, the stroke of the reciprocating shaking table is 5-30 mm, and the reciprocating frequency is 50-300 rpm.
  9. 9. The multi-responsive hydrogel with structural color, which is characterized in that the multi-responsive hydrogel with structural color is prepared by the preparation method of the multi-responsive hydrogel with structural color as claimed in any one of claims 1-8, the breaking strength of the multi-responsive hydrogel with structural color is 50-80 kpa, and the breaking strain of the multi-responsive hydrogel with structural color is 100% -2500%.
  10. 10. The structurally colored, multi-responsive hydrogel according to claim 9, wherein the structurally colored, multi-responsive hydrogel transitions from a colorless state to a colored state upon warming from 0 ℃ to 30 ℃.

Description

Multi-responsive hydrogel with structural color and preparation method thereof Technical Field The application relates to the technical field of functional materials, in particular to a multi-responsive hydrogel with structural color and a preparation method thereof. Background At present, the responsive hydrogel is used as a polymer material with flexibility and biocompatibility, and has wide application prospects in the fields of flexible sensing, intelligent display, wearable devices, medical instruments, drug controlled release, soft robots and the like. However, the existing traditional hydrogel is mostly colorless or semitransparent, lacks visual and identifiable color change, and is difficult to realize visualization and real-time feedback of external stimulus, and the defect limits further application of the hydrogel in intelligent perception and visualization devices. In order to overcome the problems, researchers introduce photochromic molecules or dyes to carry out color-imparting treatment on the hydrogel, and although color response is realized to a certain extent, the methods generally depend on doping of organic dyes or functional molecules, molecular migration and fading phenomena are easy to occur in the use process, and even environmental pollution is likely to be caused, and meanwhile, the introduction of the dyes often weakens the mechanical properties of the hydrogel, so that the long-term stable service of the material is not facilitated. The photonic crystal material generates structural color by virtue of selective reflection of light of the internal periodic ordered structure, has the remarkable advantages of no need of dye, stable color, high saturation, difficult fading and the like, and is considered as an ideal way for realizing the visual response of the hydrogel. However, the existing photonic crystal hydrogel system has the common problem of insufficient mechanical properties that the network structure is relatively fragile, the structure is easy to break in the stretching, bending or repeated deformation process, and further the structural color is attenuated or even vanished, meanwhile, the photonic crystal structure in part of the system is not firmly combined with the hydrogel matrix, and the toughness of the material is difficult to be considered while the structural color with high saturation is maintained, so that the practical application of the photonic crystal hydrogel system in the flexible device and the wearable field is severely restricted. In addition, temperature-sensitive hydrogels often undergo a significant volume phase change near a Low Critical Solution Temperature (LCST) or a high critical solution temperature (UCST), which gives a material a response capability to temperature stimulus, but existing temperature-sensitive photonic crystal hydrogel systems still have a number of drawbacks, for example, a limited phase change temperature regulation range, easy attenuation of structural color and mechanical properties during temperature cycling, poor response stability and repeatability, and especially under multiple deformation or complex environmental conditions, such materials are difficult to simultaneously maintain high saturation of structural color and excellent mechanical properties. Disclosure of Invention Based on the above, the multi-responsiveness hydrogel with structural color and the preparation method thereof are provided, the preparation process is simple and convenient, the color of the obtained hydrogel is adjustable, the hydrogel has excellent mechanical properties, and the hydrogel can respond to temperature change and different strain proportions and presents different colors. A method for preparing a multi-responsive hydrogel with structural color, comprising the steps of: (1) Uniformly mixing the nanogel photonic crystal, the hydrophilic monomer, the polyethylene glycol diacrylate, the carbon black and the photoinitiator to obtain a gel precursor; (2) Placing the gel precursor in a light-shielding environment, and placing for at least 24 hours under a mild disturbance state; (3) Standing the product obtained in the step (2) for 1-2 hours at the temperature of 1-8 ℃; (4) And (3) placing the product obtained in the step (3) on ice for photo-curing to obtain the multi-responsive hydrogel with structural color. The multi-responsive hydrogel provided by the application has high-saturation structural colors, the structural colors are various colors (such as purple, red and green) in the visible spectrum, and the structural colors can be obtained by adjusting the microsphere size of the nanogel photonic crystal and the concentration of the microsphere size in the gel precursor. The multi-responsive hydrogel provided by the application also has excellent mechanical properties, such as mechanical strength, toughness and cycling stability, and is suitable for the fields with high requirements on the comprehensive performance of materials, such a