A method for preparing stable polymer-colloidal composite photonic crystals using cross-linkable polymers

Abstract

The present application relates to a kind of method for preparing stable polymer-colloid composite photonic crystal using crosslinkable polymer, belong to ordered polymer-based composite material field.By the compound containing double bond and high molecular weight polymer are reacted under certain conditions, obtain the polymer of modified double bond group.Single dispersion colloidal particle dispersion liquid and above-mentioned polymer of modified double bond group are compounded by, and the compound is oscillation shearing to obtain the composite film with bright structural color, and crosslinking is realized by the polymerization of double bond group, to obtain the polymer-colloid composite film with stable structure.The present application utilizes supramolecular dynamic reversible interaction to obtain the polymer-colloid composite photonic crystal with bright structural color, crosslinkable.By crosslinking, the polymer-colloid composite photonic crystal with stable structure is obtained.The present application is simple in operation, low in cost, with the potential of large-scale industrial production, and shows good application prospect in display, sensing and anti-counterfeiting field.

Description

Technical Field

[0001] This invention belongs to the field of ordered polymer composite materials, and more specifically, relates to a method for preparing stable polymer-colloidal composite photonic crystals using crosslinkable polymers. Background Technology

[0002] The interaction between visible light and periodic micro- and nanostructures can produce structural colors. Compared with pigment colors produced by selective absorption, structural colors have advantages such as low energy consumption, no pollution, resistance to fading, and easy adjustment. They have received widespread attention in the fields of color coatings, visual sensing, and anti-counterfeiting.

[0003] Due to the needs of production and daily life, people have developed various brightly colored and functional structural color materials. Patent application TW101144991 first obtains a colloidal microsphere array arranged in a periodic structure through the self-assembly of colloidal particles, then infiltrates a liquid translucent material, and after curing, obtains a photonic color-changing film with structural color. However, this method, which relies on assembling a colloidal template before fixing, is cumbersome, has a small sample area, and is not conducive to large-scale production of structural color films. Chinese invention patent application CN202011123823.5 solves the problem of large-scale preparation of structural color films, providing a new approach for the large-scale preparation of responsive structural color films. This is of great significance to the development of structural color materials. Currently, the application of this method is still relatively limited, and it can only be achieved by synthesizing colloidal particles with certain viscosity and specific core-shell structures. Chinese invention patent application CN202211347861.8 selects common colloidal particles and polymers, and utilizes the unique processing properties of supramolecular polymers to rapidly and scalably prepare structural color composite films through oscillation and shearing. However, due to the reversible dynamic interactions of supramolecular structures, the structural color of shear-induced photonic crystals is unstable. Temperature and humidity can disrupt the long-range ordered structure of colloidal particles, thus affecting the chemical stability of polymer composite photonic crystals. Therefore, constructing highly stable supramolecular composite systems is crucial. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a method for preparing stable polymer-colloid composite photonic crystals using crosslinkable polymers. This method involves modifying small molecule compounds onto polymer chains to obtain polymers containing double bond groups. After compositing with colloidal particles, a stable polymer-colloid composite film is obtained through crosslinking using an oscillatory shearing technique. This solves the problem of unstable chemical structure in structural color composite films prepared by existing methods.

[0005] To achieve the above objectives, according to one aspect of the present invention, a method for preparing a stable polymer-colloid composite photonic crystal is provided, comprising the following steps:

[0006] (1) The polymer is reacted with a compound containing carbon-carbon double bonds, wherein the polymer contains at least one of amino, hydroxyl, and halogen atoms, and the compound contains at least one of acid anhydride reactive groups, epoxy reactive groups, acyl chloride reactive groups, and carboxylic acid reactive groups to obtain a polymer modified with carbon-carbon double bonds; the colloidal particles are dispersed in a solvent to obtain a monodisperse colloidal particle dispersion.

[0007] (2) The monodisperse colloidal particle dispersion obtained in step (1) is mixed with the carbon-carbon double bond modified polymer, and then an initiator is added. The supramolecular polymer-colloidal complex is obtained by solvent evaporation.

[0008] (3) The supramolecular polymer-colloid composite obtained in step (2) is subjected to oscillation and shearing to arrange the colloidal particles in the composite into an ordered structure, thereby obtaining a supramolecular polymer-colloid composite photonic crystal with a bright structural color.

[0009] (4) The supramolecular polymer-colloidal composite photonic crystal with bright structural color obtained in step (3) is cross-linked and cured by light irradiation or heating to obtain a stable polymer-colloidal composite photonic crystal with bright structural color.

[0010] Preferably, the colloidal particle size is 150-250 nm; the colloidal particle is at least one of silica colloidal particles, polystyrene colloidal particles, iron oxide colloidal particles, metal-organic framework colloidal particles, cellulose nanocrystals, zinc sulfide colloidal particles, and cadmium sulfide colloidal particles; the colloidal particle surface has hydroxyl, amino, or carboxyl functional groups.

[0011] Preferably, the polymer is at least one of polydimethylsiloxane polymers, acrylate polymers, polyethylene glycol derivative polymers, polyethyleneimine polymers, and polyurethane polymers; the polymer has a molecular weight greater than 2000.

[0012] Preferably, the mass concentration of the monodisperse colloidal particle dispersion is 5%-20%; the volume ratio of the polymer to the colloidal particle dispersion is (42-150):100.

[0013] Preferably, the initiator is a thermal initiator or a photoinitiator.

[0014] Preferably, the thermal initiator is at least one of benzoyl peroxide, dicumyl peroxide, azobisisobutyronitrile, azodicarbonamide, and azobisisobutyranin hydrochloride; and the photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-dimethylamino-2-benzyl-1-[4-(4-morpholino)phenyl]-1-butanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, and methyl benzoylformate.

[0015] Preferably, the temperature of the oscillating shear is 25℃-40℃; the shear strain is 50%-1000%; and the number of shearing cycles is 10-1000.

[0016] Preferably, in step (1), the solvent is at least one of water, tetrahydrofuran, N,N-dimethylformamide, n-hexane, cyclohexane, methanol, ethanol, isopropanol, dimethyl sulfoxide, N,N-dimethylacetamide, chloroform, dichloromethane, acetone, and ethyl acetate.

[0017] According to another aspect of the present invention, a stable polymer-colloidal composite photonic crystal prepared by any one of the methods is provided.

[0018] According to another aspect of the present invention, the application of the aforementioned stable polymer-colloid composite photonic crystal in display, sensing, or anti-counterfeiting is provided.

[0019] In summary, compared with the prior art, the above-described technical solutions conceived by this invention mainly possess the following technical advantages:

[0020] (1) The reaction synthesis of this invention is simple and the reaction conditions are mild. A polymer with double bond groups modified on the polymer chain can be obtained through a one-step reaction. The product after the reaction does not require post-processing and can be stored for a long time. The polymer after the reaction has small intermolecular forces and good molecular chain flexibility, which can form weak bond interactions with colloidal particles. At the same time, it has unsaturated carbon-carbon double bonds on the polymer chain. On the one hand, the weak bond interactions can ensure that the polymer can flow during the oscillatory shearing process, and at the same time, there is enough force between the polymer and colloidal particles to drive the colloidal particles to arrange in an orderly manner. On the other hand, after the colloidal particles are arranged in an orderly manner, cross-linking can cause the carbon-carbon double bonds to polymerize and form strong covalent bonds, which fixes the ordered structure of the colloidal particles and allows the structural color of the supramolecular polymer-colloidal composite photonic crystal to exist stably.

[0021] (2) The polymers and compounds used in this invention are widely available. Based on the physical properties of polymers, supramolecular polymer-colloidal composite photonic crystals can be used to achieve specific functionalities, such as the introduction of conductive polymers, enabling the structural color composite film to achieve coordinated output of optical and electrical signals under stress.

[0022] (3) The present invention provides a simple and easily scaled-up method for obtaining structurally colored composite films. By directly combining high-molecular-weight polymers containing double bonds with colloidal particles, and utilizing the reversible dynamic interactions of supramolecular particles, the present invention enables the rapid and large-area preparation of supramolecular polymer-colloidal composite photonic crystals with structural colors using oscillatory shearing techniques. The present invention allows for the flexible adjustment of the size and content of colloidal particles to obtain supramolecular polymer-colloidal composite photonic crystal films with different structural colors.

[0023] (4) This invention constructs a supramolecular polymer-colloidal composite photonic crystal film with a stable colloidal particle structure by modifying double bonds on the polymer chain. Compared with the composite film without modified double bonds, the supramolecular polymer-colloidal composite photonic crystal film of this invention exhibits greatly improved mechanical properties, swelling cycle properties, and folding cycle properties after crosslinking, making it suitable for a wider range of applications. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the preparation and structure of the polymer-colloid composite photonic crystal described in this invention.

[0025] Figure 2 The tensile cycle stability and swelling cycle stability of the polymer-colloid composite photonic crystal in Example 1 are shown.

[0026] Figure 3 The polymer-colloid composite photonic crystal in Example 1 is folded and cycle-stable.

[0027] Figure 4 Optical photographs and corresponding reflection spectra of the polymer-colloid composite photonic crystal in Examples 2-4.

[0028] Figure 5 These are electron microscope images and optical images of the polymer-colloid composite photonic crystals in Examples 5-7.

[0029] Figure 6 The stress-strain curves are for the polymer-colloid composite photonic crystals in Examples 8-10.

[0030] Figure 7 The image shows an optical photograph and the corresponding reflection spectrum of the polymer-colloid composite photonic crystal in Example 11. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Example 1

[0033] Figure 1 This is a schematic diagram illustrating the preparation and structure of the polymer-colloidal composite photonic crystal of the present invention. The present invention provides a method for preparing a stable polymer-colloidal composite photonic crystal using a crosslinkable polymer, comprising the following steps: First, polyethyleneimine and glycidyl methacrylate with a molecular weight of 10K are separately dispersed in ethanol to prepare a dispersion with a mass fraction of 20%. The polyethyleneimine dispersion and the glycidyl methacrylate dispersion are added to a reaction vessel at a mass ratio of 15:1, and reacted at 15°C for 5.5 h to obtain a polyethyleneimine-glycidyl methacrylate dispersion.

[0034] (1) Silica with a size of 170 nm was dispersed in ethanol. The polyethyleneimine-glycidyl methacrylate dispersion obtained in step (1) was mixed with the silica dispersion to form a precursor dispersion, wherein the volume fraction of silica colloid particles was 50%, and the content of the initiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone was 0.15% of the mass of polyethyleneimine-glycidyl methacrylate. Then the precursor solution was placed on a heating table at 40°C, and the ethanol was evaporated under the action of magnetic stirring to obtain a supramolecular polymer-colloid composite slurry, wherein the solvent content was controlled at 20%.

[0035] (2) The supramolecular polymer-colloid composite slurry obtained in step (1) is placed between two PET films. The composite is pressed into a film using a flatbed hot press at 25°C and 5MPa. The film is then sheared along a fixed rod 30 times at 25°C to arrange the colloidal particles in the composite in an orderly manner, thereby producing a crosslinkable supramolecular polymer-colloid composite photonic crystal.

[0036] (3) The supramolecular polymer-colloidal composite photonic crystal in step (2) is photocured under ultraviolet light for 10 min to fix the arrangement structure of colloidal particles and produce a polymer-colloidal composite photonic crystal with a stable structure.

[0037] like Figure 2 , Figure 3 As shown, its mechanical cycle performance, folding cycle performance, and swelling cycle performance all exhibit good stability.

[0038] Examples 2-4

[0039] A method for preparing stable polymer-colloid composite photonic crystals using crosslinkable polymers includes the following steps:

[0040] (1) First, polyethyleneimine with a molecular weight of 10K and glycidyl methacrylate were dispersed in ethanol to prepare a dispersion with a mass fraction of 20%. The dispersion of polyethyleneimine and the dispersion of glycidyl methacrylate were added to a reaction vessel at a mass ratio of 15:1 and reacted at 15°C for 5.5 h to obtain a polyethyleneimine-glycidyl methacrylate dispersion.

[0041] (2) 186 nm silica particles were dispersed in ethanol. The polyethyleneimine-glycidyl methacrylate dispersion obtained in step (1) was mixed with the silica dispersion to form a precursor dispersion, wherein the volume fraction of silica particles was 40%, 50%, and 60%, and the content of the initiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone was 0.15% of the mass of polyethyleneimine-glycidyl methacrylate. The precursor solution was then placed on a heating table at 40 °C, and the ethanol was evaporated under magnetic stirring to obtain a supramolecular polymer-colloidal composite slurry, wherein the solvent content was controlled at 20%.

[0042] (3) The supramolecular polymer-colloid composite slurry obtained in step (2) is placed between two PET films. The composite is pressed into a film using a flatbed hot press at 25°C and 5MPa. The film is then sheared along a fixed rod 50 times at 25°C to arrange the colloidal particles in the composite in an orderly manner, thereby obtaining a crosslinkable supramolecular polymer-colloid composite photonic crystal.

[0043] (4) The supramolecular polymer-colloid composite photonic crystal in step (3) is photocured under ultraviolet light for 10 min to fix the arrangement structure of colloidal particles and obtain a polymer-colloid composite film with a stable structure.

[0044] like Figure 4 The image shows optical photographs and corresponding reflection spectra of polymer-colloidal composite photonic crystals prepared with silica gel particles at volume fractions of 40%, 50%, and 60%.

[0045] Examples 5-7

[0046] A method for preparing stable polymer-colloid composite photonic crystals using crosslinkable polymers includes the following steps:

[0047] (1) First, polyethyleneimine with a molecular weight of 10K and glycidyl methacrylate were dispersed in ethanol to prepare a dispersion with a mass fraction of 20%. The dispersion of polyethyleneimine and the dispersion of glycidyl methacrylate were added to a reaction vessel at a mass ratio of 15:1 and reacted at 15°C for 5.5 h to obtain a polyethyleneimine-glycidyl methacrylate dispersion.

[0048] (2) Silica particles with sizes of 140 nm, 171 nm, and 200 nm were dispersed in ethanol. The polyethyleneimine-glycidyl methacrylate dispersion obtained in step (1) was mixed with the silica dispersion to form a precursor dispersion, wherein the volume ratio of polyethyleneimine-glycidyl methacrylate to silica colloid particles was 1:1. The content of the initiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone was 0.15% of the mass of polyethyleneimine-glycidyl methacrylate. Then, the precursor solution was placed on a heating table at 40°C, and the ethanol was evaporated under magnetic stirring to obtain a supramolecular polymer-colloid composite slurry, wherein the solvent content was controlled at 20%.

[0049] (3) The supramolecular polymer-colloid composite slurry obtained in step (2) is placed between two PET films. The composite is pressed into a film using a flatbed hot press at 25°C and 5MPa. The film is then sheared along a fixed rod 50 times at 25°C to arrange the colloidal particles in the composite in an orderly manner, thereby obtaining a crosslinkable supramolecular polymer-colloid composite photonic crystal.

[0050] (4) The supramolecular polymer-colloid composite photonic crystal in step (3) is photocured under ultraviolet light for 10 min to fix the arrangement structure of colloidal particles and obtain a polymer-colloid composite film with a stable structure.

[0051] like Figure 5 The images shown are optical photographs and corresponding electron microscope images of polymer-colloidal composite photonic crystals prepared when the silica gel particles have sizes of 140 nm, 171 nm, and 200 nm.

[0052] Examples 8-10

[0053] A method for preparing stable polymer-colloid composite photonic crystals using crosslinkable polymers includes the following steps:

[0054] (1) First, polyethyleneimine with a molecular weight of 10K and glycidyl methacrylate were dispersed in ethanol to prepare a dispersion with a mass fraction of 20%. The dispersions of polyethyleneimine and glycidyl methacrylate were added to a reaction vessel at a mass ratio of 10:1, 15:1, and 20:1, and reacted at 15°C for 5.5 h to obtain a polyethyleneimine-glycidyl methacrylate dispersion.

[0055] (2) 180 nm silica particles were dispersed in ethanol. The polyethyleneimine-glycidyl methacrylate dispersion obtained in step (1) was mixed with the silica dispersion to form a precursor dispersion, wherein the volume ratio of polyethyleneimine-glycidyl methacrylate to silica particles was 1:1. The content of the initiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone was 0.15% of the mass of polyethyleneimine-glycidyl methacrylate. The precursor solution was then placed on a heating table at 40 °C, and the ethanol was evaporated under magnetic stirring to obtain a supramolecular polymer-colloidal composite slurry, wherein the solvent content was controlled at 20%.

[0056] (3) The supramolecular polymer-colloid composite slurry obtained in step (2) is placed between two PET films. The composite is pressed into a film using a flatbed hot press at 25°C and 5MPa. The film is then sheared along a fixed rod 50 times at 25°C to arrange the colloidal particles in the composite in an orderly manner, thereby obtaining a crosslinkable supramolecular polymer-colloid composite photonic crystal.

[0057] (4) The polymer-colloid composite film in step (3) is photocured under ultraviolet light for 10 min to fix the arrangement structure of the colloidal particles and obtain a supramolecular polymer-colloid composite photonic crystal with a stable structure.

[0058] like Figure 6 The figure shows the stress-strain curves of polymer-colloidal composite photonic crystals prepared when the mass ratio of polyethyleneimine dispersion to glycidyl methacrylate dispersion is 10:1, 15:1, and 20:1.

[0059] Example 11

[0060] A method for preparing stable polymer-colloid composite photonic crystals using crosslinkable polymers includes the following steps:

[0061] (1) First, polyethyleneimine with a molecular weight of 10K and methacrylic anhydride were dispersed in ethanol to prepare a dispersion with a mass fraction of 20%. The dispersion of polyethyleneimine and the dispersion of glycidyl methacrylate were added to a reaction vessel at a mass ratio of 15:1 and reacted at 50°C for 3 hours to obtain a polyethyleneimine-methacrylic anhydride dispersion.

[0062] (2) Silica particles with a size of 176 nm were dispersed in ethanol. The polyethyleneimine-methacrylic anhydride dispersion obtained in step (1) was mixed with the silica dispersion to form a precursor dispersion, wherein the volume ratio of polyethyleneimine-methacrylic anhydride to silica colloid particles was 1:1. The content of the initiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone was 0.15% of the mass of polyethyleneimine-methacrylic anhydride. Then the precursor solution was placed on a heating table at 40°C, and the ethanol was evaporated under the action of magnetic stirring to obtain a supramolecular polymer-colloid composite slurry, wherein the solvent content was controlled at 20%.

[0063] (3) The supramolecular polymer-colloid composite slurry obtained in step (2) is placed between two PET films. The composite is pressed into a film using a flatbed hot press at 25°C and 5MPa. The film is then sheared along a fixed rod 50 times at 25°C to arrange the colloidal particles in the composite in an orderly manner, thereby obtaining a crosslinkable supramolecular polymer-colloid composite photonic crystal.

[0064] (4) The polymer-colloid composite film in step (3) is photocured under ultraviolet light for 10 min to fix the arrangement structure of the colloidal particles and obtain a supramolecular polymer-colloid composite photonic crystal with a stable structure.

[0065] like Figure 7 The image shows an optical photograph and the corresponding reflection spectrum of a polymer-colloidal composite photonic crystal prepared from a composite of polyethyleneimine and methacrylic anhydride with silica.

[0066] Example 12

[0067] A method for preparing stable polymer-colloid composite photonic crystals using crosslinkable polymers includes the following steps:

[0068] (1) First, polyethylene glycol-polypropylene glycol-polyethylene glycol block copolymer with a molecular weight of 10K and methacrylic anhydride were dispersed in ethanol to prepare a dispersion with a mass fraction of 20%. The dispersion of polyethyleneimine and the dispersion of glycidyl methacrylate were added to a reaction vessel at a mass ratio of 15:1 and reacted at 50°C for 3 hours to obtain a polyethylene glycol-polypropylene glycol-polyethylene glycol-methacrylic anhydride dispersion.

[0069] (2) 186 nm silica particles were dispersed in ethanol. The polyethylene glycol-polypropylene glycol-polyethylene glycol-methacrylic anhydride dispersion obtained in step (1) was mixed with the silica dispersion to form a precursor dispersion, wherein the volume ratio of polyethyleneimine-methacrylic anhydride to silica colloid particles was 1:1. The content of the initiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone was 0.15% of the mass of polyethyleneimine-methacrylic anhydride. Then the precursor solution was placed on a heating table at 40 °C, and the ethanol was evaporated under the action of magnetic stirring to obtain a supramolecular polymer-colloid composite slurry, wherein the solvent content was controlled at 20%.

[0070] (3) The supramolecular polymer-colloid composite slurry obtained in step (2) is placed between two PET films. The composite is pressed into a film using a flatbed hot press at 25°C and 5MPa. The film is then sheared along a fixed rod 50 times at 25°C to arrange the colloidal particles in the composite in an orderly manner, thereby obtaining a crosslinkable supramolecular polymer-colloid composite photonic crystal.

[0071] (4) The supramolecular polymer-colloidal composite photonic crystal in step (3) is photocured under ultraviolet light for 10 min to fix the arrangement structure of the colloidal particles and obtain a supramolecular polymer-colloidal composite photonic crystal with a stable structure.

[0072] Example 13

[0073] A method for preparing stable polymer-colloid composite photonic crystals using crosslinkable polymers includes the following steps:

[0074] (1) First, polyethyleneimine with a molecular weight of 10K and glycidyl methacrylate were dispersed in ethanol to prepare a dispersion with a mass fraction of 20%. The dispersion of polyethyleneimine and the dispersion of glycidyl methacrylate were added to a reaction vessel at a mass ratio of 15:1 and reacted at 15°C for 5.5 h to obtain a polyethyleneimine-glycidyl methacrylate dispersion.

[0075] (2) Poly(styrene-co-acrylic acid) with a size of 210 nm was dispersed in ethanol. The polyethyleneimine-glycidyl methacrylate dispersion obtained in step (1) was mixed with the poly(styrene-co-acrylic acid) dispersion to form a precursor dispersion, wherein the volume ratio of polyethyleneimine-glycidyl methacrylate to silica gel particles was 1:1. The content of the initiator 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone was 0.15% of the mass of polyethyleneimine-glycidyl methacrylate. Then the precursor solution was placed on a heating table at 40°C, and the ethanol was evaporated under the action of magnetic stirring to obtain a supramolecular polymer-colloidal composite slurry, wherein the solvent content was controlled at 20%.

[0076] (3) The supramolecular polymer-colloid composite slurry obtained in step (2) is placed between two PET films. The composite is pressed into a film using a flatbed hot press at 25°C and 5MPa. The film is then sheared along a fixed rod 30 times at 25°C to arrange the colloidal particles in the composite in an orderly manner, thereby obtaining a crosslinkable supramolecular polymer-colloid composite photonic crystal.

[0077] (4) The supramolecular polymer-colloidal composite photonic crystal in step (3) is photocured under ultraviolet light for 10 min to fix the arrangement structure of the colloidal particles and obtain a supramolecular polymer-colloidal composite photonic crystal with a stable structure.

[0078] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for preparing a stable polymer-colloid composite photonic crystal, characterized in that, Includes the following steps: (1) The polymer is reacted with a compound containing carbon-carbon double bonds, wherein the polymer contains at least one of amino, hydroxyl, and halogen atoms, and the compound contains at least one of acid anhydride reactive groups, epoxy reactive groups, acyl chloride reactive groups, and carboxylic acid reactive groups to obtain a polymer modified with carbon-carbon double bonds; the colloidal particles are dispersed in a solvent to obtain a monodisperse colloidal particle dispersion. (2) The monodisperse colloidal particle dispersion obtained in step (1) is mixed with the carbon-carbon double bond modified polymer, and then an initiator is added. The supramolecular polymer-colloidal complex is obtained by solvent evaporation. (3) The supramolecular polymer-colloid composite obtained in step (2) is subjected to oscillation and shearing to arrange the colloidal particles in the composite into an ordered structure, thereby obtaining a supramolecular polymer-colloid composite photonic crystal with a bright structural color. (4) The supramolecular polymer-colloidal composite photonic crystal with bright structural color obtained in step (3) is cross-linked and cured by light irradiation or heating to obtain a stable polymer-colloidal composite photonic crystal with bright structural color.

2. The method for preparing a stable polymer-colloid composite photonic crystal as described in claim 1, characterized in that, The colloidal particles have a size of 150-250 nm; the colloidal particles are at least one of silica colloidal particles, polystyrene colloidal particles, iron oxide colloidal particles, metal-organic framework colloidal particles, cellulose nanocrystals, zinc sulfide colloidal particles, and cadmium sulfide colloidal particles; the surface of the colloidal particles has hydroxyl, amino, or carboxyl functional groups.

3. The method for preparing a stable polymer-colloid composite photonic crystal as described in claim 1, characterized in that, The polymer is at least one of polydimethylsiloxane polymers, acrylate polymers, polyethylene glycol derivative polymers, polyethyleneimine polymers, and polyurethane polymers; the polymer has a molecular weight greater than 2000.

4. The method for preparing a stable polymer-colloid composite photonic crystal as described in claim 1, characterized in that, The mass concentration of the monodisperse colloidal particle dispersion is 5%-20%; the volume ratio of the polymer to the colloidal particle dispersion is (42-150):

100.

5. The method for preparing a stable polymer-colloid composite photonic crystal as described in claim 1, characterized in that, The initiator is a thermal initiator or a photoinitiator.

6. The method for preparing a stable polymer-colloid composite photonic crystal as described in claim 5, characterized in that, The thermal initiator is at least one of benzoyl peroxide, dicumyl peroxide, azobisisobutyronitrile, azodicarbonamide, and azobisisobutyranin hydrochloride; the photoinitiator is at least one of 2-hydroxy-2-methyl-1-phenylpropanone, 1-hydroxycyclohexylphenyl ketone, 2-dimethylamino-2-benzyl-1-[4-(4-morpholino)phenyl]-1-butanone, 2-hydroxy-2-methyl-1-[4-(2-hydroxyethoxy)phenyl]-1-propanone, and methyl benzoylformate.

7. The method for preparing a stable polymer-colloid composite photonic crystal as described in claim 1, characterized in that, The temperature of the oscillating shear is 25ºC-40ºC; the shear strain is 50%-1000%; and the number of shearing cycles is 10-1000.

8. The method for preparing a stable polymer-colloid composite photonic crystal as described in claim 1, characterized in that, In step (1), the solvent is at least one of water, tetrahydrofuran, N,N-dimethylformamide, n-hexane, cyclohexane, methanol, ethanol, isopropanol, dimethyl sulfoxide, N,N-dimethylacetamide, chloroform, dichloromethane, acetone and ethyl acetate.

9. A stable polymer-colloidal composite photonic crystal prepared by any one of claims 1-8.

10. The application of the stable polymer-colloid composite photonic crystal as described in claim 9 in display, sensing, or anti-counterfeiting applications.

Images