CN111548452A - Preparation method of self-adaptive optical gel based on borate reversible covalent bond - Google Patents

Preparation method of self-adaptive optical gel based on borate reversible covalent bond Download PDF

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CN111548452A
CN111548452A CN202010287450.9A CN202010287450A CN111548452A CN 111548452 A CN111548452 A CN 111548452A CN 202010287450 A CN202010287450 A CN 202010287450A CN 111548452 A CN111548452 A CN 111548452A
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microspheres
optical gel
monodisperse
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余子夷
张静
张晶晶
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Cambridge University Nanjing Science And Technology Innovation Center Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F261/00—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00
    • C08F261/02—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols
    • C08F261/04—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated alcohols on to polymers of vinyl alcohol
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F257/00—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00
    • C08F257/02—Macromolecular compounds obtained by polymerising monomers on to polymers of aromatic monomers as defined in group C08F12/00 on to polymers of styrene or alkyl-substituted styrenes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
    • C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica

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Abstract

A preparation method of optical gel with self-adaptive characteristic comprises the steps of adding a comonomer, a micromolecule functional monomer containing phenylboronic acid functional group, a complementary macromolecule and an initiator into a dispersion liquid of monodisperse microspheres under a specific pH condition, and then carrying out ultraviolet light or thermal polymerization to obtain the optical gel; the pH is between 6 and 10; the types of monodisperse microspheres include: inorganic microspheres, silica microspheres, ferroferric oxide microspheres, titanium dioxide microspheres, and the like; organic microspheres, Polystyrene (PS) microspheres, polymethyl methacrylate (PMMA) microspheres, and the like; hybrid microspheres including core-shell structure microspheres and the like; the size of the monodisperse microsphere is between 80nm and 3 mu m. The particle size of the monodisperse microspheres determines the color exhibited by the optical gel, with smaller particle sizes shifting color in the blue direction and vice versa.

Description

Preparation method of self-adaptive optical gel based on borate reversible covalent bond
Technical Field
The invention relates to a preparation method of an optical functional material, in particular to a preparation method of an optical gel with self-adaptive characteristics.
Background
The structural color or physical color refers to a color that appears by a physical action such as interference, diffraction, or scattering of light with a specific structure of a material itself. Different from chemical colors such as dyes, pigments and the like, the structural color is usually bright in color, long in service life and free of photobleaching, and is widely applied to the fields of anti-counterfeiting, sensing, displaying and the like. The colloidal photonic crystal is a common structural color material and is formed by orderly arranging monodisperse colloidal particles in a self-assembly mode. When the electromagnetic wave is transmitted in the colloidal photonic crystal, a photon forbidden band is formed under the Bragg scattering modulation effect of the colloidal particles; visible light is totally reflected when it has energy within the forbidden band and cannot enter the material, thus displaying a particular color.
The colloidal photonic crystals are usually constructed by a self-assembly strategy of bottom-up. For example, a Colloidal crystal array (crystal Colloidal array) can be constructed based on the strong electrostatic repulsion among Colloidal particles, and the material can present bright structural color in a solution state; adopting colloidal particle dispersion liquid as ink, and constructing a patterned colloidal photonic crystal array by an ink-jet printing mode; the micro-droplets are used as an assembly template, and a series of colloid crystal micro-bead materials which can be applied to the field of optical coding can be prepared. It can be seen that the colloidal photonic crystal structure can be obtained by simply using monodisperse colloidal particles as basic units to carry out self-assembly, and structural color display is realized. However, in practical use, other components such as hydrogel, ceramic, noble metal nanoparticles, etc. are usually introduced into the colloidal photonic crystal structure to form a composite material, in order to improve the mechanical properties of the colloidal photonic crystal material or to impart specific functionality thereto.
The colloid photonic crystal-hydrogel composite material has the structural color characteristics of photonic crystals, the flexibility and the water retention function of hydrogel materials, and has stimulation response to electricity, magnetism, chemistry, heat, mechanics and the like, so the colloid photonic crystal-hydrogel composite material attracts great attention in the fields of sensing, biomedicine, flexible display and the like. Such composites are typically obtained by impregnating a colloidal crystalline material with a small molecule precursor followed by uv or thermal curing for crosslinking. In the prior art, most of the hydrogels are covalent cross-linked three-dimensional network structures, which effectively fix the structure of a colloid assembly, improve the mechanical stability of the composite material, and endow the composite material with special force, heat, magnetic and other response characteristics. Unfortunately, these composites cannot change their appearance once they are photo-cured or thermally cross-linked; furthermore, healing recovery is also not possible when subjected to external forces, which undoubtedly reduces the workability and service life of the material to some extent. Therefore, designing and developing an optical gel composite material with self-adaptive characteristics and self-healing capability is crucial to further widening the application of photonic crystals.
The preparation of self-healing gel materials can be found in the literature (j. zhou, p. han. self-crosslinkable organic nanocomposite with angle-independent structural colors. angel. chem. int. ed.,2017,56, 10462). The self-healing gel material in this document is prepared by the following method:
amino-terminated polydimethylsiloxane (NH)2-PDMS-NH2) And isophorone diisocyanate (IPDI) forms linear high molecular polymer chains through the polymerization reaction of isocyanate and amino, and then the high molecular chains form a block gel with healing capacity through hydrogen bonding. The prior art has the defects that the polymer precursor has higher viscosity and poor fluidity, and needs more organic solvents; and after polymerization, the polymer becomes solid, and cannot flow and be molded.
Document 2 (Bio-anchored self-healing structural color hydrogel, PNAS, 2017,114(23) 5900;) discloses a method of filling the structure of a colloidal crystal with a self-healing hydrogel to form an optical gel of inverse opal structure with structural and self-healing properties.
However, the method of document 2 has a disadvantage that the process is complicated, and a template having a structural color needs to be formed first, and then the template material is filled and then removed; the prepared optical material has the characteristic of color angle dependence. The material prepared in the document 2 has a structural color formed by the crystalline nanostructure.
Disclosure of Invention
The invention aims to provide a preparation method of an optical gel with self-adaptive characteristics, which develops and designs a novel optical gel material with self-adaptive and self-healing capabilities by introducing reversible covalent cross-linking network gel based on a boric acid system into the design of a photonic crystal composite material.
The invention has the technical scheme that the optical gel with the self-adaptive characteristic is prepared by adding a comonomer, a micromolecule functional monomer containing phenylboronic acid functional group, complementary macromolecules (polyvinyl alcohol, glucan or macromolecules containing dopamine side chains) and an initiator into a dispersion liquid of monodisperse microspheres under a certain pH condition, and then carrying out ultraviolet light or thermal polymerization;
the pH is generally between 6 and 10; the types of monodisperse microspheres include: inorganic microspheres such as silica microspheres, ferroferric oxide microspheres, titanium dioxide microspheres, and the like; organic microspheres, such as Polystyrene (PS) microspheres, polymethyl methacrylate (PMMA) microspheres, and the like; hybrid microspheres, such as core-shell structure microspheres and the like; the monodisperse microspheres used herein have a particle size in the range of 80nm to 3 μm;
the mass fraction of the monodisperse colloidal particles in the dispersion is between 0.5% and 70%; the dispersion liquid of the monodisperse microsphere comprises the following components: one or more of water, dimethylacetamide (DMAc), acetone, bromocyclohexane, cis-decalin, pyridine and other solvents;
the comonomer comprises one or more of vinyl monomers such as acrylamide, dimethylacrylamide, isopropylacrylamide, hydroxyethyl methyl acrylate, polyethylene glycol acrylate and the like;
the mass fraction of the comonomer in the dispersion liquid is controlled between 5 and 30 percent; the functional monomer containing the phenyl boronic acid functional group generally refers to 3-acrylamido phenyl boronic acid or other small molecule vinyl monomers (molecular weight less than 20kD) containing the phenyl boronic acid functional group; the dosage of the functional monomer containing the phenylboronic acid functional group accounts for 0.01-10% of the mass fraction of the comonomer; the complementary polymer comprises one or more of polyvinyl alcohol, glucan or a polymer containing a dopamine side chain; the dosage of the complementary polymer accounts for 0.01 to 10 percent of the mass fraction of the comonomer; the initiator is generally referred to as a conventional photoinitiator or thermal initiator, and includes: 2959, KPS, APS, AIBN, etc.
The particle size of the monodisperse microspheres (within the particle size range of the present invention) determines the color exhibited by the optical gel, with smaller particle sizes shifting the color in the blue direction and vice versa in the red direction. The method can directly form the optical gel and has simple steps; based on the analysis, the dynamic covalent crosslinking network gel based on the boric acid system is introduced into the design of the photonic crystal composite material for the first time.
Has the advantages that: according to the invention, the reversible covalent crosslinking network gel based on the borate is introduced into the design of the photonic crystal composite material, so that the novel optical gel material with self-adaption, self-healing capability and uniform structural color is successfully prepared, the processability and the service life of the material are improved, and the application potential of the material in the fields of optical microsphere preparation, optical artware, optical coding and the like is preliminarily shown. The method specifically comprises the following steps: (1) the molding effect is good, and the molding can be carried out at will according to the mold, so that the adaptability is embodied; (2) the self-healing device has the advantages of self-healing, and can automatically repair the damaged structure; (3) the optical effect is good, the color is not angle-dependent and can not fade, and the method can be used in the fields of novel display and the like. The structural color of the scheme of the invention is formed by the amorphous nano structure without angle dependence.
Drawings
FIG. 1 is a schematic of a technical scheme for preparing borate reversible covalent bond based optical gels using silica colloidal particles; in FIG. 1, monodisperse colloidal silica particles (SiO)2) 3-propylene as small molecular functional monomerDissolving amido phenylboronic acid (3-APBA), complementary polymer polyvinyl alcohol (PVA), dimethylacrylamide (DMAm) and 2959 photoinitiator in a solvent dimethylacetamide (DMAc), and then carrying out ultraviolet photopolymerization to obtain the self-adaptive optical gel based on the borate reversible covalent bond;
a schematic diagram of a method for preparing borate ester based reversible covalent bond based optical gels using silica colloidal particles corresponding to the structure of the chemical materials used in figure 1 is shown in figure 2.
FIG. 3 is a diagram (a) of an object before and after polymerization of an optical gel and a corresponding spectrum (b), which shows that the system of the present invention has good compatibility with colloidal particles and does not cause aggregation and precipitation; and the colloidal particles are assembled into an ordered structure in the solution, and a bright structural color and a photon forbidden band are presented. See example 1 for a description of a specific preparation method; the upper row in the figure (a) is liquid before optical gel polymerization, the left, middle and right rows correspond to blue, green and red respectively, and gel formed after polymerization of the optical gel in the next row also corresponds to blue, green and red respectively. The spectrogram (b) corresponds to six curves for liquid and gel, respectively.
Fig. 4 is a self-healing capability test chart of the optical gel prepared by the above strategy. In the six figures, it can be seen that the optical gel presents a blue structural color (upper row left figure), the optical gel is cut by using a scalpel (upper row middle figure), the cut sections are put together (upper row right figure), as the borate bond in the gel structure is a dynamic covalent bond (lower row right figure), new borate bond is rapidly formed between molecules at the contact part of the sections again, the sections are bonded together (lower row middle figure), and finally the self-healing of the optical gel is realized (lower row left figure).
FIG. 5 illustrates the self-adaptive nature of the optical gel prepared, and it can be seen that the gel exhibits "liquid" like properties, can freely change shape, and structural color can be well maintained; and the prepared optical gel can obtain blue, green and red 'Fu' characters (corresponding to an upper figure, a middle figure and a lower figure respectively) by pouring a matrix, and shows good plasticity and processability.
Has the advantages that: the invention successfully endows the optical gel material with self-adaptive capacity by introducing the reversible covalent crosslinking network gel based on a boric acid system into the design of the photonic crystal composite material, improves the processability and prolongs the service life of the material, and specifically comprises the following steps: (1) the molding effect is good, and the molding can be carried out at will according to the mold, so that the adaptability is embodied; (2) the self-healing device has the advantages of self-healing, and can automatically repair the damaged structure; (3) the optical effect is good, the color is not angle-dependent and can not fade, and the method can be used in the fields of novel display and the like. Such adaptive optical gel materials may also be prepared by (1) changing the system solvent, (2) reversible self-healing bond types, and (3) by changing the structure-producing nanoparticles.
The specific implementation mode is as follows:
example 1
Monodisperse silicon dioxide microspheres with the particle diameters of 100nm, 130nm and 200nm are used as photonic crystal construction units and are dispersed in 1mL of dimethylacetamide (DMAc) solvent, and the mass fraction of the microspheres in the DMAc is controlled to be 50%; continuing to add 0.15g of dimethylacrylamide (DMAm), 0.05g of acrylamidophenylboronic acid (3-APBA), 50. mu.L of a 5% aqueous polyvinyl alcohol (PVA) solution, and 0.05g of 2959 photoinitiator to the mixture; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 7-8; and (3) carrying out ultraviolet curing for 30min at room temperature to obtain the optical gel with the colors of blue, yellow and red respectively (figure 2).
Example 2
Monodisperse silicon dioxide microspheres with the particle sizes of 100nm are used as photonic crystal construction units and are dispersed in 1mL of dimethylacetamide (DMAc) solvent, and the mass fraction of the microspheres in the DMAc is controlled to be 35%; to the mixture was added 0.1g of dimethylacrylamide (DMAm) and 0.05g of isopropylacrylamide, 0.05g of acrylamidophenylboronic acid (3-APBA), 50. mu.L of a 5% aqueous polyvinyl alcohol (PVA) solution and 0.05g of 2959 photoinitiator; after uniformly mixing, using 1MNaOH aqueous solution to adjust the pH of the mixed solution to 7-8; and (3) carrying out ultraviolet curing for 30min at room temperature to obtain the optical gel with structural color.
Example 3
Monodisperse silicon dioxide microspheres with the particle diameters of 400nm are used as photonic crystal construction units and are dispersed in 1mL of dimethylacetamide (DMAc) solvent, and the mass fraction of the microspheres in the DMAc is controlled to be 65%; continuing to add 0.25g of dimethylacrylamide (DMAm), 0.05g of acrylamidophenylboronic acid (3-APBA), 0.05g of dextran, and 0.05g of AIBN thermal initiator to the mixture; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 8-9; curing for 1h at the temperature of 80 ℃ to obtain the optical gel with structural color.
Example 4
Monodisperse silicon dioxide microspheres with the particle sizes of 700nm are used as photonic crystal construction units and are dispersed in 1mL of water, and the mass fraction of the microspheres in the water solution is controlled to be 60%; continuously adding 0.3g of polyethylene glycol acrylate, 0.05g of acrylamidophenylboronic acid (3-APBA), 50 mu L of 5% polyvinyl alcohol (PVA) aqueous solution and 0.05g of 2959 photoinitiator into the mixed solution; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 8-9; and (3) carrying out ultraviolet curing for 30min at room temperature to obtain the optical gel with structural color.
Example 5
Monodisperse polystyrene microspheres with the particle sizes of 110nm are used as photonic crystal construction units and are dispersed in 1mL of water, and the mass fraction of the microspheres in the water solution is controlled to be 55%; continuously adding 0.1g of isopropyl acrylamide, 0.1g of acrylamide, 0.05g of acrylamidophenylboronic acid (3-APBA), 50 mu L of 5% polyvinyl alcohol (PVA) aqueous solution and 0.05g of 2959 photoinitiator into the mixed solution; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 8-9; and (3) carrying out ultraviolet curing for 30min at room temperature to obtain the optical gel with structural color.
Example 6
Monodisperse polymethyl methacrylate microspheres with the particle diameters of 110nm are used as a construction unit of the photonic crystal and are dispersed in 1mL of mixed solvent of water and pyridine (the volume ratio of the water to the pyridine is 9:1), and the mass fraction of the microspheres in the mixed solvent is controlled to be 65%; continuously adding 0.15g of methyl hydroxyethyl acrylate, 0.03g of acrylamidophenylboronic acid (3-APBA), 50 mu L of 5% polyvinyl alcohol (PVA) aqueous solution and 0.05g of 2959 photoinitiator into the mixed solution; after uniformly mixing, using 1MNaOH aqueous solution to adjust the pH of the mixed solution to 8-9; and (3) carrying out ultraviolet curing for 15min at room temperature to obtain the optical gel with structural color.
Example 7
Monodisperse ferroferric oxide microspheres with the particle sizes of 90nm are used as photonic crystal construction units and are dispersed in 1mL of water, and the mass fraction of the microspheres in DMAc is controlled to be 0.5%; continuously adding 0.2g of acrylamide, 0.05g of acrylamidophenylboronic acid (3-APBA), 50 mu L of 5% polyvinyl alcohol (PVA) aqueous solution and 0.05g of 2959 photoinitiator into the mixed solution; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 8-9; and (3) carrying out room-temperature ultraviolet curing for 15min under the condition of an external magnetic field to obtain the optical gel with structural color.
Example 8
Monodisperse polystyrene/polyacrylate core-shell structure microspheres with the particle sizes of 110nm are used as construction units of photonic crystals and are dispersed in 1mL of water, and the mass fraction of the microspheres in the water is controlled to be 55%; continuously adding 0.15g of polyethylene glycol acrylate, 0.03g of acrylamidophenylboronic acid (3-APBA), 0.05g of glucan and 0.05g of APS thermal initiator into the mixed solution; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 8-9; curing for 3h at 75 ℃ to obtain the optical gel with structural color.
Example 9
Monodisperse titanium dioxide microspheres with the particle sizes of 90nm are used as construction units of photonic crystals and are dispersed in 1mL of water, and the mass fraction of the microspheres in the water is controlled to be 65%; continuously adding 0.05g of acrylamide, 0.1g of polyethylene glycol acrylate, 0.03g of acrylamidophenylboronic acid (3-APBA), 0.05g of dextran and 0.05g of APS thermal initiator into the mixed solution; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 8-9; curing for 3h at 75 ℃ to obtain the optical gel with structural color.
Example 10
Monodisperse titanium dioxide microspheres with the particle sizes of 90nm are used as construction units of photonic crystals and are dispersed in 1mL of dimethylacetamide (DMAc) solvent, and the mass fraction of the microspheres in the DMAc is controlled to be 70%; continuing to add 0.15g of dimethylacrylamide (DMAm), 0.05g of acrylamidophenylboronic acid (3-APBA), 50. mu.L of a 5% aqueous polyvinyl alcohol (PVA) solution, and 0.05g of 2959 photoinitiator to the mixture; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 7-8; and (3) carrying out ultraviolet curing for 30min at room temperature to obtain the optical gel.
Example 11
Monodisperse ferroferric oxide @ silicon dioxide core-shell microspheres with the particle sizes of 90nm are used as a construction unit of the photonic crystal and are dispersed in 1mL of mixed solvent of water and pyridine (the volume ratio of the water to the pyridine is 9:1), and the mass fraction of the microspheres in the mixed solvent is controlled to be 0.5%; continuing to add 0.2g of acrylamide, 0.05g of acrylamidophenylboronic acid (3-APBA), 50. mu.L of a 5% aqueous polyvinyl alcohol (PVA) solution, and 0.05g of 2959 photoinitiator to the mixture; after uniformly mixing, using 1MNaOH aqueous solution to adjust the pH of the mixed solution to 8-9; and (3) carrying out room-temperature ultraviolet curing for 15min under the condition of an external magnetic field to obtain the optical gel with structural color.
Example 12
Monodisperse ferroferric oxide @ silicon dioxide core-shell microspheres with the particle sizes of 110nm are used as a photonic crystal construction unit and are dispersed in 1mL of mixed solvent of water and pyridine (the volume ratio of the water to the pyridine is 9:1), and the mass fraction of the microspheres in the mixed solvent is controlled to be 70%; continuously adding 0.15g of methyl hydroxyethyl acrylate, 0.03g of acrylamidophenylboronic acid (3-APBA), 50 mu L of 5% polyvinyl alcohol (PVA) aqueous solution and 0.05g of 2959 photoinitiator into the mixed solution; after uniformly mixing, using 1M NaOH aqueous solution to adjust the pH of the mixed solution to 8-9; and (3) carrying out ultraviolet curing for 15min at room temperature to obtain the optical gel with structural color.

Claims (9)

1. A preparation method of optical gel with self-adaptive characteristic is characterized in that the optical gel is obtained by adding a comonomer, a micromolecule functional monomer containing phenylboronic acid functional group, a complementary macromolecule and an initiator into a dispersion liquid of monodisperse microspheres under a specific pH condition and then carrying out ultraviolet light or thermal polymerization; the pH is between 6 and 10; the types of monodisperse microspheres include: inorganic microspheres, silica microspheres, ferroferric oxide microspheres, titanium dioxide microspheres, and the like; organic microspheres, Polystyrene (PS) microspheres, polymethyl methacrylate (PMMA) microspheres, and the like; hybrid microspheres including core-shell structure microspheres and the like; the size of the monodisperse microsphere is between 80nm and 3 mu m.
2. The method of claim 1, wherein the monodisperse colloidal particles comprise between 0.5% and 70% by weight of the dispersion.
3. The method of claim 1, wherein the dispersion of monodisperse microspheres comprises the following components: one or more of water, dimethylacetamide (DMAc), acetone, bromocyclohexane, cis-decalin and pyridine solvent.
4. The method for preparing optical gel with self-adaptive characteristic according to claim 1, wherein the comonomer comprises one or more of vinyl monomers such as acrylamide, dimethylacrylamide, isopropylacrylamide, hydroxyethyl methyl acrylate, polyethylene glycol acrylate and the like; the complementary polymer includes: polyvinyl alcohol, dextran or polymer containing dopamine side chain.
5. Method for the preparation of an optical gel with adaptive properties according to one of claims 1 to 4, characterized in that the mass fraction of comonomer in the dispersion is controlled between 5 and 30%.
6. Method for the preparation of an optical gel with adaptive properties according to one of claims 1 to 4, characterized in that the functional monomer containing a phenylboronic acid functional group is generally 3-acrylamidophenylboronic acid or other small vinyl monomers (molecular weight less than 20kD) containing a phenylboronic acid functional group; the dosage of the functional monomer containing the phenylboronic acid functional group accounts for 0.01-10% of the mass fraction of the comonomer.
7. Method for the preparation of an optical gel with adaptive properties according to one of claims 1 to 4, characterized in that the amount of complementary macromolecules is between 0.01% and 10% by mass of the comonomer.
8. Method for the preparation of an optical gel of adaptive characteristics according to any one of claims 1 to 4, characterized in that the initiator is a general photoinitiator or thermal initiator, comprising: 2959, KPS, APS, AIBN.
9. The method of claim 1-4, wherein the size of the monodisperse microsphere is determined by the color of the optical gel, and the smaller the size, the color shifts to blue and vice versa.
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CN112830495A (en) * 2020-12-31 2021-05-25 苏州国纳思新材料科技有限公司 Preparation method of monodisperse colloid emulsion
CN114907523A (en) * 2022-05-07 2022-08-16 扬州大学 Codable monodisperse self-healing hydrogel microsphere and preparation method thereof
CN114940769A (en) * 2022-06-29 2022-08-26 中国人民解放军国防科技大学 Angle-independent electric response film based on structural color and preparation method and application thereof

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