CN115558069B - PH-sensitive polyurethane material and application thereof in construction of two-dimensional surface pattern and storage of force-induced structural color information - Google Patents
PH-sensitive polyurethane material and application thereof in construction of two-dimensional surface pattern and storage of force-induced structural color information Download PDFInfo
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- CN115558069B CN115558069B CN202211173811.2A CN202211173811A CN115558069B CN 115558069 B CN115558069 B CN 115558069B CN 202211173811 A CN202211173811 A CN 202211173811A CN 115558069 B CN115558069 B CN 115558069B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
- C08G18/3897—Low-molecular-weight compounds having heteroatoms other than oxygen containing heteroatoms other than oxygen, halogens, nitrogen, sulfur, phosphorus or silicon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
- C08G18/4269—Lactones
- C08G18/4277—Caprolactone and/or substituted caprolactone
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4825—Polyethers containing two hydroxy groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6633—Compounds of group C08G18/42
- C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/664—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
Abstract
The application relates to a pH sensitive polyurethane material and application thereof in constructing two-dimensional surface patterns and storing force-induced structural color information. The pH sensitive polyurethane material is a polyurethane material crosslinked or constructed by a coordination compound, wherein the coordination compound is polyfunctional acetylacetonate or difunctional acetylacetonate. The pH sensitive polyurethane material consists of dihydric alcohol, diisocyanate and polyfunctional acetylacetonate; or consists of a glycol, a diisocyanate, a difunctional acetylacetonate, and a trifunctional alcohol. The coordination compound is applied to construction of polyurethane materials, pH regulation and control of a material structure can be realized based on pH sensitivity characteristics of coordination bonds, and preparation of a surface two-dimensional pattern and observation of a force-induced structural color pattern are realized through stress stimulation. Meanwhile, the design thought can be combined with a plurality of existing systems, raw materials are cheap and easy to obtain, and the preparation process is simple. Has potential application value in the fields of intelligent materials and information storage.
Description
Technical Field
The application relates to the technical field of information storage by using high polymer material polyurethane, in particular to a pH sensitive polyurethane material and a preparation method thereof, and application thereof in constructing two-dimensional surface patterns and storing force-induced structural color information.
Background
At present, in the preparation and research of two-dimensional patterns on the surface of a material, the adopted technical means mostly need complex forming process and mold assistance, and the process is tedious and difficult to prepare. Meanwhile, in the aspect of information storage, the fluorescent material and other complex raw materials and the preparation process are used.
Based on the pH sensitive characteristic of coordination bonds, the pH regulation and control of the material structure can be realized, and the preparation of the surface two-dimensional pattern and the observation of the mechanochromatic pattern can be realized through the stimulation of stress. Meanwhile, the design thought can be combined with a plurality of existing systems, raw materials are cheap and easy to obtain, and the preparation process is simple. Has potential application value in the fields of intelligent materials and information storage.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides a pH sensitive polyurethane material, a preparation method thereof and application thereof in constructing two-dimensional surface patterns and storing force-induced structural color information. The coordination compound is applied to construction of polyurethane materials, pH regulation and control of a material structure can be realized based on pH sensitivity characteristics of coordination bonds, and preparation of a surface two-dimensional pattern and observation of a force-induced structural color pattern are realized through stress stimulation. Meanwhile, the design thought can be combined with a plurality of existing systems, raw materials are cheap and easy to obtain, and the preparation process is simple. Has potential application value in the fields of intelligent materials and information storage.
The application provides a pH sensitive polyurethane material, which is a polyurethane material crosslinked by a coordination compound or participating in construction.
Further, the coordination compound is polyfunctional acetylacetonate or difunctional acetylacetonate.
Further, the pH-sensitive polyurethane material consists of dihydric alcohol (x), diisocyanate (m) and polyfunctional acetylacetonate (n) according to the molar ratio of x to m to n of 2x+3n=2m.
Further, the pH-sensitive polyurethane material consists of dihydric alcohol (x), diisocyanate (m), difunctional acetylacetonate (y) and trifunctional alcohol (z) according to the molar ratio of x to m to y to z, wherein the molar ratio of x to m to y is 2 m=2x+2y+3z.
Further, the polyfunctional acetylacetonate is at least one selected from aluminum (III) acetylacetonate, iron (III) acetylacetonate, cobalt (III) acetylacetonate, zirconium (III) acetylacetonate, chromium (III) acetylacetonate, manganese (III) acetylacetonate, cerium (III) acetylacetonate, ruthenium (III) acetylacetonate, europium (III) acetylacetonate, zirconium (IV) acetylacetonate, and vanadyl (IV) acetylacetonate.
Further, the difunctional acetylacetonate is at least one selected from nickel (II) acetylacetonate, iron (II) acetylacetonate, zinc (II) acetylacetonate, calcium (II) acetylacetonate, molybdenum (II) acetylacetonate, palladium (II) acetylacetonate and cobalt (II) acetylacetonate.
Further, the dihydric alcohol is at least one selected from polyether dihydric alcohol, polytetrahydrofuran dihydric alcohol, polycaprolactone dihydric alcohol and alkyl dihydric alcohol.
Further, the diisocyanate is selected from at least one of 4, 4-diisocyanate dicyclohexylmethane, isophorone diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, 4' -diphenylmethane diisocyanate, etc. and oligomers thereof containing two isocyanate groups.
The application also provides a preparation method of the pH-sensitive polyurethane material, which comprises the following steps:
a. dissolving polyfunctional acetylacetonate, dihydric alcohol and diisocyanate in an organic solvent, uniformly mixing, removing the organic solvent, and reacting and forming; wherein the molar ratio of the dihydric alcohol (x), the diisocyanate (m) and the polyfunctional acetylacetonate (n) is sequentially expressed as x, m, n satisfying 2x+3n=2m;
or b, dissolving the difunctional acetylacetonate, dihydric alcohol, diisocyanate and trifunctional alcohol in an organic solvent, uniformly mixing, removing the organic solvent, and reacting and forming; wherein the molar ratio of the dihydric alcohol (x), the diisocyanate (m), the difunctional acetylacetonate (y) and the trifunctional alcohol (z) is sequentially as x: m: y: z, and 2m=2x+2y+3z is satisfied.
Further, the organic solvent is selected from any one of acetone, tetrahydrofuran, chloroform, methylene chloride, dimethyl sulfoxide, 1, 4-dioxane, N '-dimethylformamide, N' -dimethylacetamide, N-methyl-pyrrolidone, benzene, toluene or xylene.
Further, the organic solvent is removed at a temperature of 40-100 ℃; the preferred temperature range is 60-90 ℃.
The application provides application of the pH-sensitive polyurethane material in construction of two-dimensional surface patterns and storage of force-induced structural color information.
Further, the application is a method for constructing a two-dimensional surface pattern and storing the force-induced structural color information by using an acidic solution, comprising the following steps: writing patterns and information on the pH sensitive polyurethane material by using an acid solution, and then stretching the pH sensitive polyurethane material to obtain three-dimensional transformation and force-induced structural color patterns or information; if the pattern is required to be erased, the written material is heated.
Further, the acidic solution is acetic acid, propionic acid, butyric acid, valeric acid, methane sulphonic acid, oxalic acid, and inorganic acid soluble in organic solvents.
Further, the temperature of the heating treatment is controlled to be 80-100 ℃.
Further, the application is a method for constructing a two-dimensional surface pattern and storing force-induced structural color information by using ultraviolet light, comprising the following steps: adding a photoacid generator into a pH-sensitive polyurethane material system, covering the pH-sensitive polyurethane material with a template, irradiating with ultraviolet light with the wavelength of more than 300nm, and stretching to obtain a two-dimensional surface pattern and a force-induced structural color pattern; if the pattern is required to be erased, the written material is heated.
Further, the photoacid generator is an iodic salt or a sulfur salt; preferably, the iodized salt is tert-butyl phenyl iodonium salt perfluorooctane sulfonate and derivatives thereof; the sulfur salt is triphenylsulfonium perfluorobutane sulfonic acid, triphenylsulfonium perfluorobutyl or triphenylsulfonium trifluoro sulfonic acid and derivatives thereof, and spiral pyrans and derivatives thereof; the addition amount of the photoacid generator is 0.01-10%.
Further, the temperature of the heating treatment is controlled at 160 ℃.
The pH-sensitive polyurethane material of the present application is a coordination compound crosslinked polyurethane material. According to the application, as the coordination bond is broken under an acidic condition, the material can be subjected to decrosslinking under the acidic condition and converted into a linear structure to stretch a sample after information writing, and stress behaviors with different responsivity enable the sample to generate shape transformation and a force-induced structural color pattern developed under a polarized light condition. It is heated and the written information can be erased. Further, ultraviolet light regulation of the pH value of the system is realized by adding the photoacid generator into the polyurethane system. With the help of the mask, the ultraviolet light irradiates and stretches to generate a two-dimensional pattern and a force-induced structural color pattern developed under polarized light. Based on the thermo-reversible crosslinking in the system, the pattern and the information can be erased by heating.
Compared with the prior art, the application has the beneficial effects that:
the application utilizes acetylacetone salt to participate in constructing the pH sensitive polyurethane material, and has simple preparation method, easily obtained raw materials and lower cost. The obtained polyurethane material can be used for writing information by using an acid solution or preparing an accurate pattern by using ultraviolet irradiation to realize information storage. The patterns are accurate and controllable, the force-induced structural color patterns observed after deformation are easy to read, and the method has potential application value in the aspects of intelligent responsive materials and information storage, and can be widely applied to the fields of anti-counterfeiting trademarks and the like.
Drawings
FIG. 1 is a stress-strain curve for the polyurethane material of example 1;
FIG. 2 is a force induced structural color pattern and shape transition after release of the acid-written pattern in example 2 in a stretched state;
FIG. 3 is a force-induced structural color pattern and a released two-dimensional surface pattern of the ultraviolet light written pattern in the stretched state of example 3, and the force-induced structural color pattern written by the modified method;
fig. 4 is erasing and rewriting of the pattern in embodiment 4.
Detailed Description
The technical scheme of the application is further described below with reference to the accompanying drawings and the embodiments. The following examples are further illustrative of the application and are not intended to limit the scope of the application.
Each of the raw material components in the following examples is commercially available.
Example 1
0.1081 g of aluminum acetylacetonate, 0.5886 g of hexamethylene diisocyanate and 3 g of polytetrahydrofuran diol (m=1000) were dissolved in 20mL of tetrahydrofuran and reacted at 40℃for 12 hours. And drying the mixture for 12 hours in a vacuum oven at 40 ℃ to obtain the pH-sensitive polyurethane material constructed by aluminum acetylacetonate. Fig. 1 is a stress-strain curve of the polyurethane material.
Example 2
0.1297 g of aluminum acetylacetonate, 0.6055 g of hexamethylene diisocyanate and 3 g of polytetrahydrofuran diol (m=1000) were dissolved in 20mL of tetrahydrofuran and reacted at 40℃for 12 hours. And drying the mixture for 12 hours in a vacuum oven at 40 ℃ to obtain the pH-sensitive polyurethane material constructed by aluminum acetylacetonate.
Example 3
0.1412 g of iron (III) acetylacetonate, 0.6055 g of hexamethylene diisocyanate and 3 g of polycaprolactone diol (m=1000) were dissolved in 20mL of tetrahydrofuran and reacted at 40 ℃ for 12 hours. Drying the mixture for 12 hours at 40 ℃ in a vacuum oven to obtain the pH-sensitive polyurethane material built by the participation of the iron (III) acetylacetonate.
Example 4
0.1443 g of cobalt (III) acetylacetonate, 0.6055 g of hexamethylene diisocyanate and 3 g of polytetrahydrofuran diol (m=1000) were dissolved in 20mL of tetrahydrofuran and reacted at 40 ℃ for 12 hours. Drying the mixture for 12 hours at 40 ℃ in a vacuum oven to obtain the pH-sensitive polyurethane material constructed by the cobalt (III) acetylacetonate.
Example 5
0.1192 g of calcium acetylacetonate, 0.504 g of hexamethylene diisocyanate, 0.0306 g of glycerol and 2 g of polytetrahydrofuran diol (m=1000) are dissolved in 20mL of tetrahydrofuran and reacted for 12 hours at 40 ℃. And drying the mixture for 12 hours in a vacuum oven at 40 ℃ to obtain the pH-sensitive polyurethane material constructed by the calcium acetylacetonate.
Example 6
0.1319 g of zinc acetylacetonate, 0.504 g of hexamethylene diisocyanate, 0.0306 g of glycerol and 2 g of polyethylene glycol diol (m=1000) are dissolved in 20mL of tetrahydrofuran and reacted for 12 hours at 40 ℃. And drying the mixture for 12 hours at 40 ℃ in a vacuum oven to obtain the pH-sensitive polyurethane material constructed by zinc acetylacetonate.
Example 7
0.1642 g of molybdenum acetylacetonate, 0.504 g of hexamethylene diisocyanate, 0.0306 g of glycerol and 2 g of polypropylene glycol diol (m=1000) are dissolved in 20mL of tetrahydrofuran and reacted for 12 hours at 40 ℃. And drying the mixture for 12 hours at the temperature of 40 ℃ in a vacuum oven to obtain the pH-sensitive polyurethane material constructed by the participation of the molybdenum acetylacetonate.
Application example 1
The pH-sensitive polyurethane surface prepared in example 1 was written with acetic acid, and the information-written sample was stretched, during which a structural color pattern was observed under polarized light, see fig. 2.
Application example 2
The pH-sensitive polyurethane material added with the photoacid generator (3% of diphenyliodonium hexafluorophosphate) is subjected to ultraviolet light irradiation treatment for 5 minutes at 365nm wavelength by adding a template, and a sample after information writing is stretched, and in the stretching process, a structural color pattern can be observed under polarized light, as shown in figure 3. After releasing the stretching, the surface produces a two-dimensional pattern that conforms to the template.
The information-written sample was heated at 160 ℃ for 30 minutes, the pattern was erased, the sample was restored to its original uniform shape, and templates of other shapes were added, and the sample was again able to write information (fig. 4).
While the preferred embodiments of the present application have been described in detail, the present application is not limited to the embodiments, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.
Claims (12)
1. A pH-sensitive polyurethane material, which is a polyurethane material crosslinked by a coordination compound, wherein coordination bonds are broken under acidic conditions, the material is subject to uncrosslinking, and the coordination compound is polyfunctional acetylacetonate, characterized in that: consists of x moles of dihydric alcohol, m moles of diisocyanate and n moles of polyfunctional acetylacetonate according to the molar ratio x: m: n satisfying 2x+3n=2m;
the dihydric alcohol is at least one selected from polyether dihydric alcohol, polytetrahydrofuran dihydric alcohol, polycaprolactone dihydric alcohol and alkyl dihydric alcohol;
the polyfunctional acetylacetonate is at least one selected from aluminum (III) acetylacetonate, iron (III) acetylacetonate, cobalt (III) acetylacetonate, zirconium (III) acetylacetonate, chromium (III) acetylacetonate, manganese (III) acetylacetonate, cerium (III) acetylacetonate, ruthenium (III) acetylacetonate and europium (III) acetylacetonate.
2. A pH-sensitive polyurethane material crosslinked by a coordination compound, which is a difunctional acetylacetonate, wherein the coordination bond is broken under acidic conditions, and the material is uncrosslinked, characterized in that: consists of x moles of dihydric alcohol, m moles of diisocyanate, y moles of difunctional acetylacetonate and z moles of trifunctional alcohol according to the molar ratio x:y:z, wherein the molar ratio x:y:z satisfies 2m=2x+2y+3z;
the dihydric alcohol is at least one selected from polyether dihydric alcohol, polytetrahydrofuran dihydric alcohol, polycaprolactone dihydric alcohol and alkyl dihydric alcohol;
the difunctional acetylacetonate is at least one selected from nickel (II) acetylacetonate, iron (II) acetylacetonate, zinc (II) acetylacetonate, calcium (II) acetylacetonate, molybdenum (II) acetylacetonate, palladium (II) acetylacetonate and cobalt (II) acetylacetonate.
3. A pH sensitive polyurethane material according to claim 1 or 2, characterized in that: the diisocyanate is at least one selected from 4, 4-diisocyanate dicyclohexylmethane, isophorone diisocyanate, hexamethylene diisocyanate, toluene diisocyanate and 4, 4' -diphenylmethane diisocyanate.
4. The method for preparing a pH-sensitive polyurethane material according to claim 1, comprising:
dissolving polyfunctional acetylacetonate, dihydric alcohol and diisocyanate in an organic solvent, and uniformly mixing;
then removing the organic solvent at 40-100 ℃ and reacting and forming.
5. The method for preparing a pH-sensitive polyurethane material according to claim 2, comprising:
dissolving difunctional acetylacetonate, dihydric alcohol, diisocyanate and trifunctional alcohol in an organic solvent and uniformly mixing;
then removing the organic solvent at 40-100 ℃ and reacting and forming.
6. The method for preparing a pH-sensitive polyurethane material according to claim 4 or 5, comprising: the organic solvent is selected from any one of acetone, tetrahydrofuran, chloroform, dichloromethane, dimethyl sulfoxide, 1, 4-dioxane, N '-dimethylformamide, N' -dimethylacetamide, N-methyl-pyrrolidone, benzene, toluene or xylene.
7. Use of a pH-sensitive polyurethane material according to any one of claims 1-3 for the construction of two-dimensional surface patterns and for the storage of force-induced structural color information.
8. The use according to claim 7, characterized in that: the application is that an acid solution is utilized to write patterns and information on the pH sensitive polyurethane material, and then the pH sensitive polyurethane material is stretched to obtain three-dimensional transformation and force-induced structural color patterns or information; if the pattern is required to be erased, the written material is heated.
9. The use according to claim 8, characterized in that: the acidic solution is acetic acid, propionic acid, butyric acid, valeric acid, methane sulfonic acid or oxalic acid.
10. The use according to claim 8, characterized in that: the temperature of the heating treatment is controlled between 80 and 100 ℃.
11. The use according to claim 7, characterized in that: the application is that a photoacid generator is added into a pH sensitive polyurethane material system, then the pH sensitive polyurethane material is covered by a template, and then is irradiated by ultraviolet light with the wavelength of more than 300nm, and is subjected to stretching treatment to obtain a two-dimensional surface pattern and a force-induced structural color pattern; if the pattern is required to be erased, heating the written material, wherein the photoinduced acid generator is iodized salt or sulfur salt; the addition amount of the photoacid generator is 0.01-10%.
12. The use according to claim 11, characterized in that: the temperature of the heating treatment is controlled at 160 ℃.
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| CN202211173811.2A CN115558069B (en) | 2022-09-26 | 2022-09-26 | PH-sensitive polyurethane material and application thereof in construction of two-dimensional surface pattern and storage of force-induced structural color information |
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| CN202211173811.2A CN115558069B (en) | 2022-09-26 | 2022-09-26 | PH-sensitive polyurethane material and application thereof in construction of two-dimensional surface pattern and storage of force-induced structural color information |
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