CN116284566A - Photo-curing slurry and organic hydrogel for high-elasticity wearable strain sensor and preparation method thereof - Google Patents
Photo-curing slurry and organic hydrogel for high-elasticity wearable strain sensor and preparation method thereof Download PDFInfo
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- 239000000017 hydrogel Substances 0.000 title claims abstract description 52
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- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
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- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 165
- XLPJNCYCZORXHG-UHFFFAOYSA-N 1-morpholin-4-ylprop-2-en-1-one Chemical group C=CC(=O)N1CCOCC1 XLPJNCYCZORXHG-UHFFFAOYSA-N 0.000 claims description 72
- 235000011187 glycerol Nutrition 0.000 claims description 56
- 239000002202 Polyethylene glycol Substances 0.000 claims description 45
- 125000004386 diacrylate group Chemical group 0.000 claims description 45
- 229920001223 polyethylene glycol Polymers 0.000 claims description 45
- 238000000498 ball milling Methods 0.000 claims description 24
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- 239000000178 monomer Substances 0.000 claims description 19
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 16
- 238000010382 chemical cross-linking Methods 0.000 claims description 16
- 239000003431 cross linking reagent Substances 0.000 claims description 13
- 238000001723 curing Methods 0.000 claims description 13
- 239000000945 filler Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 239000011780 sodium chloride Substances 0.000 claims description 8
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 6
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- GUCYFKSBFREPBC-UHFFFAOYSA-N [phenyl-(2,4,6-trimethylbenzoyl)phosphoryl]-(2,4,6-trimethylphenyl)methanone Chemical group CC1=CC(C)=CC(C)=C1C(=O)P(=O)(C=1C=CC=CC=1)C(=O)C1=C(C)C=C(C)C=C1C GUCYFKSBFREPBC-UHFFFAOYSA-N 0.000 claims description 2
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
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- C08F2/00—Processes of polymerisation
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Abstract
The invention discloses a photo-curing slurry and an organic hydrogel for a high-elasticity wearable strain sensor, and a preparation method and application thereof, and belongs to the technical field of flexible wearable electronic device materials; the photocuring slurry and the organic hydrogel which can be used for the high-elasticity wearable strain sensor and the preparation method thereof are controlled by reasonable arrangement of components in the photocuring slurry and the preparation means of the organic hydrogel; the rebound performance of the organic hydrogel sensor is remarkably improved; the cured organic hydrogel has good water absorption/retention property, stretchability and rebound resilience, and is used as a wearable strain sensor.
Description
Technical Field
The invention belongs to the technical field of flexible wearable electronic device materials, and particularly relates to a photo-curing slurry and an organic hydrogel for a high-elasticity wearable strain sensor and a preparation method thereof.
Background
The organic hydrogel strain sensor has good flexibility, can be attached to the skin surface of a human body, has important application in the fields of health monitoring, artificial intelligence, electronic skin and the like, and has the working principle of converting an external mechanical signal into an electrical signal which is easy to process.
However, conventional organic hydrogel strain sensors have the following drawbacks: 1. the organic hydrogel is easy to dehydrate, so that the stability of the sensor is affected; 2. the organic hydrogel cannot rebound completely, so that obvious hysteresis occurs in the use process, the mechanical strength is seriously reduced, the feedback of the electric signal is inaccurate, and the service life is greatly reduced. In addition to the problems with organic hydrogel performance, the preparation of organic hydrogel strain sensors remains a challenge. The traditional preparation technology has long preparation time and complex procedures, and greatly limits the mass production of the strain sensor. Furthermore, conventional methods can only produce simple structures, such as square, elongated structures, limiting the customisation and wearable applications of strain sensors. Along with the development of the intellectualization and customization of wearable electronic products, the development of organic hydrogel strain sensors with structural diversity is of great importance.
Unlike conventional manufacturing processes, 3D printing forms articles by stacking layers. As one of the most mature 3D printing techniques, photo-curing 3D printing is widely used to produce high precision structures, the curing principle of which is to make a photosensitive resin undergo radical polymerization by irradiating it with ultraviolet light. Although commercial elastic photosensitive resins have good elasticity, they have poor stretchability and cannot meet the demands of strain sensors. Accordingly, development of a photocurable paste for stretchable, highly elastic and wearable strain sensors is urgent.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem of poor usability of flexible wearable electronic device materials in the prior art, the light-cured slurry, the organic hydrogel and the preparation method thereof, which can be used for the high-elasticity wearable strain sensor, are provided, and the technical problems are improved through reasonable arrangement of components in the light-cured slurry and control of the preparation means of the organic hydrogel.
2. Technical proposal
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention discloses an organic hydrogel for a high-elasticity wearable strain sensor, which comprises a monomer, a water-retaining agent, a chemical cross-linking agent, a photoinitiator and an ion-conducting filler, wherein the monomer is acryloylmorpholine, and the chemical cross-linking agent is polyethylene glycol diacrylate.
Preferably, the contents of the monomer, the water-retaining agent, the chemical crosslinking agent, the photoinitiator and the ion-conducting filler are respectively as follows:
preferably, the water-retaining agent is one or more of glycerol, ethylene glycol and propylene glycol.
Preferably, the photoinitiator is phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide.
Preferably, the ion-conducting filler is sodium chloride.
Preferably, the organic hydrogel is prepared from a photo-curing paste which can be used for the high-elasticity wearable strain sensor, and the photo-curing paste which can be used for the high-elasticity wearable strain sensor is the photo-curing paste.
The invention relates to a preparation method of an organic hydrogel for a high-elasticity wearable strain sensor, which is characterized in that the organic hydrogel for the high-elasticity wearable strain sensor is prepared by the following steps:
s1, mixing a monomer, a photoinitiator, an ion-conducting filler and a grinding aid, and performing first-stage ball milling after mixing to obtain monomer slurry; adding a water-retaining agent and a chemical cross-linking agent into the monomer slurry after the first-stage ball milling is finished, and then performing the second-stage ball milling, and filtering a grinding aid through the second-stage ball milling to prepare a photo-curing slurry;
s2, carrying out ultraviolet light curing molding on the photo-curing slurry;
s3, performing ultraviolet light curing and forming, and then performing water absorption to prepare the organic hydrogel for the high-elasticity wearable strain sensor.
Preferably, S1 is placed in a dry environment after the photo-curable paste is prepared, preventing the photo-curable paste from absorbing water.
Preferably, the ultraviolet light wavelength in S2 is 405nm, the layer thickness is 2-100 μm, and the ultraviolet light intensity is 2-30mW/cm 2 The exposure time is 0.1-20s.
Preferably, the water absorption environment in S3 is: temperature: 22-27 ℃, humidity: 40-65%, and water absorption for 12-720h.
A strain sensor according to the invention is prepared from the organic hydrogel according to claim 5.
The application of the organic hydrogel for the high-elasticity wearable strain sensor provided by the invention is that the organic hydrogel is used as a material of the strain sensor.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention discloses an organic hydrogel for a high-elasticity wearable strain sensor, which comprises a monomer, a water-retaining agent, a chemical cross-linking agent, a photoinitiator and an ion-conducting filler, wherein the monomer is acryloylmorpholine, and the chemical cross-linking agent is polyethylene glycol diacrylate; the water-retaining agent is introduced into the acryloylmorpholine organic hydrogel, so that the saturated vapor pressure of the water-retaining agent is effectively reduced, the water-retaining performance of a subsequent organic hydrogel product is ensured, in addition, the covalent crosslinking point of a polymer in the acryloylmorpholine/water-retaining agent can be increased by introducing polyethylene glycol diacrylate, and the rebound performance of the organic hydrogel sensor is obviously improved; the cured organic hydrogel has good water absorption/retention property, stretchability and rebound resilience, and is used as a wearable strain sensor.
(2) The invention relates to a preparation method of an organic hydrogel for a high-elasticity wearable strain sensor, which is characterized in that the organic hydrogel for the high-elasticity wearable strain sensor is prepared by the following steps: s1, mixing a monomer, a photoinitiator, an ion-conducting filler and a grinding aid, and performing first-stage ball milling after mixing to obtain monomer slurry; adding a water-retaining agent and a chemical cross-linking agent into the monomer slurry after the first-stage ball milling is finished, and then performing the second-stage ball milling, and filtering a grinding aid through the second-stage ball milling to prepare a photo-curing slurry; s2, carrying out ultraviolet light curing molding on the photo-curing slurry; s3, performing ultraviolet light curing and forming, and then performing water absorption to prepare the organic hydrogel applicable to the high-elasticity wearable strain sensor; in the steps, the monomer, the water-retaining agent, the chemical cross-linking agent, the photoinitiator and the ion-conducting filler are mixed and ball-milled in stages, so that the monomer, the photoinitiator and the ion-conducting filler fully form a photocuring system, and then the water-retaining agent and the chemical cross-linking agent locally carry out water retention and chemical cross-linking around the photocuring system through second stage ball milling, so that the subsequent photocuring effect is improved, and the problems that the existing photocuring slurry and the printed organic hydrogel product are easy to dehydrate, poor in rebound resilience and customized to wear are solved.
Drawings
FIG. 1 is a graph of the relative mass change of an acryloylmorpholine, acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured product;
in fig. 2: (a) A photograph of the stretch and rebound of the cured product of (a) acryloylmorpholine/glycerol and (b) acryloylmorpholine/glycerol/polyethylene glycol diacrylate;
in fig. 3: (a) A stress-strain curve of 100 cycles of the cured product of acryloylmorpholine/glycerol and (b) acryloylmorpholine/glycerol/polyethylene glycol diacrylate at a tensile strain of 100%;
FIG. 4 is a graph showing the relative resistance change of an acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured article under different strains;
fig. 5 is a photograph of a 3D printed acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured product having a porous structure and in use.
Detailed Description
The following more detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely illustrative and not limiting of the invention's features and characteristics in order to set forth the best mode of carrying out the invention and to sufficiently enable those skilled in the art to practice the invention. It will be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the invention or the application and field of application of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; the terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The specific conditions are not noted in the examples and are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
The invention is further described below in connection with specific embodiments.
Example 1
1) Preparation of photo-curing slurry of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
69.3g of acryloylmorpholine, 0.7g of TPO,0.05g of sodium chloride and 300g of zirconia balls are weighed, added into a 250ml zirconia ball mill pot and ball-milled for 10min at the speed of 360r/min, so as to obtain the acryloylmorpholine slurry. Then adding 30g of glycerol and 0.25g of polyethylene glycol diacrylate into a ball milling tank, ball milling for 30min at the speed of 360r/min, filtering zirconia balls by using a strainer to obtain the photo-curing slurry of the acryloylmorpholine/glycerol/polyethylene glycol diacrylate, and storing the photo-curing slurry in a closed container to prevent the photo-curing printing from being affected by water absorption of photosensitive resin. The resin absorbs water to increase the adhesion of the printed product, making it difficult to remove the printed sample from the platform.
2) Preparation of photo-curing 3D printing product of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
And (3) carrying out ultraviolet curing molding on the prepared sizing agent by adopting a photocuring 3D printer. The ultraviolet wavelength is 405nm, the layer thickness is 20 mu m, and the ultraviolet intensity is 5mW/cm 2 The exposure time was 3s. The printing product with the acryloylmorpholine/glycerol/polyethylene glycol diacrylate is prepared. The product is placed under the condition of room temperature (the temperature is 22-27 ℃ and the humidity is 40-65%) to absorb water for 24 hours, and the acryloylmorpholine/glycerol/polyethylene glycol diacrylate organic hydrogel is obtained.
Example 2
1) Preparation of photo-curing slurry of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
69.3g of acryloylmorpholine, 0.7g of TPO,0.05g of sodium chloride and 300g of zirconia balls are weighed, added into a 250ml zirconia ball mill pot and ball-milled for 10min at the speed of 360r/min, so as to obtain the acryloylmorpholine slurry. Then adding 30g of glycerol and 0.5g of polyethylene glycol diacrylate into a ball milling tank, ball milling for 30min at the speed of 360r/min, filtering zirconia balls by using a strainer to obtain the photo-curing slurry of the acryloylmorpholine/glycerol/polyethylene glycol diacrylate, and storing the photo-curing slurry in a closed container to prevent the photo-curing printing from being affected by water absorption of photosensitive resin. The resin absorbs water to increase the adhesion of the printed product, making it difficult to remove the printed sample from the platform.
2) Preparation of photo-curing 3D printing product of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
And (3) carrying out ultraviolet curing molding on the prepared sizing agent by adopting a photocuring 3D printer. The ultraviolet wavelength is 405nm, the layer thickness is 20 mu m, and the ultraviolet intensity is 5mW/cm 2 The exposure time was 3s. The printing product with the acryloylmorpholine/glycerol/polyethylene glycol diacrylate is prepared. The product is placed under the condition of room temperature (the temperature is 22-27 ℃ and the humidity is 40-65%) to absorb water for 24 hours, and the acryloylmorpholine/glycerol/polyethylene glycol diacrylate organic hydrogel is obtained.
Example 3
1) Preparation of photo-curing slurry of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
69.3g of acryloylmorpholine, 0.7g of TPO,0.05g of sodium chloride and 300g of zirconia balls are weighed, added into a 250ml zirconia ball mill pot and ball-milled for 10min at the speed of 360r/min, so as to obtain the acryloylmorpholine slurry. Then adding 30g of glycerol and 1g of polyethylene glycol diacrylate into a ball milling tank, ball milling for 30min at the speed of 360r/min, filtering zirconia balls by using a strainer to obtain the photo-curing slurry of the acryloylmorpholine/glycerol/polyethylene glycol diacrylate, and storing the photo-curing slurry in a closed container to prevent the photo-curing printing from being influenced by water absorption of photosensitive resin. The resin absorbs water to increase the adhesion of the printed product, making it difficult to remove the printed sample from the platform.
2) Preparation of photo-curing 3D printing product of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
And (3) carrying out ultraviolet curing molding on the prepared sizing agent by adopting a photocuring 3D printer. The ultraviolet wavelength is 405nm, the layer thickness is 20 mu m, and the ultraviolet intensity is 5mW/cm 2 The exposure time was 3s. The printing product with the acryloylmorpholine/glycerol/polyethylene glycol diacrylate is prepared. The product is placed under the condition of room temperature (the temperature is 22-27 ℃ and the humidity is 40-65%) to absorb water for 24 hours, and the acryloylmorpholine/glycerol/polyethylene glycol diacrylate organic hydrogel is obtained.
Example 4
1) Preparation of photo-curing slurry of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
69.3g of acryloylmorpholine, 0.7g of TPO,0.05g of sodium chloride and 300g of zirconia balls are weighed, added into a 250ml zirconia ball mill pot and ball-milled for 10min at the speed of 360r/min, so as to obtain the acryloylmorpholine slurry. Then adding 30g of glycerol and 5g of polyethylene glycol diacrylate into a ball milling tank, ball milling for 30min at the speed of 360r/min, filtering zirconia balls by using a strainer to obtain the photo-curing slurry of the acryloylmorpholine/glycerol/polyethylene glycol diacrylate, and storing the photo-curing slurry in a closed container to prevent the photo-curing printing from being influenced by water absorption of photosensitive resin. The resin absorbs water to increase the adhesion of the printed product, making it difficult to remove the printed sample from the platform.
2) Preparation of photo-curing 3D printing product of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
And (3) carrying out ultraviolet curing molding on the prepared sizing agent by adopting a photocuring 3D printer. The ultraviolet wavelength is 405nm, the layer thickness is 20 mu m, and the ultraviolet intensity is 5mW/cm 2 The exposure time was 3s. The printing product with the acryloylmorpholine/glycerol/polyethylene glycol diacrylate is prepared. The product is placed under the condition of room temperature (the temperature is 22-27 ℃ and the humidity is 40-65%) to absorb water for 24 hours, and the acryloylmorpholine/glycerol/polyethylene glycol diacrylate organic hydrogel is obtained.
Comparative example 1
(1) Preparation of photo-curing acryl morpholine slurry
69.3g of acryloylmorpholine, 0.7g of TPO,0.05g of sodium chloride and 300g of zirconia balls are weighed into a 250ml zirconia ball mill tank, ball milling is carried out for 10min at the speed of 360r/min, and the zirconia balls are filtered by a strainer to obtain the acryloylmorpholine photocuring slurry.
(2) Preparation of Acryloylmorpholine photo-cured 3D printing products
And (3) carrying out ultraviolet curing molding on the prepared sizing agent by adopting a photocuring 3D printer. The ultraviolet wavelength is 405nm, the layer thickness is 20 mu m, and the ultraviolet intensity is 5mW/cm 2 The exposure time was 3s. And preparing the printing product with the acryloylmorpholine. The product is placed under the condition of room temperature (the temperature is 22-27 ℃ and the humidity is 40-65%) to absorb water for 24 hours, and the acryloylmorpholine organic hydrogel is obtained.
Comparative example 2
1) Preparation of Acryloylmorpholine/glycerol photo-curing slurry
69.3g of acryloylmorpholine, 0.7g of TPO,0.05g of sodium chloride and 300g of zirconia balls are weighed, added into a 250ml zirconia ball mill pot and ball-milled for 10min at the speed of 360r/min, so as to obtain the acryloylmorpholine slurry. Then adding 30g of glycerol into a ball milling tank, ball milling for 30min at the speed of 360r/min, filtering out zirconia balls by using a strainer to obtain the acryloylmorpholine/glycerol photocuring slurry, and storing the slurry in a closed container to prevent the photosensitive resin from absorbing water to influence the photocuring printing. The resin absorbs water to increase the adhesion of the printed product, making it difficult to remove the printed sample from the platform.
2) Preparation of acryloylmorpholine/glycerol photocuring 3D printing product
And (3) carrying out ultraviolet curing molding on the prepared sizing agent by adopting a photocuring 3D printer. The ultraviolet wavelength is 405nm, the layer thickness is 20 mu m, and the ultraviolet intensity is 5mW/cm 2 The exposure time was 3s. The printed product with acryloylmorpholine/glycerin is prepared. The product is placed under the condition of room temperature (the temperature is 22-27 ℃ and the humidity is 40-65%) to absorb water for 24 hours, and the acryloylmorpholine/glycerin organic hydrogel is obtained.
The photo-curing slurries prepared in examples 1 to 4 and comparative examples 1 to 2 were subjected to index property verification as shown in table 1. As can be seen from Table 1, in several examples, the resin viscosity was less than 60 mPas, which is suitable for use in photo-curing 3D printing.
TABLE 1 photo-curing syrup of acryloylmorpholine/glycerol/polyethylene glycol diacrylate
As shown in fig. 1, the pure acryloylmorpholine solidified product is placed under the condition of room temperature, and absorbs water firstly and then loses water, so that the water retention performance is poor; after the glycerol is added, the solidified products of the acryloylmorpholine/glycerol and the acryloylmorpholine/glycerol/polyethylene glycol diacrylate have no obvious water loss phenomenon, which shows that the solidified products have good water absorption/water retention characteristics.
For the acryloylmorpholine/glycerol cured article, the acryloylmorpholine/glycerol cured article was not fully recovered after stretching due to lack of sufficient chemical crosslinking points (as in fig. 2 a); the introduction of polyethylene glycol diacrylate increases the chemical cross-linking (covalent cross-linking points) of the acryloylmorpholine. Sufficient covalent crosslinking points ensure that the crosslinked network of the acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured article is not broken under stretching, so that the acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured article can rebound completely (see fig. 2 b). Thus, for the cyclic load-unload force test of the acryloylmorpholine/glycerol cured article, the residual strain of the acryloylmorpholine/glycerol cured article gradually increased, the maximum stress significantly decreased, indicating poor resilience (as in fig. 3 a); for the acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured article, the subsequent stress-strain curve area was essentially unchanged after two cycles of cyclic loading-unloading force testing, indicating that the acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured article had excellent resilience and fatigue resistance (as in fig. 3 b).
Since the acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured product has excellent resilience, the cured product can be used as a strain sensor. The resistance of the acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured product changed regularly under different strains and responded repeatedly, indicating potential sensing performance (as shown in fig. 4).
Finally, the 3D printed acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured product has structural design, and the ring with the hole structure can be prepared to be directly worn on the finger. The bending motion of the finger caused the regular change in resistance of the acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured article and repeated responses, indicating that the 3D printed acryloylmorpholine/glycerol/polyethylene glycol diacrylate cured article could be used as a potential wearable organic hydrogel strain sensor (see fig. 5).
The invention has been described in detail hereinabove with reference to specific exemplary embodiments thereof. It will be understood that various modifications and changes may be made without departing from the scope of the invention as defined by the appended claims. The detailed description and drawings are to be regarded in an illustrative rather than a restrictive sense, and if any such modifications and variations are desired to be included within the scope of the invention described herein. Furthermore, the background art is intended to illustrate the status and meaning of the development of the technology and is not intended to limit the invention or the application and field of application of the invention.
More specifically, although exemplary embodiments of the present invention have been described herein, the present invention is not limited to these embodiments, but includes any and all embodiments that have been modified, omitted, e.g., combined, adapted, and/or substituted between the various embodiments, as would be recognized by those skilled in the art in light of the foregoing detailed description. The limitations in the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the foregoing detailed description or during the prosecution of the application, which examples are to be construed as non-exclusive. Any steps recited in any method or process claims may be executed in any order and are not limited to the order presented in the claims. The scope of the invention should, therefore, be determined only by the appended claims and their legal equivalents, rather than by the descriptions and examples given above.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, definitions, will control. Where a molar amount, mass, concentration, temperature, time, volume, or other value or parameter is expressed as a range, preferred range, or a range bounded by a list of upper preferable values and lower preferable values, this is to be understood as specifically disclosing all ranges formed from any pair of any upper range limit or preferred value and any lower range limit or preferred value, regardless of whether ranges are separately disclosed. For example, a range of 1-50 should be understood to include any number, combination of numbers, or subranges of numbers selected from 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, as well as all fractional values between the integers described above, such as 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, and 1.9. Regarding sub-ranges, specifically considered are "nested sub-ranges" that extend from any end point within the range. For example, the nested subranges of exemplary ranges 1-50 can include 1-10, 1-20, 1-30, and 1-40 in one direction, or 50-40, 50-30, 50-20, and 50-10 in another direction.
Claims (10)
1. The photocuring slurry for the high-elasticity wearable strain sensor is characterized by comprising a monomer, a water-retaining agent, a chemical crosslinking agent, a photoinitiator and an ion-conducting filler, wherein the monomer is acryloylmorpholine, and the chemical crosslinking agent is polyethylene glycol diacrylate.
2. The photocurable slurry for a high-elasticity wearable strain sensor according to claim 1, wherein the contents of the monomer, the water-retaining agent, the chemical crosslinking agent, the photoinitiator and the ion-conducting filler are respectively as follows:
3. the photocurable slurry for a high-elasticity wearable strain sensor according to claim 1, wherein the water-retaining agent is one or more of glycerin, ethylene glycol, and propylene glycol.
4. A photocurable paste for a highly elastic wearable strain sensor according to claim 1, characterized in that the photoinitiator is phenyl bis (2, 4, 6-trimethylbenzoyl) phosphine oxide; and/or, characterized in that the ion-conducting filler is sodium chloride.
5. An organic hydrogel applicable to a high-elasticity wearable strain sensor, which is characterized in that the organic hydrogel is prepared from a photo-curing paste applicable to the high-elasticity wearable strain sensor, wherein the photo-curing paste applicable to the high-elasticity wearable strain sensor is the photo-curing paste of any one of claims 1 to 4.
6. A method for preparing an organic hydrogel for a high-elasticity wearable strain sensor, which is characterized in that the organic hydrogel for the high-elasticity wearable strain sensor is the organic hydrogel according to claim 6, and the preparation method comprises the following steps:
s1, mixing a monomer, a photoinitiator, an ion-conducting filler and a grinding aid, and performing first-stage ball milling after mixing to obtain monomer slurry; adding a water-retaining agent and a chemical cross-linking agent into the monomer slurry after the first-stage ball milling is finished, and then performing the second-stage ball milling, and filtering a grinding aid through the second-stage ball milling to prepare a photo-curing slurry;
s2, carrying out ultraviolet light curing molding on the photo-curing slurry;
s3, performing ultraviolet light curing and forming, and then performing water absorption to prepare the organic hydrogel for the high-elasticity wearable strain sensor.
7. The method for preparing an organic hydrogel for a high-elasticity wearable strain sensor according to claim 6, wherein S1 is prepared by placing the photo-curing paste in a dry environment to prevent the photo-curing paste from absorbing water.
8. The method for preparing the organic hydrogel for the high-elasticity wearable strain sensor according to claim 6, wherein the ultraviolet light in S2 has the wavelength of 405nm, the layer thickness of 2-100 μm and the ultraviolet light intensity of 2-30mW/cm 2 The exposure time is 0.1-20s; and/or, the water absorption environment in the S3 is as follows: temperature: 22-27 ℃, humidity: 40-65%, and water absorption for 12-720h.
9. A strain sensor prepared from the organic hydrogel of claim 5.
10. An application of an organic hydrogel for a high-elasticity wearable strain sensor, which is characterized in that the organic hydrogel is used as a material of the strain sensor.
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