CN113527558B - Nanocomposite hydrogel and preparation method and application thereof - Google Patents
Nanocomposite hydrogel and preparation method and application thereof Download PDFInfo
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- 239000002131 composite material Substances 0.000 claims abstract description 3
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- 239000000178 monomer Substances 0.000 claims description 33
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
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- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical group CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 12
- KWIUHFFTVRNATP-UHFFFAOYSA-O N,N,N-trimethylglycinium Chemical compound C[N+](C)(C)CC(O)=O KWIUHFFTVRNATP-UHFFFAOYSA-O 0.000 claims description 12
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- 239000000243 solution Substances 0.000 claims description 12
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- 229910019142 PO4 Inorganic materials 0.000 claims description 4
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- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
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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
- C08F120/00—Homopolymers 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
- C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F120/10—Esters
- C08F120/38—Esters containing sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
-
- 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
- C08K3/346—Clay
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N1/00—Electrostatic generators or motors using a solid moving electrostatic charge carrier
- H02N1/04—Friction generators
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/04—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
- C08J2333/14—Characterised by the use of homopolymers or 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 of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
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Abstract
The application discloses a nano composite hydrogel, a preparation method and application thereof, wherein the nano composite hydrogel is a zwitterionic/clay composite hydrogel, the tensile strength of the nano composite hydrogel is not less than 90KPa, and the elongation at break is not less than 1200%. The zwitterionic nano-composite hydrogel can be strongly adhered to the surfaces of various materials through the ion-dipole interaction and dipole-dipole interaction of the zwitterions and the surfaces of the materials, and the method is simple in process and low in raw material cost.
Description
Technical Field
The application relates to a nanocomposite hydrogel, a hydrogel bonding trigger electric appliance, and a preparation method and application thereof, and belongs to the field of high polymer hydrogels.
Background
Over the last 50 years, electronic devices have made tremendous progress. The rapid progress thoroughly changes the life of people in the fields of medical care, communication, entertainment, transportation and the like. In the near future, electronic devices will be seamlessly integrated into the human body, playing a key role in health monitoring, medical, robotic or artificial skin, and human-machine interfaces, penetrating deeper into human life. Materials capable of mimicking human skin are very popular because of their ability to effectively integrate and establish intimate contact with the human body. The human skin is soft, healable, stretchable, self-renewable, and can detect external environmental stimuli such as temperature and pressure. However, the electronic devices currently in use are rigid and fragile, resulting in difficulties in seamless connection and direct integration onto the human body. Conventional materials used in electronic devices (e.g., metals and semiconductors) can withstand less than 5% of mechanical strain and are not suitable for human mechanical movement. In addition, there is currently increasing interest in conformal wearable devices and human implantable electronic devices for advanced real-time health monitoring, medical therapy, sports applications and communications. These demands trigger the development of new and useful electronic materials and devices, and how to provide safer, more convenient, and sustained energy sources for devices is a problem to be solved.
The Wang Zhonglin institution's subject group reported triboelectric nano-generators (Triboelectric Nanogenerator, TENG) for the first time, which have been the focus of attention because of their light weight, high safety, cleanliness, environmental protection, and sustainability. Over the past few years, extensive attempts have been made to understand its rationale, improve its performance and expand its use in a wide range of applications. TENG has higher output voltage and power density, very low cost, high conversion efficiency and lower manufacturing cost than other energy harvesters. In addition, it can generate energy from a variety of random, irregular, and extremely low mechanical pulses. It can also operate at low and high frequencies, thus making it more suitable for generating energy from human voluntary movements, a very good energy harvesting device. For example, TENG has been demonstrated to generate energy by a gentle touch, heavy mechanical shock (e.g., tapping or walking), linear sliding (e.g., rubbing two body parts). TENG includes two-layer electrification layer, stretchable conductor layer and wire, stretchable conductor layer's plane size is less than electrification layer, two-layer electrification layer is usually pasted respectively through the viscose in stretchable conductor layer's tow sides, the wire is fixed in two-layer between the electrification layer, because the viscose easily loses the viscidity in the use repeatedly, can lead to stretchable conductor layer and electrification layer unable close contact, can influence TENG's power generation effect.
Disclosure of Invention
According to a first aspect of the present application, there is provided a nanocomposite hydrogel in which clay is combined with zwitterionic positively charged groups by electrostatic interactions, providing excellent mechanical properties to the hydrogel, and in which charged groups on the zwitterionic polymer chains can interact repeatedly with polar groups on the tissue surface via dipole-dipole interactions, facilitating tight bonding of the hydrogel to the charged layer surface of the generator, and still providing good power generation performance after multiple beats or other mechanical impacts.
A nanocomposite hydrogel, the nanocomposite hydrogel being a zwitterionic/clay composite hydrogel, the nanocomposite hydrogel having a tensile strength of not less than 90KPa and an elongation at break of not less than 1200%.
Optionally, the tensile strength of the nano composite hydrogel is 90-130 KPa, and the elongation at break is 1200-1700%.
Optionally, the clay is a nanoclay; the nano clay is at least one selected from magnesium lithium silicate, magnesium aluminum silicate and water-based bentonite;
optionally, the zwitterionic monomer is selected from at least one of carboxylate betaine type zwitterionic monomer (CBAA), sulfonate betaine type zwitterionic monomer (SBMA) and phosphate betaine type zwitterionic monomer;
optionally, the mass ratio of the clay to the zwitterionic monomer is 0.012 to 0.08.
The preparation method of the nano composite hydrogel at least comprises the following steps:
adding an initiator into the clay water suspension dissolved with the zwitterionic monomer to obtain a mixed solution;
and adding an accelerator into the mixed solution to obtain gel prepolymerization solution, and obtaining the nano composite hydrogel through in-situ free radical polymerization.
Optionally, the clay is a nanoclay; the nano clay is at least one selected from magnesium lithium silicate, magnesium aluminum silicate and water-based bentonite;
the concentration of clay in the mixed solution is 1-7wt/vol%.
Alternatively, the upper limit of the clay concentration may be selected from 1.5wt/vol%, 2wt/vol%, 2.5wt/vol%, 3wt/vol%, 3.5wt/vol%, 4wt/vol%, 4.5wt/vol%, 5wt/vol%, 5.5wt/vol%, 6wt/vol%, 6.5wt/vol% or 7wt/vol%; the lower limit may be selected from 1wt/vol%, 1.5wt/vol%, 2wt/vol%, 2.5wt/vol%, 3wt/vol%, 3.5wt/vol%, 4wt/vol%, 4.5wt/vol%, 5wt/vol%, 5.5wt/vol%, 6wt/vol% or 6.5wt/vol%.
Optionally, the zwitterionic monomer is selected from at least one of carboxylate betaine type zwitterionic monomer (CBAA), sulfonate betaine type zwitterionic monomer (SBMA), phosphate betaine type zwitterionic monomer;
optionally, the concentration of the zwitterionic monomer in the mixed solution is 3-5 mol/L.
Optionally, the initiator is a water-soluble radical polymerization initiator;
the water-soluble free radical polymerization initiator is at least one selected from potassium persulfate, ammonium persulfate and sodium persulfate;
the accelerator is tetramethyl ethylenediamine TEMED.
Optionally, the concentration of the initiator in the mixed solution is 0.001-0.003 mol/L;
the dosage of the accelerator is 3.6-5 mu L/mL.
Optionally, the in-situ free radical polymerization is carried out at room temperature for 10 to 15 hours.
According to a second aspect of the present application, there is provided a nanocomposite hydrogel prepared by any one of the methods of preparation described above.
According to a third aspect of the present application, there is provided a hydrogel triggering device comprising a wire, two electrification layers and a conductor layer fixed between the two electrification layers, wherein the conductor layer is selected from at least one of the nanocomposite hydrogel prepared by any one of the preparation methods described above and the nanocomposite hydrogel described in any one of the preparation methods described above.
Optionally, the electrification layer is selected from at least one of foam double-sided tape (VHB), polydimethylsiloxane (PDMS) and Silicone Rubber (Silicone Rubber);
optionally, the wires are conventional wires, preferably copper wires.
Preferably, the conductor layer and the electrification layer are fixed through self adhesion.
Optionally, the tensile strength of the hydraulic bonding trigger is not less than 120KPa, and the elongation at break is not less than 1400%; the transparency of the hydrogel triggering device is not less than 80%.
Optionally, the tensile strength of the hydraulic gel bonding trigger is 120-170 KPa, and the elongation at break is 1400-2400%.
Optionally, the short-circuit current of the hydraulic gel trigger electric appliance is 3-10 mu A.
In a specific embodiment, a method for preparing a hydrogel trigger device is provided, including:
(1) Preparing a uniform aqueous suspension of clay at room temperature, adding a zwitterionic monomer into the suspension, and stirring at room temperature until the zwitterionic monomer is completely dissolved to obtain a mixed solution of the zwitterionic monomer and the clay.
The contents of the substances in the mixed solution are as follows:
nanoclay 1-7 wt/vol%
Clay 4mol/L
The balance being water;
(2) And adding an initiator into the obtained mixed solution of the amphoteric ions and the clay, stirring for 30-60 min at room temperature, adding TEMED into the mixed solution after uniformly mixing, stirring for 5min at room temperature to obtain gel prepolymer, injecting the gel prepolymer into a gel forming mold, and polymerizing in air for 12h at room temperature to obtain the amphoteric ion nanocomposite hydrogel.
(3) And adhering electrification layers on two sides of the obtained amphoteric ion nano composite hydrogel, and inserting a copper wire between the two electrification layers to finally obtain the single-level TENG.
The optional electrification layer is selected from at least one of VHB, PDMS and Silicone Rubber.
As an embodiment, the specific steps are:
dispersing the nano clay in deionized water at room temperature, uniformly mixing to obtain nano clay suspension, adding the amphoteric ions into the dispersed nano clay suspension, and stirring for about 1h at room temperature to obtain a transparent mixed solution of the amphoteric ions and the clay, wherein:
nanoclay 1-7 wt/vol%
Zwitterionic 4mol/L
The balance of deionized water;
the nano clay is one or more of lithium magnesium silicate, magnesium aluminum silicate or water bentonite.
(2) Adding 0.002mol/L initiator into the obtained mixed solution, stirring for 30-60 min at room temperature, mixing uniformly, adding 3.6-5 mu L/mLTEMED into the mixed solution, stirring for 5min at room temperature, mixing uniformly to obtain gel pre-polymerization solution, injecting the gel pre-polymerization solution into a gel forming mold, and polymerizing in air for 12h at room temperature to obtain the hydrogel.
Optionally, the amphoteric ion is selected from at least one of carboxylate betaine type amphoteric ion monomer (CBMA), sulfonate betaine type amphoteric ion monomer (SBMA) and phosphate betaine type amphoteric ion monomer.
The water-soluble initiator comprises at least one of potassium persulfate, ammonium persulfate and sodium persulfate.
(3) And (3) adhering electrification layers on two sides of the obtained amphoteric ion nano composite hydrogel, and inserting a copper wire in the middle to finally obtain the single-level TENG.
The optional electrification layer is selected from at least one of VHB, PDMS and Silicone Rubber.
According to a fourth aspect of the present application, there is provided the use of at least one of a nanocomposite hydrogel prepared by the method of any one of the above, a nanocomposite hydrogel of any one of the above, and a hydrogel trigger device of any one of the above in a wearable device.
The wearable device may be a wearable bioenergy collector, optionally with flexible electronics such as a flexible input.
"wt/vol%" in this application is mass volume percent; for example, "1wt/vol%" is the dissolution of 1g solute in 100mL of water. Room temperature is 20-25 ℃.
The beneficial effects that this application can produce include:
1) The clay and the zwitter ion positively charged groups in the nano composite hydrogel are combined through electrostatic action, so that excellent mechanical properties are provided for the hydrogel, and the charged groups on the zwitter ion polymer chains can be repeatedly interacted with the polar groups on the tissue surface through dipole-dipole interaction, so that the tight combination of the hydrogel and the surface of the electrification layer of the generator is facilitated, and the hydrogel still has excellent power generation performance after being subjected to beating or other mechanical impact for many times;
2) The hydrogel finally obtained contains a proper amount of phenolic hydroxyl groups which can be repeatedly bonded with the surfaces of skin, tissues and the like through hydrogen bonding action and the like, so that repeated and stable adhesion capacity is obtained;
3) The hydrogel preparation method provided by the application is simple in process and low in raw material cost;
4) The hydrogel has good biocompatibility and can be used as a wearable bioenergy collector, a wearable flexible input end and other flexible electronic device materials.
Drawings
FIG. 1 is a stress-strain curve of a nanocomposite hydrogel prepared according to example 4 of the present invention;
FIG. 2 is a graph showing stress-strain curves of a nanocomposite hydrogel trigger device prepared in example 4 of the present invention;
fig. 3 is a transparency map of the nanocomposite hydrogel trigger electrical apparatus prepared in example 1 of the present invention.
Detailed Description
Unless otherwise indicated, all starting materials in the examples of the present application were purchased commercially.
Wherein: the nano clay is named as (magnesium lithium silicate) LAPONITE XLG, (magnesium aluminum silicate) Neusilin UFL2, (aqueous bentonite) BP-188L.
Sulfobetaine methacrylate (SBMA) was purchased from ala Ding Huaxue reagent company model M164461.
VBH double sided tape was purchased from 3M company model 4905 and PDMS was prepared according to the method described in the document "Transparent and attachable ionic communicators based on self-cleanable triboelectric nanogenerators" published by Younghonon Lee.
The analytical method in the examples of the present application is as follows:
and (3) testing the mechanical properties of the nano composite hydraulic gel trigger electric appliance by using a universal testing machine (Sansi).
The transparency test of the nanocomposite hydrogel trigger electrical apparatus was performed using an ultraviolet visible near infrared spectrophotometer (LAMBDA).
And adopting a Ji Shi Li 6514 electrometer to test the power generation performance of the nano composite hydraulic gel trigger electric appliance.
Example 1
Uniformly dispersing the nano clay in deionized water to obtain nano clay suspension, adding the zwitterionic monomer SBMA into the dispersed nano clay suspension, and stirring for 1h at room temperature to obtain a transparent and clear mixed solution of the amphoteric ion and the nano clay.
The contents of all substances in the mixed solution are as follows:
5wt/vol% of lithium magnesium silicate
Zwitterionic monomer 4mol/L
The balance of deionized water;
(2) Adding potassium persulfate into the obtained mixed solution of the nanoclay and the zwitterionic monomer, stirring for 30min at room temperature, uniformly mixing to obtain mixed solution, wherein the concentration of the potassium persulfate in the mixed solution is 0.002mol/L, adding TEMED into the mixed solution, the concentration of the TEMED in the mixed solution is 3.6 mu L/mL, stirring for 5min at room temperature, uniformly mixing to obtain gel prepolymer, injecting the gel prepolymer into a gel forming mold, and polymerizing for 12h in free radical in room temperature air to obtain the zwitterionic nanocomposite hydrogel with 20mm x 2mm x 20 mm.
(3) And (3) adhering transparent VHB double-sided adhesive tapes with the thickness of 30mm and 30mm on two sides of the obtained zwitterionic nano composite hydrogel, inserting a copper wire between the two layers of VHB double-sided adhesive tapes, and finally obtaining the single-electric-level nano composite hydrogel trigger electric appliance TENG.
Example 2
Uniformly dispersing the nano clay in deionized water to obtain nano clay suspension, adding the zwitterionic monomer SBMA into the dispersed nano clay suspension, and stirring for 1h at room temperature to obtain transparent and clear mixed solution of the amphoteric ion and the nano clay.
The contents of all substances in the mixed solution are as follows:
lithium magnesium silicate 4wt/vol%
Zwitterionic monomer 4mol/L
The balance of deionized water;
(2) Adding potassium persulfate into the obtained mixed solution of the nanoclay and the zwitterionic monomer, stirring for 60min at room temperature, uniformly mixing to obtain a mixed solution, wherein the concentration of the potassium persulfate in the mixed solution is 0.002mol/L, adding TEMED into the mixed solution, the concentration of the TEMED in the mixed solution is 3.6 mu L/mL, stirring for 5min at room temperature, uniformly mixing to obtain a gel prepolymer solution, injecting the gel prepolymer solution into a gel forming mold, and polymerizing for 12h in the air at room temperature to obtain the amphoteric ionic nanocomposite hydrogel with 20mm x 2mm x 20 mm.
(3) And (3) adhering transparent VHB double-sided adhesive tapes with the thickness of 30mm and 30mm on two sides of the obtained zwitterionic nano composite hydrogel, inserting a copper wire between the two layers of VHB double-sided adhesive tapes, and finally obtaining the single-electric-level nano composite hydrogel trigger electric appliance TENG.
Example 3
Uniformly dispersing the nano clay in deionized water to obtain nano clay suspension, adding the zwitterionic monomer SBMA into the dispersed nano clay suspension, and stirring for 1h at room temperature to obtain transparent and clear mixed solution of the amphoteric ion and the nano clay.
The contents of all substances in the mixed solution are as follows:
6wt/vol% of lithium magnesium silicate
Zwitterionic monomer 4mol/L
The balance of deionized water;
(2) Adding potassium persulfate into the obtained mixed solution of the nanoclay and the zwitterion, stirring for 60min at room temperature, uniformly mixing to obtain a mixed solution, wherein the concentration of the potassium persulfate in the mixed solution is 0.002mol/L, adding TEMED into the mixed solution, the concentration of the TEMED in the mixed solution is 3.6 mu L/mL, stirring for 5min at room temperature, uniformly mixing to obtain a gel prepolymer solution, injecting the gel prepolymer solution into a gel forming mold, and polymerizing for 12h in the air at room temperature to obtain the zwitterion nanocomposite hydrogel with 20mm x 2mm x 20 mm.
(3) And (3) adhering transparent VHB double-sided adhesive tapes with the thickness of 30mm and 30mm on two sides of the obtained zwitterionic nano composite hydrogel, inserting a copper wire between the two layers of VHB double-sided adhesive tapes, and finally obtaining the single-electric-level nano composite hydrogel trigger electric appliance TENG.
Example 4
Uniformly dispersing the nano clay in deionized water to obtain nano clay suspension, adding the zwitterionic monomer SBMA into the dispersed nano clay suspension, and stirring for 1h at room temperature to obtain transparent and clear mixed solution of the amphoteric ion and the nano clay.
The contents of all substances in the mixed solution are as follows:
2wt/vol% of lithium magnesium silicate
Zwitterionic monomer 4mol/L
The balance of deionized water;
(2) Adding potassium persulfate into the obtained mixed solution of the nanoclay and the zwitterion, stirring for 60min at room temperature, uniformly mixing to obtain a mixed solution, wherein the concentration of the potassium persulfate in the mixed solution is 0.002mol/L, adding TEMED into the mixed solution, the concentration of the TEMED in the mixed solution is 3.6 mu L/mL, stirring for 5min at room temperature, uniformly mixing to obtain a gel prepolymer solution, injecting the gel prepolymer solution into a gel forming mold, and polymerizing for 12h in the air at room temperature to obtain the zwitterion nanocomposite hydrogel with 20mm x 2mm x 20 mm.
(3) And (3) adhering transparent VHB double-sided adhesive tapes with the thickness of 30mm and 30mm on two sides of the obtained zwitterionic nano composite hydrogel, inserting a copper wire between the two layers of VHB double-sided adhesive tapes, and finally obtaining the single-electric-level nano composite hydrogel trigger electric appliance TENG.
Example 5
The preparation method is the same as in example 3, except that the magnesium lithium silicate is replaced by magnesium aluminum silicate, and the content of the magnesium aluminum silicate is 4wt/vol% of the prepolymer.
The resulting nanocomposite hydrogel trigger devices were similar to those in example 1.
Example 6
The preparation method is the same as in example 1, except that the lithium magnesium silicate is replaced by aqueous bentonite, and the content of the aqueous bentonite is 3wt/vol% of the prepolymer.
The resulting nanocomposite hydrogel trigger devices were similar to those in example 1.
Example 7
The preparation method is the same as in example 1, except that the VHB double sided tape is replaced with PDMS.
The resulting nanocomposite hydrogel trigger devices were similar to those in example 1.
Example 8
The preparation method is the same as in example 1, except that the VHB double-sided adhesive tape is replaced by a Silicone Rubber.
The resulting nanocomposite hydrogel trigger devices were similar to those in example 1.
Adhesion performance test on nanocomposite hydrogels provided in examples 1-8 step 2)
The adhesion performance of the nanocomposite hydrogel on the surfaces of glass, cu sheets, polytetrafluoroethylene and pigskin materials is measured by using a universal testing machine and adopting a lap shear test, and is represented by the typical nanocomposite hydrogel provided in example 4, the adhesion strength of the nanocomposite hydrogel provided in example 4 on the surfaces of the pigskin is 11.93kPa, which indicates that the nanocomposite hydrogel has good self-adhesion performance with other materials, and the adhesion strengths of other examples are all in the range of 6-10 kPa.
Performance testing was performed on nanocomposite hydrogel contact trigger devices provided in examples 1 to 8 and nanocomposite hydrogels provided in step 2):
1) Mechanical property test
Using a universal testing machine, measuring the mechanical properties of the nano composite hydrogel and the nano composite hydrogel bonding trigger by adopting a tensile test, wherein the nano composite hydrogel provided in the example 4 is represented by a typical example, as shown in fig. 1, the tensile stress of the nano composite hydrogel provided in the example 4 is 90kPa, the elongation at break is 1250%, the tensile stress of other examples is 90-130 kPa, and the elongation at break is 1200-1700%; as shown in FIG. 2, the tensile stress of the nano composite hydrogel trigger is 120kPa, the elongation at break is 2400%, the tensile stress of other embodiments is 120-170 kPa, and the elongation at break is 1400% -2400%.
2) Transparency test
The transparency of the nanocomposite hydrogel trigger was tested using a transmission mode using an ultraviolet-visible near-infrared spectrophotometer, and represented by the nanocomposite hydrogel provided in example 4, as shown in fig. 3, the transparency of the nanocomposite hydrogel provided in example 4 was about 80%, and the transparency of the other examples was 80% or more.
3) Power generation performance test
The testing method comprises the following steps: the nanocomposite hydrogel trigger TENG was tested for short-circuit current using a gemini electrometer 6514. One end of a measuring wire of the electrometer 6514 is connected to a Cu wire of the nano composite hydrogel trigger electric device TENG, the other end of the measuring wire is grounded, and the nano composite hydrogel trigger electric device TENG is continuously beaten by hands to test;
the nanocomposite hydrogel provided in example 4 is typically represented by the graph shown in FIG. 1, and the short-circuit current of the nanocomposite hydrogel provided in example 4 is about 5. Mu.A, and the short-circuit current of the other examples is 3 to 10. Mu.A.
As can be seen from fig. 1 and fig. 2, the nanocomposite hydrogel bonding trigger electrical apparatus provided in embodiments 1 to 7 of the present invention has good mechanical properties, can withstand large deformation, and can be applied in various situations, such as elbow joint and knee joint; and the transparency is high, so that the contact generator can be used as a wearable device on the skin surface of a human body.
The foregoing description is only a few examples of the present application and is not intended to limit the present application in any way, and although the present application is disclosed in the preferred examples, it is not intended to limit the present application, and any person skilled in the art may make some changes or modifications to the disclosed technology without departing from the scope of the technical solution of the present application, and the technical solution is equivalent to the equivalent embodiments.
Claims (8)
1. A hydrogel bonding trigger electric appliance comprises a lead, two electrification layers and a conductor layer fixed between the two electrification layers, and is characterized in that the conductor layer is nano composite hydrogel; the nano composite hydrogel is a zwitterionic/clay composite hydrogel, the tensile strength of the nano composite hydrogel is not less than 90KPa, and the elongation at break is not less than 1200%; the conductor layer and the electrification layer are fixed through self-adhesion;
the preparation method of the nano composite hydrogel at least comprises the following steps:
adding an initiator into the clay water suspension dissolved with the zwitterionic monomer to obtain a mixed solution;
adding an accelerator into the mixed solution to obtain gel prepolymerization solution, and obtaining nano composite hydrogel through in-situ free radical polymerization;
the zwitterionic monomer is selected from at least one of carboxylate betaine type zwitterionic monomer, sulfonate betaine type zwitterionic monomer and phosphate betaine type zwitterionic monomer;
the concentration of the zwitterionic monomer in the mixed solution is 3-5 mol/L;
the clay is a nanoclay.
2. The hydrogel trigger of claim 1, wherein the nanoclay is selected from at least one of lithium magnesium silicate, magnesium aluminum silicate, and aqueous bentonite;
the concentration of clay in the mixed solution is 1-7wt/vol%; wt/vol% is the mass volume percentage, 1wt/vol% is 1g solute dissolved in 100mL water.
3. The hydrogel trigger of claim 1, wherein the initiator is a water-soluble free radical polymerization initiator;
the water-soluble free radical polymerization initiator is at least one selected from potassium persulfate, ammonium persulfate and sodium persulfate;
the accelerator is tetramethyl ethylenediamine.
4. The hydraulic bond trigger electrical apparatus according to claim 1, wherein the concentration of the initiator in the mixed solution is 0.001 to 0.003mol/L;
the dosage of the accelerator is 3.6-5 mu L/mL.
5. The hydrogel contact trigger of claim 1, wherein the in situ radical polymerization is performed at room temperature.
6. The hydrogel trigger electrical apparatus of claim 1, wherein the electrification layer is selected from at least one of foam double sided tape, polydimethylsiloxane, and silicone.
7. The hydrogel trigger electrical apparatus of claim 1, wherein the hydrogel trigger electrical apparatus has a transparency of not less than 80%.
8. Use of at least one of the hydrogel triggering appliances of any one of claims 1-7 in a wearable device.
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