CN113831553B - Preparation method and application of PVDF-TrFE chitosan hydrogel - Google Patents
Preparation method and application of PVDF-TrFE chitosan hydrogel Download PDFInfo
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- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 claims description 27
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 24
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- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
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- 238000001514 detection method Methods 0.000 claims description 4
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/16—Measuring force or stress, in general using properties of piezoelectric devices
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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Abstract
The invention relates to the field of preparation of piezoelectric piezoresistive composite flexible sensors, in particular to a preparation method and application of PVDF-TrFE chitosan hydrogel, which are prepared by taking PEDOT: PSS as conductive filler, taking PVDF-TrFE as piezoelectric material, taking crosslinked chitosan quaternary ammonium salt solution with good biocompatibility as a flexible network skeleton, and performing thermal gel molding. The preparation process is simple and convenient, the cost is low, the prepared hydrogel also has certain mechanical strength and strain sensing performance, simultaneously has a piezoelectric effect and a piezoresistive effect, can detect static force and dynamic force at the same time, can realize interconversion, and provides a new thought for constructing stretchable and high-sensitivity strain sensing conductive hydrogel.
Description
Technical Field
The invention relates to the field of preparation of piezoelectric piezoresistive composite flexible sensors, in particular to a preparation method and application of PVDF-TrFE chitosan hydrogel.
Background
Existing flexible strain sensors are mainly divided into piezoelectric type and piezoresistive type. The piezoelectric sensor has a fast response time and is suitable for detecting dynamic signals, such as transient force change, deformation speed and the like, but the piezoelectric sensing signal cannot reflect the final stress state and strain state of an object. The advantage of the piezoresistive sensor is often realized in the detection of static force, and the stress state and the deformation state of an object are detected in real time according to the magnitude of a current value. However, the piezoresistive sensor also has the defects of being incapable of sensing the stress direction and the bending strain direction of the object, insensitive to the strain rate of the object and the like. Based on this, in order to obtain a strain sensor with high sensitivity, it is extremely necessary to develop a piezoelectric piezoresistive composite sensing material with a unique structure and high sensitivity.
The piezoresistive sensor is distinguished mainly by various conductive fillers, so that the research on the piezoresistive sensor is very perfect, and high response can be achieved, but the piezoresistive sensor is difficult to continue to work under the conditions of detecting dynamic force and lacking an external power supply. While the design of piezoelectric sensors can end up with this challenge.
Since the first report of the strong piezoelectric activity of the ferroelectric polymer polyvinylidene fluoride (PVDF) by japanese scholars, PVDF has become the material of choice for flexible piezoelectric sensors. Studies have shown that after addition of trifluoroethylene (TrFE) to polyvinylidene fluoride (PVDF), formation of the beta-piezoelectric phase can be promoted due to steric effects. It is further noted that PVDF-TrFE forms mainly the beta phase under different shaping processes. Based on this feature, PVDF-TrFE has received much attention as a typical piezoelectric material.
The currently most widespread method of preparation of electrically conductive hydrogels is to dope or mix the electron-conducting components directly into the hydrogel matrix. However, simple mixing methods often result in heterogeneous separation or aggregation of the conductive filler, resulting in reduced performance. Therefore, the rational design of the conductive hydrogel structure is particularly important.
The preparation difficulty of the piezoelectric-piezoresistive dual-mode composite sensor core layer is how to disperse a PVDF-TrFE piezoelectric phase in a hydrogel system, and because of the unique property of PVDF-TrFE, the PVDF-TrFE is directly added into the hydrogel system to cause the condition that the PVDF-TrFE cannot be dissolved frequently, so that the PVDF-TrFE is completely dissolved by DMSO, and the distribution of the PVDF-TrFE disperse phase is optimized through the dipole action between the PVDF-TrFE and a chitosan quaternary ammonium salt chain, so that the synergistic effect of the piezoelectric effect and the piezoresistive effect is achieved, and the strain sensing performance of the hydrogel sensor is further improved.
Disclosure of Invention
The invention discloses a preparation method and application of PVDF-TrFE chitosan hydrogel, which are used for solving the problems, and the preparation method is simple and convenient in preparation process and low in cost, and the prepared hydrogel also has certain mechanical strength and strain sensing performance, simultaneously has a piezoelectric effect and a piezoresistive effect, can detect static force and dynamic force at the same time, can realize interconversion, and provides a new thought for constructing stretchable and high-sensitivity strain sensing conductive hydrogel.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a preparation method of PVDF-TrFE chitosan hydrogel comprises the following steps:
s1) preparing PVDF-TrFE/cross-linked chitosan quaternary ammonium salt concentrated solution
S101), preparing PEDOT (sodium dodecyl sulfate)/chitosan quaternary ammonium salt aqueous solution: adding PEDOT PSS conductive liquid and deionized water into a beaker, then adding chitosan quaternary ammonium salt, stirring for 5min, and standing for 24h to obtain PEDOT PSS/chitosan quaternary ammonium salt aqueous solution;
s102), preparing PEDOT (poly (styrene-co-butylene) PSS/crosslinked chitosan quaternary ammonium salt solution: adding epichlorohydrin into the PSS/chitosan quaternary ammonium salt aqueous solution of PEDOT in the step S101), stirring for 4 hours at constant temperature, continuously dropwise adding sodium hydroxide solution during the reaction period to maintain the pH of the reaction system at 10, naturally cooling the reaction system to room temperature after the reaction is finished, and regulating the pH value to 7 by using hydrochloric acid solution to obtain the PEDOT PSS/crosslinked chitosan quaternary ammonium salt solution;
s103), dialysis: pouring the PEDOT PSS/crosslinked chitosan quaternary ammonium salt solution in the step S102) into a dialysis bag, placing the dialysis bag into a beaker, measuring deionized water, adding the deionized water into the beaker, and dialyzing for 72 hours, wherein the deionized water is changed every 24 hours;
s104), preparing PVDF-TrFE solution: adding PVDF-TrFE into DMSO solution, stirring at room temperature for 30min, and performing ultrasonic treatment for 60min to ensure complete dissolution of PVDF-TrFE;
pouring the dialyzed PEDOT PSS/crosslinked chitosan quaternary ammonium salt solution in the step S103) into a beaker, then adding glycerol, adding the DMSO solution dissolved with PVDF-TrFE, concentrating in a water bath magnetic stirrer at the concentration temperature of 70 ℃ for 7 hours to obtain PVDF-TrFE crosslinked chitosan quaternary ammonium salt concentrated solution, pouring the PVDF-TrFE crosslinked chitosan quaternary ammonium salt concentrated solution into a glassware, standing and removing bubbles for standby;
s2), preparing PVDF-TrFE/chitosan quaternary ammonium salt hydrogel
S201), ultrasonic treatment: placing the beaker filled with the PVDF-TrFE crosslinked chitosan concentrated solution in the step S104) in a magnetic water bath kettle, stirring for 1h, and carrying out ultrasonic treatment for 1h to obtain blue-black PVDF-TrFE/chitosan quaternary ammonium salt hydrogel precursor liquid;
s202), pouring the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel precursor solution in the step S201) into a mould, and then performing thermal gel forming, wherein the thermal drying temperature is 70 ℃, and the forming time is 4 hours, so as to obtain PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
s3, detection, assay, analysis and characterization
Detecting, analyzing and characterizing the mechanical property and the strain sensing property of the prepared PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
carrying out mechanical property analysis by using a digital universal stretcher;
analyzing GF factors by a digital universal stretcher;
strain sensing performance analysis was performed with a Keithley MM6500 multimeter;
conclusion: the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel can realize the cooperation of piezoelectric-piezoresistive effects by adding PEDOT-PSS conductive liquid and PVDF-TrFE solution, and the obtained PVDF-TrFE/chitosan quaternary ammonium salt hydrogel has excellent strain sensing performance and can be used for preparing a stretchable high-sensitivity hydrogel strain sensor.
Preferably, in step S104), the concentration is performed to 20% of the original volume by using a water bath magnetic stirrer.
Preferably, the charging mass ratio of the chitosan quaternary ammonium salt to the PEDOT:PSS conductive liquid is 2:5, the feeding mass ratio of the sugar quaternary ammonium salt to the PVDF-TrFE solution is 2:0.1 to 0.5.
Preferably, the charging ratio of the chitosan quaternary ammonium salt to the PVDF-TrFE solution is 0.05-0.25:1.
the invention also provides application of the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel prepared by the preparation method of the PVDF-TrFE chitosan hydrogel as a strain sensor, wherein the application comprises the steps of placing two wires in a mold, pouring the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel into the mold, preparing a flexible sensor by a thermal drying molding mode, taking off a sensor spline from the mold after 8h of thermal drying at 70 ℃, and cutting to obtain the piezoelectric-piezoresistive composite flexible sensor.
Preferably, the size of the cutting is 60mm long, 1mm wide and 2mm high.
Preferably, the lead is a copper lead with a lead-out length of 30 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention takes DMSO as solvent to ultrasonically dissolve PVDF-TrFE-TrFE, and the solvent is PEDOT: the aqueous PSS solutions are physically mixed to form a conductive network. The preparation process is simple and convenient, the cost is low, the prepared hydrogel also has certain mechanical strength and strain sensing performance, simultaneously has a piezoelectric effect and a piezoresistive effect, can detect static force and dynamic force at the same time, can realize interconversion, and provides a new thought for constructing stretchable and high-sensitivity strain sensing conductive hydrogel.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic diagram of a preparation flow of a PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
FIG. 2 is the conductivity properties of PVDF-TrFE/chitosan quaternary ammonium salt hydrogels;
FIG. 3 is a stress-strain curve of PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
FIG. 4 is a GF factor analysis of PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
FIG. 5 is a graph showing the piezoresistive properties of PVDF-TrFE/chitosan quaternary ammonium salt hydrogels;
FIG. 6 is a graph showing the piezoelectric properties of PVDF-TrFE/chitosan quaternary ammonium salt hydrogels;
FIG. 7 is a graph showing the voltage signal and piezoresistive signal response of a PVDF-TrFE/chitosan quaternary ammonium salt hydrogel.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
In order to better understand the embodiments of the present application, the following description will clearly and completely describe the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
Example 1
Technical proposal
The chemical materials used are: the preparation method comprises the following steps of chitosan quaternary ammonium salt, epichlorohydrin, sodium hydroxide, hydrochloric acid, glycerol, PVDF-TrFE fibrous, PEDOT: PSS and deionized water, wherein the preparation dosage of the combination is as follows: in g, ml and cm 3 In units of measure
Chitosan quaternary ammonium salt: HACC solid 99.5% 2.0 g.+ -. 0.001g
Epichlorohydrin: c (C) 3 H 5 ClO liquid 99.5% 4 mL.+ -. 0.001mL
Sodium hydroxide: naOH solid 99.5% 5g + -0.001 g
Hydrochloric acid: HCl liquid 99.5% 23 mL.+ -. 0.001mL
Glycerol: c (C) 3 H 8 O 3 99.5% liquid 1 mL.+ -. 0.001mL
PVDF-TrFE fibrous 99.5% 100-500mg
PEDOT PSS liquid solid 99.5% 5ml
Deionized water: h 2 O liquid 99.99% 5000 mL.+ -. 50mL
As shown in fig. 1, a preparation method of the PVDF-TrFE chitosan hydrogel comprises the following steps:
s1) preparing PVDF-TrFE/cross-linked chitosan quaternary ammonium salt concentrated solution
S101), preparing PEDOT (sodium dodecyl sulfate)/chitosan quaternary ammonium salt aqueous solution: adding 5mL of PEDOT to PSS conductive liquid and 200mL of +/-0.001 mL of deionized water into a beaker, then adding 2.0g of +/-0.001 g of chitosan quaternary ammonium salt, stirring for 5min, and standing for 24h to obtain PEDOT to PSS/chitosan quaternary ammonium salt aqueous solution;
s102), preparing PEDOT (poly (styrene-co-butylene) PSS/crosslinked chitosan quaternary ammonium salt solution: adding 4.72g of epichlorohydrin into the PSS/chitosan quaternary ammonium salt aqueous solution of PEDOT in the step S101), stirring for 4 hours at constant temperature, continuously dropwise adding a sodium hydroxide solution during the reaction to maintain the pH of the reaction system at 10, naturally cooling to room temperature after the reaction is finished, and regulating the pH value to 7 by using 2 mL+/-0.001 mL of hydrochloric acid solution to obtain the PSS/crosslinked chitosan quaternary ammonium salt solution of PEDOT;
s103), dialysis: firstly pouring the PEDOT PSS/cross-linked chitosan quaternary ammonium salt solution in the step S102) into a dialysis bag, then placing the dialysis bag into a beaker, measuring 500 mL+/-0.001 mL of ionized water, adding the ionized water into the beaker, dialyzing for 72h, and changing deionized water every 24h in the process;
s104), preparing PVDF-TrFE solution: adding 100-500mgPVDF-TrFE into 25ml DMSO solution, stirring at room temperature for 30min, and performing ultrasonic treatment for 60min to ensure complete dissolution of PVDF-TrFE;
pouring 200mL of + -0.001mL PEDOT:PSS/crosslinked chitosan quaternary ammonium salt solution dialyzed in the step S103) into a beaker, then adding 1mL of glycerol, adding the DMSO solution dissolved with PVDF-TrFE, concentrating to 40mL in a water bath magnetic stirrer at a concentration temperature of 70 ℃ for 7 hours to obtain PVDF-TrFE crosslinked chitosan quaternary ammonium salt concentrated solution, and pouring the PVDF-TrFE crosslinked chitosan quaternary ammonium salt concentrated solution into a glassware for standing to remove bubbles for later use;
s2), preparing PVDF-TrFE/chitosan quaternary ammonium salt hydrogel
S201), ultrasonic treatment: placing the beaker filled with the PVDF-TrFE crosslinked chitosan concentrated solution in the step S104) in a magnetic water bath kettle, stirring for 1h, and carrying out ultrasonic treatment for 1h to obtain blue-black PVDF-TrFE/chitosan quaternary ammonium salt hydrogel precursor liquid;
s202), pouring the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel precursor solution in the step S201) into a mould, and then performing thermal gel forming, wherein the thermal drying temperature is 70 ℃, and the forming time is 4 hours, so as to obtain PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
s3, detection, assay, analysis and characterization
Detecting, analyzing and characterizing the mechanical property and the strain sensing property of the prepared PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
carrying out mechanical property analysis by using a digital universal stretcher;
analyzing GF factors by a digital universal stretcher;
strain sensing performance analysis was performed with a Keithley MM6500 multimeter;
conclusion: the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel can realize the cooperation of piezoelectric-piezoresistive effects by adding PEDOT-PSS conductive liquid and PVDF-TrFE solution, and the obtained PVDF-TrFE/chitosan quaternary ammonium salt hydrogel has excellent strain sensing performance and can be used for preparing a stretchable high-sensitivity hydrogel strain sensor.
In step S104), the mixture is concentrated to 20% of the original volume by using a water bath magnetic stirrer.
The charging mass ratio of the chitosan quaternary ammonium salt to the PEDOT to the PSS conductive liquid is 2:5, the feeding mass ratio of the sugar quaternary ammonium salt to the PVDF-TrFE solution is 2:0.1 to 0.5.
The charging ratio of the chitosan quaternary ammonium salt to the PVDF-TrFE solution is 0.05-0.25:1.
the invention also provides application of the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel prepared by the preparation method of the PVDF-TrFE chitosan hydrogel as a strain sensor, wherein the application comprises the steps of placing two wires in a mold, pouring the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel into the mold, preparing a flexible sensor by a thermal drying molding mode, taking off a sensor spline from the mold after 8h of thermal drying at 70 ℃, and cutting to obtain the piezoelectric-piezoresistive composite flexible sensor.
The cutting size is 60mm long, 1mm wide and 2mm high.
The lead is a copper lead with the lead-out length of 30 mm.
As shown in fig. 2, the hydrogel switch-in circuit is shown to illuminate a small bulb, demonstrating its conductive properties.
As shown in fig. 3, the stress-strain curves of hydrogels added with different amounts of PVDF-TrFE are shown, and when the addition amounts are different, the elongation at break and the tensile strength of the hydrogels are compared, and when the addition amount is 250mg, the tensile strength and the elongation at break are both at optimal values, so that the addition amount is suitable for a strain sensor.
As shown in FIG. 4, the GF factor of PVDF-TrFE/PEDOT PSS chitosan hydrogel shows a trend of rising and falling firstly along with the addition of PVDF-TrFE, and when the PVDF-TrFE addition amount is 250mg, the GF factor of the prepared hydrogel reaches the highest, and can reach 19.24.
As shown in fig. 5, it can be seen from the graph that the change rate of the resistance changes regularly with time as the finger is bent, and when the bending angle of the finger is different, the change rate of the resistance of the hydrogel is also different, which proves that the PVDF-TrFE/chitosan hydrogel has excellent piezoresistive strain sensing performance.
As shown in fig. 6, the curve in the figure shows that the voltage change rate of the hydrogel is different when the bending angle of the finger is different along with the regular change of the bending voltage change rate of the finger along with the time, so that the PVDF-TrFE/chitosan hydrogel has intentional piezoelectric strain sensing performance.
As shown in FIG. 7, the hydrogel can generate a 40mV voltage signal when being compressed, stretched or bent, the signal response speed is high, and the hydrogel can generate regular resistance change under the same response in FIG. b, so that the piezoresistive performance of the hydrogel is proved.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, component disassembly, or combination thereof, etc. that falls within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. The preparation method of the PVDF-TrFE chitosan hydrogel is characterized by comprising the following steps:
s1) preparing PVDF-TrFE/cross-linked chitosan quaternary ammonium salt concentrated solution
S101), preparing PEDOT (sodium dodecyl sulfate)/chitosan quaternary ammonium salt aqueous solution: adding PEDOT PSS conductive liquid and deionized water into a beaker, then adding chitosan quaternary ammonium salt, stirring for 5min, and standing for 24h to obtain PEDOT PSS/chitosan quaternary ammonium salt aqueous solution;
s102), preparing PEDOT (poly (styrene-co-butylene) PSS/crosslinked chitosan quaternary ammonium salt solution: adding epichlorohydrin into the PSS/chitosan quaternary ammonium salt aqueous solution of PEDOT in the step S101), stirring for 4 hours at constant temperature, continuously dropwise adding sodium hydroxide solution during the reaction period to maintain the pH of the reaction system at 10, naturally cooling the reaction system to room temperature after the reaction is finished, and regulating the pH value to 7 by using hydrochloric acid solution to obtain the PEDOT PSS/crosslinked chitosan quaternary ammonium salt solution;
s103), dialysis: pouring the PEDOT PSS/crosslinked chitosan quaternary ammonium salt solution in the step S102) into a dialysis bag, placing the dialysis bag into a beaker, measuring deionized water, adding the deionized water into the beaker, and dialyzing for 72 hours, wherein the deionized water is changed every 24 hours;
s104), preparing PVDF-TrFE solution: adding PVDF-TrFE into DMSO solution, stirring at room temperature for 30min, and performing ultrasonic treatment for 60min to ensure complete dissolution of PVDF-TrFE;
pouring the dialyzed PEDOT PSS/crosslinked chitosan quaternary ammonium salt solution in the step S103) into a beaker, then adding glycerol, adding the DMSO solution dissolved with PVDF-TrFE, concentrating in a water bath magnetic stirrer at the concentration temperature of 70 ℃ for 7 hours to obtain PVDF-TrFE crosslinked chitosan quaternary ammonium salt concentrated solution, pouring the PVDF-TrFE crosslinked chitosan quaternary ammonium salt concentrated solution into a glassware, standing and removing bubbles for standby;
s2), preparing PVDF-TrFE/chitosan quaternary ammonium salt hydrogel
S201), ultrasonic treatment: placing the beaker filled with the PVDF-TrFE crosslinked chitosan concentrated solution in the step S104) in a magnetic water bath kettle, stirring for 1h, and carrying out ultrasonic treatment for 1h to obtain blue-black PVDF-TrFE/chitosan quaternary ammonium salt hydrogel precursor liquid;
s202), pouring the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel precursor solution in the step S201) into a mould, and then performing thermal gel forming, wherein the thermal drying temperature is 70 ℃, and the forming time is 4 hours, so as to obtain PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
s3, detection, assay, analysis and characterization
Detecting, analyzing and characterizing the mechanical property and the strain sensing property of the prepared PVDF-TrFE/chitosan quaternary ammonium salt hydrogel;
carrying out mechanical property analysis by using a digital universal stretcher;
analyzing GF factors by a digital universal stretcher;
strain sensing performance analysis was performed with a Keithley MM6500 multimeter;
conclusion: the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel can realize the cooperation of piezoelectric-piezoresistive effects by adding PEDOT-PSS conductive liquid and PVDF-TrFE solution, and the obtained PVDF-TrFE/chitosan quaternary ammonium salt hydrogel has excellent strain sensing performance and can be used for preparing a stretchable high-sensitivity hydrogel strain sensor.
2. The method for preparing a PVDF-TrFE chitosan hydrogel according to claim 1, wherein in step S104), the PVDF-TrFE chitosan hydrogel is concentrated to 20% of the original volume by using a water bath magnetic stirrer.
3. The method for preparing the piezoelectric-piezoresistive composite flexible sensor according to claim 1, wherein the mass ratio of chitosan quaternary ammonium salt to PEDOT to PSS conductive liquid is 2:5, the feeding mass ratio of the sugar quaternary ammonium salt to the PVDF-TrFE solution is 2:0.1 to 0.5.
4. The method for preparing the piezoelectric-piezoresistive composite flexible sensor according to claim 1, wherein the feeding ratio of the chitosan quaternary ammonium salt to the PVDF-TrFE solution is 0.05-0.25:1.
5. the application of the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel prepared by the preparation method according to claim 1 as a strain sensor is characterized in that the application comprises the steps of placing two wires in a mold, pouring the PVDF-TrFE/chitosan quaternary ammonium salt hydrogel into the mold, preparing a flexible sensor by a hot baking molding mode, taking off a sensor spline from the mold after 8h of hot baking at 70 ℃, and cutting to obtain the piezoelectric-piezoresistive composite flexible sensor.
6. The method for manufacturing a piezoelectric-piezoresistive composite flexible sensor according to claim 5, wherein the dimensions of the cutting are 60mm long, 1mm wide and 2mm high.
7. The method for manufacturing a piezoelectric-piezoresistive composite flexible sensor according to claim 5, wherein the lead is a copper lead with a lead-out length of 30 mm.
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