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Ionic gel based on multiple physical crosslinking effects, preparation method and strain sensor

A technology of ion gel and physical cross-linking, which is applied in the fields of electric/magnetic solid deformation measurement, bulk chemical production, electromagnetic measurement devices, etc., can solve the problems of increasing preparation difficulty, affecting conductivity, reducing sensitivity, etc., and achieves good reliability Reproducible, well-touched, technically complex effects

Pending Publication Date: 2022-07-08
MINDU INNOVATION LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that the non-conductive polymer in the ion gel affects the conductivity and thus reduces the sensitivity
Although multifunctional and highly sensitive ion gel pressure sensors have been developed so far, they still face great challenges due to material limitations.
[0004] Although the high-performance ion gel based on the double network structure has made great progress in gel performance and preparation process, the mechanical properties of the obtained ion gel are still not comparable to many high-performance hydrogels, and the chemical interaction Linking bonds inevitably increases the difficulty of preparation
Although a "one-pot" gel rapid preparation strategy has been developed, it still requires the operation of post-heating curing reaction
More importantly, since some double network systems require the design of monomers, the preparation of unconventional polymer monomers with special structures can introduce functionality well, but it increases the difficulty and cost of large-scale production and manufacturing

Method used

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  • Ionic gel based on multiple physical crosslinking effects, preparation method and strain sensor
  • Ionic gel based on multiple physical crosslinking effects, preparation method and strain sensor
  • Ionic gel based on multiple physical crosslinking effects, preparation method and strain sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Embodiment 1, the synthesis of the poly(methyl methacrylate-acrylic acid) of formula III, the steps are as follows:

[0069]

[0070] Take the case where the molar ratio of the monomer A and the monomer B is 5 as an example.

[0071] (1) Weigh 5.60 g (0.56 mmol) of monomer A methyl methacrylate (MMA), 0.80 g (0.112 mmol) of monomer B acrylic acid (AA), and 8.0 mg of initiator azobisisobutyronitrile (AIBN) , 12ml of dioxane were added into the polymerization tube and stirred evenly.

[0072] (2) In the state of high-purity argon, put the solution in the polymerization tube in (1) into liquid nitrogen, after the freezing is complete, the ventilation port of the double-row tube is switched to the air-pumping state, and the interior of the polymerization tube is evacuated , followed by three cycles of ventilation and pumping again, and then thawed at room temperature under ventilation.

[0073] (3) Repeat the step in (2) at least three times to ensure that there is no ...

Embodiment 2

[0076] Embodiment 2, the preparation of described ion gel, concrete steps are as follows:

[0077](1) Take 600 mg of the copolymer prepared in Example 1, dissolve it in a mixed solvent of 6 g of methanol and 1.2 g of toluene, and then add 20.7 mg (with a degree of ionization of 50%) and 29.0 mg (with a degree of ionization of 70%) , 41.4 mg (the degree of ionization is 100%) sodium hydroxide, and stirred for about 4 h until the ionization was completed. Its structure is shown in formula III, wherein M=Na.

[0078]

[0079] (2) 900 mg of ionic liquid [EMIM][TFSI] was added to each of the above solutions, stirred for 6 h, and named as 50-60%, 70-60%, and 100-60%, respectively. Further, the solution is poured into the mold. After drying at room temperature for 12 hours, the solvent was removed, and then it was dried in a vacuum oven at 65°C for 24 hours to obtain a conductive ion gel.

Embodiment 3

[0080] Embodiment 3, the preparation and testing method of described ion gel strain sensor, the concrete steps are as follows:

[0081] (1) The gel material of the ion gel strain sensor to be tested prepared in Example 2 is cut into a rectangle with a cutter. Then connect the two copper wires to both ends of the conductive gel fixed at the mechanical motion joint with conductive tape, and then connect to the Keithley 2601B system source meter to assemble the flexible strain sensor.

[0082] (2) Select the measurement R-T mode in the control software system. After the initial resistance is stabilized, the mechanical movement drives the strain change of the conductive gel at the joint movement, resulting in a change in its resistance. Depending on the magnitude of the movement, the resistance changes are also different, so as to achieve the monitoring purpose of the strain sensor that detects the movement.

[0083] Result analysis:

[0084] figure 1 For the ion gel prepared i...

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Abstract

The invention discloses ionic gel based on multiple physical crosslinking effects, a preparation method and a strain sensor. The ionic gel shows good mechanical properties (the maximum tensile stress is 610KPa, and the strain is 1160%), and the required ionic conductivity (gt at room temperature; 0.12 mS / cm). The sensor can still keep a gel state in a wide temperature range (20-180 DEG C), is suitable for severe environments, and has long-term electrical signal stability. In addition, the strain sensor can be used for detecting movement of different parts of a human body, including bending of fingers, wrists and elbows and slight throat shaking in swallowing and sounding processes, and shows quick response, high sensitivity and good repeatability, which indicates that the ionic gel has the potential of application in flexible electronic equipment.

Description

technical field [0001] The invention relates to the field of polymer gels and sensors, in particular to the application of ionic liquid gels with high mechanical properties in wearable devices such as flexible sensors, and in particular to an ion gel based on multiple physical cross-linking effects, a preparation method and a strain sensor . It has the characteristics of lightness, thinness, softness and bendability, and has high flexibility, stretchability, bendability and sensitivity, and is mainly used for detecting human motion and other fields. Background technique [0002] Ionic liquids are ionic compounds that are completely composed of anions and cations and are in a liquid state at 100°C. Most ionic liquids exhibit a liquid state at or near room temperature. Ionic liquids have good stability, non-flammability, low vapor pressure, difficult volatilization, and excellent solubility, and are good substitutes for traditional organic solvents. At the same time, ionic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/12C08J3/24C08F8/44C08F220/14C08F220/06G01B7/16
CPCC08J3/24C08F8/44C08F220/14G01B7/18C08J2333/12C08F220/06Y02P20/54
Inventor 吕晓林张浩琦邹志刚
Owner MINDU INNOVATION LAB
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