Ionic conductive hydrogel as well as preparation method and application thereof

A technology of ion conduction and hydrogel, applied in application, diagnostic recording/measurement, diagnosis, etc. Repair ability and other problems, achieve excellent mechanical sensing performance, prolong service life and function, and stabilize resistance change

Active Publication Date: 2022-05-31
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, monovalent metal cations are doped in the gel network to give it conductivity to meet the application in sensor devices, but the hydrogel is a covalent cross-linking system, which limits the mobility of the polymer chain, thereby reducing The self-healing ability of the hydrogel is impaired, and it does not have self-healing properties, thus limiting the application and life of the hydrogel
[0004] Chinese patent CN110698693 A discloses a polyacrylamide (PAM) and acetic acidified polyvinyl alcohol (PVAA) interpenetrating network hydrogel precursor, and then utilizes acetoacetic acid to obtain chelation with ferric ions to achieve electrical conductivity at the same time and self-healing properties, but the elongation at break of the hydrogel is 500%, which cannot meet the requirements for the use of high-performance hydrogel sensors
However, its preparation method is complicated, the preparation time is long, and the monomer selectivity is high.

Method used

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  • Ionic conductive hydrogel as well as preparation method and application thereof
  • Ionic conductive hydrogel as well as preparation method and application thereof
  • Ionic conductive hydrogel as well as preparation method and application thereof

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Experimental program
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Effect test

preparation example Construction

[0036] The design idea of ​​the preparation method of the ion-conductive hydrogel of the present invention is as follows: firstly, a phenylboronic acid ionic liquid monomer is designed to endow the hydrogel with excellent multifunctional properties. As a multifunctional monomer, three main structural designs were considered: (1) dynamic borate bond formation between phenylboronic acid and cis-diol; (2) imidazolium salt structure, which can increase the hydrogel ionic conductivity, and can produce hydrogen bonds and electrostatic interactions with other components in the system; (3) the vinyl group in the imidazolium cation is conducive to the firm bonding of multifunctional monomers in the hydrogel network. Secondly, TEMPO-oxidized nanocellulose is selected as the stress-enhanced phase to improve the mechanical strength of the hydrogel. On the one hand, the hydroxyl groups on the nanocellulose can dynamically reversibly combine with the boric acid functional groups in the pheny...

Embodiment 1

[0045] The preparation method of the ion-conductive hydrogel of the present invention specifically comprises the following steps:

[0046] Step 1, preparation of phenylboronic acid ionic liquid monomer: step 1.1, dissolve 0.4297g PBA in 15mL ethyl acetate, continue to stir and sonicate until it is completely dissolved, and obtain solution A; step 1.2, in magnetic stirring solution A Under conditions, after adding 226IL, continue to stir until it is completely dissolved to obtain solution B; step 1.3, the resulting solution B is passed through N 2 reaction at 70°C for 20 hours to obtain mixture C; step 1.4, add 45 mL of ethyl acetate to the mixture C obtained in step 1.3 in 3 times, and carry out rotary evaporation at 35°C until the ethyl acetate is completely evaporated to dryness, that is Product A was obtained, and the product A was vacuum-dried at 45° C. to obtain phenylboronic acid ionic liquid monomer (PBA-IL).

[0047] Step 2, preparation of multifunctional ion-conducti...

Embodiment 2

[0052] The preparation method of the ion-conductive hydrogel of the present invention specifically comprises the following steps:

[0053] Step 1, preparation of phenylboronic acid ionic liquid monomer: step 1.1, dissolve 0.4297g PBA in 15mL ethyl acetate, continue to stir and sonicate until it is completely dissolved, and obtain solution A; step 1.2, in magnetic stirring solution A Under conditions, after adding 226IL, continue to stir until it is completely dissolved to obtain solution B; step 1.3, the resulting solution B is passed through N 2 reaction at 70°C for 20 hours to obtain mixture C; step 1.4, add 45 mL of ethyl acetate to the mixture C obtained in step 1.3 in 3 times, and carry out rotary evaporation at 35°C until the ethyl acetate is completely evaporated to dryness, that is Product A was obtained, and the product A was vacuum-dried at 45° C. to obtain phenylboronic acid ionic liquid monomer (PBA-IL).

[0054] Step 2, preparation of ion-conducting hydrogel:

...

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Abstract

The invention discloses ionic conductive hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: step 1, preparing a phenylboronic acid ionic liquid monomer; and 2, preparing the ionic conductive hydrogel according to the product obtained in the step 1. The multifunctional ionic conductive hydrogel provided by the invention is applied to a sensor and is prepared from the multifunctional ionic conductive hydrogel, and the two ends of the multifunctional ionic conductive hydrogel are connected with wires and packaged. The sensor comprises but is not limited to a man-machine interaction sensor, electronic skin and the like. The electronic skin is also called as a novel wearable flexible bionic tactile sensor.

Description

technical field [0001] The invention belongs to the technical field of functional hydrogel, relates to an ion-conducting hydrogel, and also relates to a preparation method of the gel. Background technique [0002] In recent years, with the development of artificial intelligence and new materials, wearable multifunctional hydrogel strain sensors based on bionic skin can convert external stimuli (stretch, compression, bending, expansion, etc.) , electronic skin, human-computer interaction systems, implantable devices, etc. have shown broad application prospects. In order to realize the multifunctional application of hydrogel sensors, in addition to the necessary mechanical strength, conductivity, sensitivity and good adhesion to human skin, it is also necessary to achieve self-healing after damage to prolong its service life and Functional reliability. In general, the self-healing properties of polymer hydrogels come from dynamic covalent bonds (boronate bonds, disulfide bon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F222/38C08F251/02C08K5/55C08J3/075C08L33/26C08L1/04A61B5/00A61B5/11A61B5/259A61B5/266
CPCC08F220/56C08F251/02C08K5/55C08J3/075A61B5/11A61B5/259A61B5/266A61B5/6801C08J2333/26C08J2401/04C08F222/385Y02E60/10
Inventor 张素风姚雪钱立伟魏宁崔书源呼旭旭
Owner SHAANXI UNIV OF SCI & TECH
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