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Preparation method of conductive adhesive hydrogel

A conductive adhesive and hydrogel technology, applied in the field of materials, can solve the problems of easy deposition at the bottom of the solution, difficulty in achieving results, poor dispersion, etc., to achieve improved biocompatibility, exact safety, and good dispersion Effect

Inactive Publication Date: 2021-03-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although carbon nanotubes have excellent electrical conductivity, their dispersibility in aqueous solution is poor, the aggregation phenomenon is serious, and it is easy to deposit at the bottom of the solution after losing the stirring effect. If it is directly applied to the hydrogel system, it is difficult to obtain good conductivity. Effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Preparation of modified carbon nanotubes: Weigh 100g of multi-walled carbon nanotubes and disperse them in 250L Tris-HCl buffer solution with a pH value of 8.5 under the action of ultrasonic waves. After half an hour, transfer the solution to the reaction In the still, weigh 150g of dopamine hydrochloride, turn on mechanical stirring, react for 18 hours, filter and wash the reaction product in circulation, dry the modified carbon nanotubes at 40°C, and set aside;

[0027] (2) Preparation of modified carboxymethyl cellulose: Weigh a certain mass of carboxymethyl cellulose (the degree of carboxylation is 65%~80%) in the reaction kettle, add 100 L of MES buffer solution with pH5.5 , Stir evenly at 35°C to make it completely dissolve, and make a CMC solution with a mass fraction of 2.5%. Then add a certain mass of NHS and EDC in sequence, activate the reaction for 20 min, then add a certain mass of dopamine, adjust the pH of the reaction system to about 5.0 with dilute ...

Embodiment 2

[0030] (1) Preparation of modified carbon nanotubes: Weigh 1 g of single-walled carbon nanotubes, disperse them in 2 L of citric acid-sodium citrate buffer solution with a pH value of 4.4 under the action of ultrasound, and then add 1.2 g dopamine, reacted under stirring for 24h, then centrifuged the reaction mixture at 10000rmp for 10min, took the lower layer of solid and redispersed it in distilled water, centrifuged again, repeated three times, then freeze-dried the reaction product for subsequent use;

[0031] (2) Preparation of oxidized sodium alginate: Weigh 5 g of sodium alginate, add 30 mL of absolute ethanol, and stir magnetically to disperse sodium alginate evenly in ethanol, then dissolve 3 g of sodium periodate in dark 30 mL of distilled water was then added to the ethanol dispersion of sodium alginate, and the reaction was carried out under magnetic stirring for 12 h in the dark, and then ethylene glycol with an equimolar ratio of sodium periodate was added to term...

Embodiment 3

[0035] (1) Preparation of modified carbon nanotubes: Add 1000L of Tris-HCl buffer solution with a pH value of 8.5 into the reaction kettle with an ultrasonic device, turn on the stirring, and weigh 1Kg of multi-walled carbon nanotubes into the reaction kettle , and stirred for 30 minutes. Weigh 0.5Kg of dopamine hydrochloride and add it to the reaction kettle. After continuing to react for 18 hours, the reactant is centrifuged at a speed of 6000rpm in a centrifuge, and the obtained precipitate is washed with 100Kg of ultrapure water, and then centrifuged at a speed of 8000rpm. The obtained precipitate The material was washed with 50Kg ultrapure water, and then centrifuged at a speed of 8000rpm, and the precipitate was freeze-dried and stored for future use.

[0036] (2) Preparation of modified carboxymethyl cellulose: Weigh 2.5Kg carboxymethyl cellulose (the carboxylation degree is 65%~80%) in a reaction kettle with nitrogen as the protective gas, and add the concentration at ...

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Abstract

The invention discloses a preparation method of a conductive adhesive hydrogel. The method comprises the following steps of: carbon nanotubes are modified by dopamine; the modifiedcarbon nanotubes aregrafted to saccharides containing free carboxyl through an amide reaction; mixing acrylamide, the modified carbon nanotubes and the modified saccharides, and forming the hydrogel under the actions ofa crosslinking agent and an initiator. The modified carbon nanotubes can be stably dispersed in an aqueous solution and form hydrogen bonds with other substances and crosslinks with dynamic supramolecules in the hydrogel; the sugar grafted with the dopamine catechol structure can form a hydrogel network, so that the complexity of the hydrogel structure is improved, and the biocompatibility, the adhesion property and the toughness of the hydrogel are enhanced; the hydrogel has physicochemical properties such as electrical conductivity, self-adhesion, high toughness and biocompatibility. The method can be used for preparing conductive hydrogels in the fields of biomedicine, electronic skin, human-computer interface, human body activity monitoring, wearable electronic equipment and the like.

Description

technical field [0001] The invention relates to a preparation method of a conductive adhesive hydrogel, which belongs to the field of materials. Background technique [0002] Hydrogels are a class of condensed matter cross-linked by chemical bonds or physical nodes, characterized by the presence of three-dimensional hydrophilic polymer networks at macroscopic distances, thereby immobilizing large amounts of water. Conductive hydrogels are an emerging class of hydrogels that combine a hydrophilic matrix with conductive fillers, such as metal nanoparticles, conductive polymers, or carbon-based materials. Conductive hydrogels possess the reversible ability between swelling and deswelling, and can be designed to perform liquid exchange or volume transition through controllable responses to a wide range of environmental conditions, such as electric or magnetic fields, light, and ionic conductivity. Therefore, conductive hydrogels hold extraordinary promise in many applications r...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L33/26C08L5/04C08F220/56C08F222/38C08K9/04C08K3/04
CPCC08F220/56C08J3/075C08J2333/26C08J2405/04C08K9/04C08K2201/001C08K2201/011C08K3/041C08F222/385
Inventor 但卫华陈一宁但年华王璐
Owner SICHUAN UNIV
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