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Preparation method of hydrogel sensing material and hydrogel sensor

A sensing material, hydrogel technology, applied in the field of intelligent soft materials, can solve the problems of loss of elasticity and conductivity, limited use temperature, poor anti-ultraviolet performance, etc., and achieve high strength, high toughness, excellent frost resistance, ultra- The effect of strong UV resistance

Active Publication Date: 2021-09-24
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under these extreme environments, hydrogels may encounter low temperature, hypoxic environment, ultraviolet exposure, burns, and marine environment, etc., while traditional conductive hydrogels tend to freeze below 0 °C and lose their elasticity and conductivity, This limits the temperature at which they can be used
At the same time, traditional conductive hydrogels have poor UV resistance

Method used

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  • Preparation method of hydrogel sensing material and hydrogel sensor
  • Preparation method of hydrogel sensing material and hydrogel sensor
  • Preparation method of hydrogel sensing material and hydrogel sensor

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preparation example Construction

[0035] An aspect of the embodiments of the present disclosure provides a method for preparing a hydrogel sensing material, comprising:

[0036] Step (1) adding chitosan to hydrochloric acid to form a transparent solution under stirring in a water bath;

[0037] Step (2) After the transparent solution returns to room temperature, add acrylamide, N,N'-methylenebis(acrylamide), 2,2'-azobis(2-methylpropionamidine) dihydrochloride and aniline, and stirred to dissolve;

[0038] Step (3) Degas the stirred and dissolved solution by ultrasonic cleaning, then pour it into a mold, put the mold into a constant temperature box, use N,N'-methylenebis(acrylamide) as a crosslinking agent, 2,2'-Azobis(2-methylpropionamidine) dihydrochloride is used as a thermal initiator for free radical polymerization of acrylamide monomers in a thermostat to generate polyacrylamide composite hydrogels;

[0039] Step (4) immersing the polyacrylamide composite hydrogel in the ammonium persulfate solution, tr...

Embodiment 1

[0058] (1) Add 0.3g of chitosan to 10mL of clear water to form a transparent solution under stirring in a water bath at 55°C.

[0059] (2) After the transparent solution returns to room temperature, add 1.42g acrylamide, 10.79mg N, N'-methylenebis(acrylamide), 5.42mg 2,2'-azobis(2-methylpropionamidine) ) dihydrochloride and 250 μL aniline, and stir well to dissolve.

[0060] (3) The above solution was degassed by ultrasonic cleaning for 2 minutes, and then poured into a mold consisting of two glass plates separated by a 1 mm silicone gasket. Using N, N'-methylenebis(acrylamide) as crosslinking agent, 2,2'-azobis(2-methylpropionamidine) dihydrochloride as the thermal initiator of acrylamide monomer free The base polymerization reaction was carried out in a constant temperature box at 57°C for 12 hours to form a polyacrylamide composite hydrogel.

[0061] (4) Immerse the polyacrylamide composite hydrogel in an excess of 0.5 mol / L ammonium persulfate solution, trigger the in si...

Embodiment 2

[0064] (1) Add 0.5 g of chitosan to 10 mL of 0.5 mol / L hydrochloric acid to form a transparent solution under stirring in a water bath at 60°C.

[0065] (2) After the transparent solution returns to room temperature, add 2.13g acrylamide, 16.19mg N, N'-methylenebis(acrylamide), 8.14mg 2,2'-azobis(2-methylpropionamidine) ) dihydrochloride and 750 μL aniline, and stir well to dissolve.

[0066] (3) The above solution was degassed by ultrasonic cleaning for 5 minutes, and then poured into a mold consisting of two glass plates separated by a 2 mm silicone gasket. Free radicals of aniline monomers with N,N'-methylenebis(acrylamide) as crosslinking agent and 2,2'-azobis(2-methylpropionamidine) dihydrochloride as thermal initiator The polymerization reaction was carried out in a thermostat at 50° C. for 12 hours to generate a polyacrylamide composite hydrogel.

[0067] (4) The polyacrylamide composite hydrogel was immersed in an excess of 1 mol / L ammonium persulfate solution, and t...

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Abstract

The invention provides a preparation method of a hydrogel sensing material and a hydrogel sensor. The hydrogel sensing material is prepared by the following steps: adding chitosan into hydrochloric acid, stirring in a water bath to form a transparent solution, adding acrylamide, N, N '-methylenebis (acrylamide), 2, 2'-azobis (2-methylpropiamidine) dihydrochloride and aniline after the transparent solution returns to room temperature, stirring and dissolving, carrying out ultrasonic cleaning on the obtained solution for degassing, injecting the polyacrylamide hydrogel into a mold, putting the mold into a constant-temperature box, reacting to generate polyacrylamide composite hydrogel, and immersing the polyacrylamide composite hydrogel into an ammonium persulfate solution to initiate aniline in-situ oxidative polymerization, and finally, immersing the obtained polyaniline / chitosan-polyacrylamide composite hydrogel into an ammonium sulfate solution to obtain the polyaniline / chitosan-polyacrylamide ion-covalent dual-network hydrogel. The prepared polyaniline / chitosan-polyacrylamide ion-covalent dual-network hydrogel can be directly used as a hydrogel sensor.

Description

technical field [0001] The invention belongs to the field of intelligent soft materials, and in particular relates to a preparation method and application of a hydrogel sensing material with excellent frost resistance and super ultraviolet resistance. Background technique [0002] Hydrogels are composite materials composed of large amounts of water and a three-dimensional polymer network. Conductive hydrogels are special types of hydrogels that can be obtained by adding conductive materials (such as graphite materials and carbon nanotubes), free ions, conductive polymers (such as polyaniline, polypyrrole, etc.) or liquid metals to the polymer network. In , external stimuli are converted into changes in electrical signals to obtain electrical conductivity. [0003] In recent years, the demand for multifunctional hydrogels has been growing, and the applications of hydrogels in the fields of tissue engineering, drug release, and soft electronics are becoming more and more comm...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08F251/00C08F220/56C08F222/38C08L51/02C08L79/02G01D5/12
CPCC08J3/075C08F251/00G01D5/12C08J2351/02C08J2479/02C08F220/56C08F222/385
Inventor 骆天治丛璟
Owner UNIV OF SCI & TECH OF CHINA
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