Preparation method of gradient macroporous conductive composite hydrogel for flexible strain sensor

A composite hydrogel and strain sensor technology, applied in the field of preparation of gradient macroporous conductive composite hydrogel, can solve the problems of affecting the sensitivity of the sensor, blockage of hydrogel pores, volume expansion of polyaniline, etc., to improve sensitivity, prevent Structural damage, the effect of improving electrical conductivity

Active Publication Date: 2022-06-14
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrogel generally has a small pore size (usually less than 1 μm, and can reach several microns after pore formation), and the hydrogel pore blockage is prone to occur during the process of adsorbing aniline in situ polymerization, resulting in low utilization of aniline and affecting the sensor. sensitivity
In addition, polyaniline will expand in volume when energized for a long time, resulting in structural damage and performance degradation

Method used

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  • Preparation method of gradient macroporous conductive composite hydrogel for flexible strain sensor
  • Preparation method of gradient macroporous conductive composite hydrogel for flexible strain sensor
  • Preparation method of gradient macroporous conductive composite hydrogel for flexible strain sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Dissolve 0.05g sodium chloride and 0.1g sodium dodecyl sulfate in 10ml deionized water, add 54μL dodecyl methacrylate, stir for 3h, add 30mg graphene oxide (GO), and then add 5.3g Acrylamide (AAm), 17.2mg N,N'-methylenebisacrylamide (MBA), 0.02g sodium carbonate, 0.05g ammonium persulfate (APS), fully dissolved by magnetic stirring, polymerized at 45°C for 6h, prepared GPH.

[0033] (2) The prepared GPH was immersed in 80ml 0.2mol / L ascorbic acid solution for 5h, then heated at 90°C for 8h, and then soaked in deionized water for 48h (deionized water was changed every 4h), after cleaning and removing impurities RGPH was prepared.

[0034] (3) The prepared RGPH was placed in 80 ml of 0.1 mol / L aniline hydrochloride solution containing 1.6 mmol of phytic acid, sealed and stored for 12 h, and then cooled in an environment of 0-5 °C; 1.824 g of ammonium persulfate was added to the Mix with 5ml of deionized water, and after cooling to below 5°C, pour it into the above s...

Embodiment 2

[0059] (1) Dissolve 0.1g sodium chloride and 0.1g sodium dodecyl sulfate in 10ml deionized water, add 54μL hexadecyl methacrylate, stir for 3h, add 30mg graphene oxide (GO), and then add 5.3g Acrylamide (AAm), 17.2mg N,N'-methylenebisacrylamide (MBA), 0.02g sodium bicarbonate, 0.05g ammonium persulfate (APS), fully dissolved by magnetic stirring, polymerized at 45°C for 6h, prepared. Get GPH.

[0060] (2) Immerse the prepared GPH in 80ml 0.2mol / L valine for 5h, then heat at 90°C for 8h, then soak in deionized water for 48h (change deionized water every 4h), wash and remove impurities RGPH was prepared.

[0061] (3) The prepared RGPH was placed in 80ml of 0.05mol / L aniline hydrochloride solution containing 1.0mmol of phytic acid, sealed and stored for 12h, and then cooled in an environment of 0-5°C; 0.912g of ammonium persulfate was added to Mix with 5ml of deionized water, and after cooling to below 5°C, pour it into the above solution and mix evenly. After 24 hours of react...

Embodiment 3

[0063] (1) Dissolve 0.15g sodium chloride and 0.3g sodium dodecyl sulfate in 10ml deionized water, add 54μL octadecyl methacrylate, stir for 3h, add 20mg graphene oxide (GO), and then add 5.3g Acrylamide (AAm), 17.2mg N,N'-methylenebisacrylamide (MBA), 0.03g sodium bicarbonate, 0.05g ammonium persulfate (APS), fully dissolved by magnetic stirring, polymerized at 45°C for 6h, prepared. Get GPH.

[0064] (2) Immerse the prepared GPH in 80ml 0.2mol / L cysteine ​​for 5h, then heat at 90°C for 8h, then soak in deionized water for 48h (change deionized water every 4h), wash and remove impurities RGPH was obtained after.

[0065] (3) The prepared RGPH was placed in 80ml of 0.15mol / L aniline hydrochloride solution containing 2.4mmol of phytic acid, sealed and stored for 12h, and then cooled in an environment of 0-5°C; 2.738g of ammonium persulfate was added to Mix with 5ml of deionized water, and after cooling to below 5°C, pour it into the above solution and mix evenly. After 24 hou...

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Abstract

The invention discloses a preparation method of gradient macroporous conductive composite hydrogel applied to a flexible strain sensor, and belongs to the field of flexible electronic materials. Graphene and polyaniline are jointly used as conductive substances, polyacrylamide is used as a flexible substrate, and graphene oxide / polyacrylamide-based composite hydrogel containing a foaming agent is prepared, graphene / polyacrylamide-based conductive composite hydrogel with a gradient macroporous structure is prepared, and aniline in-situ polymerization is carried out, so that the graphene / polyacrylamide-based conductive hydrogel is prepared. The gradient macroporous conductive composite hydrogel is obtained. The gradient macroporous conductive composite hydrogel prepared by the invention has excellent mechanical property and sensing property, high sensitivity, wide strain detection range and good cycling stability, can be widely applied to wearable electronic equipment such as flexible sensors and the like, and has wide application prospects in the fields of human motion monitoring and the like.

Description

technical field [0001] The invention belongs to the field of flexible electronic materials, relates to the preparation of a flexible strain sensor, in particular to a preparation method of a gradient macroporous conductive composite hydrogel applied to the flexible strain sensor. Background technique [0002] With the development of wearable electronic devices and people's attention to physical health, the application demand of flexible strain sensors in the field of human motion monitoring is increasing. Traditional sensors cannot withstand excessive deformation due to their brittleness, and cannot meet the needs of human motion monitoring. At the same time, complex processes and expensive costs further limit their development. Therefore, there is an urgent need to develop flexible strain sensors with a wide strain detection range, high sensitivity and low cost. [0003] The hydrogel has high water content and good biocompatibility, and the hydrogel-based flexible strain s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08J9/08C08L33/26C08F220/56C08F220/18C08F222/38C08K3/04G01L1/22
CPCC08J9/405C08J9/40C08J9/08C08F220/56G01L1/22C08J2333/26C08J2203/02C08K3/042C08F220/1812C08F222/385
Inventor 李晓逄述博张卫英陈兰兰赵海兰朱鹏城
Owner FUZHOU UNIV
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