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A high-strength multifunctional ion-conducting hydrogel and its preparation method and application

An ion-conducting, multi-functional technology, applied in the field of sensors, can solve problems such as opacity, and achieve the effects of large tensile strain and pressure range, high sensing sensitivity, and expanded application range

Active Publication Date: 2021-10-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a series of rigid hydrogels are introduced to improve mechanical properties. The most widely used is PVA hydrogel, but the introduction of PVA chains will sacrifice its transparency while maintaining high strength, because PVA chains will generate crystallization during the freezing cycle. , is also the reason for the high strength and opacity of PVA hydrogels

Method used

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  • A high-strength multifunctional ion-conducting hydrogel and its preparation method and application
  • A high-strength multifunctional ion-conducting hydrogel and its preparation method and application
  • A high-strength multifunctional ion-conducting hydrogel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Add different amounts of β-CD powder into 50g deionized water respectively, stir at 60°C and 380rpm until dissolved, and obtain β -CD solution; then add 6.4g PVA (the molecular weight of PVA is ~75000g / mol), heat up to 95°C, and stir at 380rpm until completely dissolved; pour into a mold to cool to room temperature, and freeze at -20°C for 12h Thaw at room temperature for 1 h, and carry out 3 freeze-thaw cycles; finally put the β-CD / PVA hydrogel in the mixed solution PAA / KCl (the mass of PAA, KCl and water in the mixed solution are 50g, 25g, 117g respectively ) after soaking for 48 hours to obtain (0.5%, 2%, 3.5%, 5%, 6.5%) β-CD / PVA / PAA / KCl ion-conducting hydrogels.

[0038]Cut (0.5%) β-CD / PVA / PAA / KCl ion-conductive hydrogel into 4cm long and 1cm wide rectangular strips for stress-strain testing. The distance between the chucks of the material testing machine is 1cm, and the tensile rate is 10mm / min, the test result is that the elongation at break is 400%, the tensile...

Embodiment 2

[0045] Add 2wt% β-CD powder into 50g of deionized water, stir at 60°C and 380rpm until dissolved; then add 6.4g of PVA, heat up to 95°C, and stir at 380rpm until completely dissolved; pour into a mold to cool to room temperature, and thawed at room temperature for 1 hour after being frozen at -20°C for 12 hours, so that the freeze-thaw cycle was carried out 3 times; finally, the β-CD / PVA hydrogel was mixed in the mixed solution PAA / KCl (PAA in the mixed solution, The β-CD / PVA / PAA / KCl ion-conductive hydrogel can be obtained after soaking in KCl and water (50 g, 25 g, 117 g respectively) for 48 hours.

[0046] The ion-conductive hydrogel was cut into 4cm long and 1cm wide rectangular strips, and the stress-strain test was carried out. The distance between the chucks of the material testing machine was 1cm, and the tensile rate was 10mm / min. The test result showed that the elongation at break was 504%. , the tensile strength is 1.55MPa, and the elasticity is 420kPa; cut into a cy...

Embodiment 3

[0048] Add 3.5wt% β-CD powder into 50g of deionized water, stir at 60°C and 380rpm until dissolved; then add 6.4g of PVA, heat up to 95°C, and stir at 380rpm until completely dissolved; pour into the mold Cool to room temperature, freeze at -20°C for 12 hours and then thaw at room temperature for 1 hour. This freeze-thaw cycle was performed 3 times; finally, the β-CD / PVA hydrogel was dissolved in the mixed solution PAA / KCl (PAA in the mixed solution , KCl and the quality of water are respectively 50g, 25g, 117g) soaked in 8, 16, 24, 32, 40, 48, 56, 64, 72h respectively to obtain 7 β-CD / PVA / PAA / KCl-x ( x=8, 16, 24, 32, 40, 48, 56, 64, 72) ion-conducting hydrogel samples.

[0049] Cut the β-CD / PVA / PAA / KCl-x ion-conductive hydrogel into 4cm long and 1cm wide rectangular strips for stress and strain testing. The distance between the chucks of the material testing machine is 1cm, and the tensile rate is 10mm / min , and the measured tensile strengths were 0.23, 0.51, 0.96, 1.39, 1.6...

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Abstract

The invention belongs to the technical field of sensors, and discloses a high-strength multifunctional ion-conductive hydrogel, a preparation method and application thereof. The method comprises the following steps: soaking the solid gel prepared by polyvinyl alcohol and β-cyclodextrin aqueous solution in polyacrylic acid / water-soluble salt mixed solution to obtain ion-conductive hydrogel. The method of the present invention is simple, and the prepared ion-conducting hydrogel has transparency, high mechanical properties, good electrical conductivity, stretchability, excellent strain / pressure sensitivity and dual responsiveness of pH / organic solvent; it can be applied to sensors, including Applications in human tissue engineering and flexible electronics.

Description

technical field [0001] The invention belongs to the technical field of sensors, and in particular relates to a PVA double-crosslinked network ion-conductive hydrogel, a preparation method thereof and an application in a multifunctional sensor. Background technique [0002] In recent years, sensors have shown a trend of multifunctionality. The basic research and application market of multifunctional sensors continue to expand. Among them, the development of flexible electronic devices urgently needs soft conductors with multiple functions at the same time, such as mechanical properties (tensile strength, stretchability and elasticity, etc.), electrical conductivity and transparency, and so on. Especially for the realization of next-generation portable and wearable electronics, such as flexible circuits, stretchable displays, or energy storage devices, there is an urgent need for a high-strength stretchable flexible conductor that can avoid unnecessary breakage when subjected...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L33/02C08L29/04C08L5/16G01N3/08G01N21/59G01N27/04
CPCC08J3/075C08J2333/02C08J2405/16C08J2429/04G01N3/08G01N21/59G01N27/041G01N2203/0017G01N2203/0019
Inventor 祁海松余杰党超王明吕发创刘德桃
Owner SOUTH CHINA UNIV OF TECH
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