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Aramid fiber nanofiber/polyvinyl alcohol/polyaniline composite hydrogel and its preparation method and application

A technology of composite hydrogels and nanofibers, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc., can solve problems such as lack of research, and achieve the effects of high strain sensitivity, high strength, and high toughness

Active Publication Date: 2022-06-28
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, studies on ANF nanofiber-based hydrogels are relatively lacking and still mainly focus on their excellent mechanical properties.

Method used

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  • Aramid fiber nanofiber/polyvinyl alcohol/polyaniline composite hydrogel and its preparation method and application
  • Aramid fiber nanofiber/polyvinyl alcohol/polyaniline composite hydrogel and its preparation method and application
  • Aramid fiber nanofiber/polyvinyl alcohol/polyaniline composite hydrogel and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1 g of Kevlar spinning fibers and 1.5 g of KOH, add DMSO, and stir at room temperature for four weeks to obtain 20 mg / mL aramid nanofiber solution.

[0031] Weigh 5 g of polyvinyl alcohol with a molecular weight of 145,000 to 165,000, add DMSO, fully swell at room temperature, dissolve at a high temperature of 90 to 95 ° C until completely transparent, and let stand until the bubbles completely disappear to obtain a PVA solution of 100 mg / mL.

[0032] The same volume of 20mg / mL aramid nanofiber solution and 100mg / mL PVA solution (mass ratio ANF:PVA=1:5) were stirred and mixed at 60°C for 4h; the obtained mixed system was dried in vacuum Dry in an oven, remove excess solvent, and control the solids content at 10%.

[0033] The above hybrid system was cast in a mold and then immersed in water for solvent exchange for 24 h to form ANF / PVA hydrogels with specific geometries.

[0034] Cut the ANF / PVA hydrogel to a size of 1 × 3 cm 2 , and it was placed in 20 mL of 1 ...

Embodiment 2

[0036] Weigh 1 g of Kevlar spinning fibers and 1.5 g of KOH, add DMSO, and stir at room temperature for four weeks to obtain a 20 mg / mL aramid nanofiber solution.

[0037] Weigh 5 g of polyvinyl alcohol with a molecular weight of 145,000 to 165,000, add DMSO, fully swell at room temperature, dissolve at a high temperature of 90 to 95 ° C until completely transparent, and let stand until the bubbles completely disappear to obtain a PVA solution of 100 mg / mL.

[0038] The same volume of 20mg / mL aramid nanofiber solution and 100mg / mL PVA solution (mass ratio ANF:PVA=1:5) were stirred and mixed at 50°C for 6h; the obtained mixed system was dried in vacuum Dry in an oven, remove excess solvent, and control the solids content at 15%.

[0039] The above hybrid system was cast in a mold and then immersed in water for solvent exchange for 24 h to form ANF / PVA hydrogels with specific geometries.

[0040] Cut the ANF / PVA hydrogel to a size of 1 × 3 cm 2 , and it was placed in 20 mL of ...

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Abstract

The invention discloses an aramid nanofiber / polyvinyl alcohol / polyaniline composite hydrogel, a preparation method and application thereof. The composite hydrogel is prepared by in-situ polymerizing polyaniline under acidic conditions with aramid fiber nanofiber and polyvinyl alcohol hydrogel as the matrix. Under the interaction of various hydrogen bonds, the mechanical strength and toughness of the composite hydrogel are significantly improved. At the same time, due to the presence of conductive polyaniline, the composite hydrogel of the present invention has high sensitivity, and can repeatedly and stably detect changes in electrical signals in practical applications. The composite hydrogel of the invention has high mechanical strength, high toughness and high sensitivity, and is suitable for the field of wearable strain sensors.

Description

technical field [0001] The invention belongs to the technical field of polymer composite material preparation, and relates to an aramid nanofiber / polyvinyl alcohol / polyaniline composite hydrogel and a preparation method and application thereof. Background technique [0002] Strain sensing materials refer to functional materials that convert external stimuli (such as stretching, compression, etc.) into transmissible electrical signals in the form of signal conduction to realize real-time detection of external stimuli. Such materials have great application potential in the fields of human clinical diagnosis, health monitoring and evaluation, flexible touch screens, flexible electronic skins, and industrial robots. Hydrogel is a kind of soft and wet polymer, which is a solid substance that forms a three-dimensional network structure through physical or chemical cross-linking. In contrast, it has good stretchability and recovery ability, and is an ideal choice for the preparati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08L29/04C08L77/10C08L79/02C08G73/02G01B7/16
CPCC08J3/075C08G73/0266G01B7/18C08J2329/04C08J2477/10C08J2479/02
Inventor 贾红兵王晶林炎坤尹清张旭敏宋万诚李雪雨陆少杰
Owner NANJING UNIV OF SCI & TECH
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