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

A composite hydrogel and nanofiber technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc., can solve the problems of lack of research, achieve high strain sensitivity, improve mechanical properties, and high toughness

Active Publication Date: 2020-02-11
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 nanofiber/polyvinyl alcohol/polyaniline composite hydrogel and preparation method and application thereof
  • Aramid nanofiber/polyvinyl alcohol/polyaniline composite hydrogel and preparation method and application thereof
  • Aramid nanofiber/polyvinyl alcohol/polyaniline composite hydrogel and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1 g of Kevlar spun fiber 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.

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

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

[0033] The above mixed system was cast in a mold, and then immersed in water for solvent exchange for 24 hours to form an ANF / PVA hydrogel with a specific geometric shape.

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

Embodiment 2

[0036] Weigh 1 g of Kevlar spun fiber 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, then dissolve at a high temperature of 90 to 95°C until it is completely transparent, and stand until the bubbles completely disappear to obtain a 100 mg / mL PVA solution.

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

[0039] The above mixed system was cast in a mold, and then immersed in water for solvent exchange for 24 hours to form an ANF / PVA hydrogel with a specific geometric shape.

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

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Abstract

The invention discloses an aramid nanofiber/polyvinyl alcohol/polyaniline composite hydrogel, and a preparation method and application thereof. The composite hydrogel is prepared with aramid nanofibers and a polyvinyl alcohol hydrogel as matrixes and through in-situ polymerization with polyaniline under an acidic condition. Under the interaction of various hydrogen bonds, the mechanical strength and toughness of the composite hydrogel are remarkably improved. Meanwhile, due to the existence of the conductive polyaniline, the composite hydrogel disclosed by the invention has relatively high sensitivity, and can repeatedly and stably detect the changes of electric signals in practical application. The composite hydrogel provided by the invention has high mechanical strength, high toughness and high sensitivity, and is applicable to 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 transduction to realize real-time detection of external stimuli. This type of material has great application potential in the fields of human clinical diagnosis, health monitoring and evaluation, flexible touch screen, flexible electronic skin, and industrial robots. Hydrogel is a kind of soft and wet polymer, which is entangled with each other through physical or chemical crosslinking to form a three-dimensional space network structure. It not only has good flexibility similar to biological tissue, but also has the same fl...

Claims

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Application Information

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Patent Type & Authority Applications(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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