Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Hydrogel flexible strain sensor with low Young modulus

A strain sensor, hydrogel flexible technology, applied in the direction of electromagnetic measurement device, electric/magnetic solid deformation measurement, etc., to achieve the effect of good strain-resistance sensitivity, high stretchability, excellent cutting resistance and compression deformation ability

Inactive Publication Date: 2019-12-20
GUANGZHOU UNIVERSITY
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to combine flexibility and transparency into strain sensors is also a great challenge

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hydrogel flexible strain sensor with low Young modulus
  • Hydrogel flexible strain sensor with low Young modulus
  • Hydrogel flexible strain sensor with low Young modulus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare the following reagents in advance:

[0042] 1. Waterborne hexamethylene diisocyanate trimer (WHDT):

[0043] Feed 7g of ethylene glycol monomethyl ether (molecular weight 700) and hexamethylene diisocyanate trimer 5g (molecular weight 500), and mix and stir for 12 hours at 75°C to obtain water-based hexamethylene diisocyanate trimer (WHDT) .

[0044] 2. Ammonium persulfate solution:

[0045]0.04g initiator ammonium persulfate (APS) was dissolved in 50g water to obtain ammonium persulfate solution.

[0046] Preparation method of the strain sensor:

[0047] (1) Dissolve 7.1g of acrylamide monomer (AAm) and 0.02g of chemical cross-linking agent N,N-methylenebisacrylamide (MBAA) in ammonium persulfate (APS) solution, and ultrasonicate for 3 minutes to obtain Hydrogel mother liquor (preparation and use now);

[0048] (2) At room temperature, mix 5mL of the hydrogel mother liquor and 0.15g of the prepared chemical cross-linking agent WHDT, stir until the solution...

Embodiment 2

[0051] Prepare the following reagents in advance:

[0052] 1. Waterborne hexamethylene diisocyanate trimer (WHDT):

[0053] Feed 7g of ethylene glycol monomethyl ether (molecular weight 700) and hexamethylene diisocyanate trimer 5g (molecular weight 500), and mix and stir for 12 hours at 75°C to obtain water-based hexamethylene diisocyanate trimer (WHDT) .

[0054] 2. Ammonium persulfate solution:

[0055] 0.04g initiator ammonium persulfate (APS) was dissolved in water to obtain ammonium persulfate solution.

[0056] Preparation method of the strain sensor:

[0057] (1) Dissolve 7.1 g of acrylamide monomer (AAm) and 0.02 g of chemical cross-linking agent N, N-methylenebisacrylamide (MBAA) in ammonium persulfate solution, and ultrasonicate for 3 minutes to obtain a hydrogel Mother liquor (prepared and used now);

[0058] (2) At room temperature, mix 5mL of the hydrogel mother liquor and 0.24g of the chemical cross-linking agent WHDT, stir until the solution is clear; pour...

Embodiment 3～8

[0061] In Examples 3-8, the time for soaking the hydrogel in pyrrole and the initiator APS is shown in Table 1. All the other steps are as in Example 1.

[0062] Table 1 The soaking time of conductive hydrogel in pyrrole and APS

[0063]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a hydrogel flexible strain sensor with a low Young modulus. The hydrogel flexible strain sensor is prepared from a waterborne hexamethylene diisocyanate trimer (WHDT), N,N-methylene bisacrylamide (MBAA) and an acrylamide monomer jointly, wherein the WHDT and the MBAA serve as a synergistic crosslinking agent, and an impregnation method is adopted to polymerize a polypyrroleconducting layer. According to the hydrogel flexible strain sensor, hydrogel displays high stretchability and powerful mechanical properties and meanwhile has a low Young modulus, so that the strainsensor is comfortable to wear; and the strain sensor has fatigue resistance and good strain resistance sensitivity and is transparent so that the light transmittance is as high as 87%. By use of the impregnation method, ultraviolet light can be absorbed, the light transmittance is easy to control, and the strain sensor has broad application prospects in the fields of wearable and electronic equipment, artificial skin and stretchable electronic equipment.

Description

technical field [0001] The invention belongs to the field of polymer functional materials, in particular to a low Young's modulus hydrogel flexible strain sensor. Background technique [0002] Wearable strain sensors have attracted great attention as the field of materials science develops. "Smart" wearable devices have the advantage of being as comfortable as skin. To achieve this "skin-like" feel, the Young's modulus of such electronic components should be lower than that of human skin (approximately 30-230kPa). A low Young's modulus means that the material can be deformed considerably with relatively little stress. Therefore, wearable strain sensors with low Young's modulus are required to monitor human motion. [0003] However, there is a trade-off between conductivity and Young's modulus, ie materials with low Young's modulus generally have low conductivity, while high conductivity materials have high Young's modulus values. Metals, carbon and ceramics show high ele...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 吴旭陈睿徐秀彬于丹凤毛桃嫣
Owner GUANGZHOU UNIVERSITY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com