Preparation method and application of hydrogel flexible touch sensor

A tactile sensor and hydrogel flexibility technology, applied in the field of flexible wearable sensing, can solve the problems of low stretch rate of hydrogel, low stress sensing performance, insensitive detection of physiological signal changes, etc. Effects of range and detection sensitivity, high sensitivity, excellent elasticity and stretchability

Active Publication Date: 2021-12-10
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The double-crosslinked network hydrogel significantly improves the elastic properties of the hydrogel, but the obtained hydrogel has a relatively low elongation rate, and its performance for stress sensing is low, and it is not sensitive enough to detect small physiological signal changes.

Method used

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  • Preparation method and application of hydrogel flexible touch sensor
  • Preparation method and application of hydrogel flexible touch sensor
  • Preparation method and application of hydrogel flexible touch sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) AAm and PVP were dissolved in deionized water at a molar ratio of 8:1, and stirred with a magnetic stirrer until completely dissolved;

[0031] (2) Dissolve crosslinking agent MBA and photoinitiator APS with 0.1% and 1.5% AAm monomer mass fractions respectively in (1) solution and stir on a magnetic stirrer (temperature ≤ 25° C.) for 3 hours;

[0032] (3) After the solution of (2) is stirred evenly, add PEDOT:PSS with an AAm mass fraction of 0.11%, and place it on a magnetic stirrer and stir slowly until there are no flocs in the solution;

[0033] (4) Take the hydrogel precursor solution in (3) in the PDMS mold, and use a UV lamp with a wavelength of 365nm (optical power density: 535mw cm -2 ) light for 200s to obtain a stretchable conductive hydrogel;

[0034] (5) Take the flexible conductive hydrogel in (4), attach it to the joints of the fingers, straighten the fingers at 30°, 60°, and 90°, then return in the order of 90°, 60°, and 30°, and test Changes in the...

Embodiment 2

[0037] (1) AAm and PVP were dissolved in deionized water at a molar ratio of 8:1, and stirred with a magnetic stirrer until completely dissolved;

[0038] (2) Dissolve crosslinking agent MBA and photoinitiator APS with 0.1% and 1.5% AAm monomer mass fractions respectively in (1) solution and stir on a magnetic stirrer (temperature ≤ 25° C.) for 3 hours;

[0039] (3) After the solution of (2) is stirred evenly, add PEDOT:PSS with an AAm mass fraction of 0.11%, and place it on a magnetic stirrer and stir slowly until there are no flocs in the solution;

[0040](4) Take the hydrogel precursor solution in (3) in the PDMS mold, and use a UV lamp with a wavelength of 365nm (optical power density: 535mw cm -2 ) light for 200s to obtain a stretchable conductive hydrogel;

[0041] (5) Take the flexible conductive hydrogel in (4) and attach it to the wrist and elbow to detect the bending degree and speed of the finger.

[0042] The test results show that the flexible tactile sensor ca...

Embodiment 3

[0044] (1) AAm and PVP were dissolved in deionized water at a molar ratio of 8:1, and stirred with a magnetic stirrer until completely dissolved;

[0045] (2) Dissolve crosslinking agent MBA and photoinitiator APS with 0.1% and 1.5% AAm monomer mass fractions respectively in (1) solution and stir on a magnetic stirrer (temperature ≤ 25° C.) for 3 hours;

[0046] (3) After the solution of (2) is stirred evenly, add PEDOT:PSS with an AAm mass fraction of 0.11%, and place it on a magnetic stirrer and stir slowly until there are no flocs in the solution;

[0047] (4) Take the hydrogel precursor solution in (3) in the PDMS mold, and use a UV lamp with a wavelength of 365nm (optical power density: 535mw cm -2 ) light for 200s to obtain a stretchable conductive hydrogel;

[0048] (5) Take the flexible conductive hydrogel in (4) and attach it to the throat, and repeat the words "Hi", "Hello" and "Hydrogel" in three different syllables in order to distinguish the content of the subjec...

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Abstract

The invention discloses a preparation method and application of a hydrogel flexible touch sensor, and belongs to the field of flexible wearable sensing. The preparation method mainly comprises the following steps: (1) preparing double-network cross-linked hydrogel from polyacrylamide and polyvinylpyrrolidone which have a hydrogen bond complexing effect; (2) initiating cross-linking polymerization of an acrylamide monomer through an initiator ammonium persulfate and a cross-linking agent N, N'-methylene bisacrylamide to form supramolecular hydrogel with a chemical cross-linking structure and a hydrogen bond cross-linking structure; (3) adding a conductive polymer complex poly(3, 4-ethylenedioxythiophene): polystyrolsulfon acid into the hydrogel preparation solution to improve the conductivity of the hydrogel; and (4) injecting the conductive hydrogel precursor solution into a fixed mold, and preparing the flexible touch sensor by adopting an ultraviolet-initiated free radical polymerization means. The prepared conductive stretchable hydrogel film has high stretch rate and sensitive stress responsiveness, and can be used for monitoring the movement or health condition of a human body in real time.

Description

Technical field: [0001] The invention constructs supramolecular stretchable conductive hydrogel through covalent bonds and hydrogen bonds and uses it for the preparation of tactile sensors, belonging to the field of flexible wearable sensing. Background technique: [0002] Environmental pollution and climate change have seriously affected people's health, and improving the quality of life to ensure a healthy life has become an urgent need. However, the medical conditions are difficult to meet the needs of the current population, resulting in the deterioration of early mild diseases and even affecting life. Flexible and wearable electronic devices can monitor the physiological signal changes of the human body in real time. It can monitor and report the early physical abnormalities of the human body in time to relieve medical pressure. [0003] At the heart of flexible electronics are sensing materials. Currently, the most commonly used flexible sensing materials are polydim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F271/02C08F283/00C08F257/00C08F220/56C08F222/38C08F2/48A61B5/00A61B5/11
CPCC08F271/02C08F283/00C08F257/00C08F2/48A61B5/11A61B5/6802C08F220/56C08F222/385
Inventor 殷明杰李自荣吕天润安全福
Owner BEIJING UNIV OF TECH
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