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An ultrafast self-healing polysaccharide-based hydrogel strain sensor and its preparation method

A strain sensor and hydrogel technology, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of external stimulation, non-self-healing, poor stretchability, etc., to achieve wide detection range, broaden the application, Inexpensive effect

Active Publication Date: 2021-11-19
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the common disadvantages of traditional hydrogel-based flexible devices such as poor stretchability, self-healing after damage, need for external stimulation and slow speed, self-healing under water, high price and inability to completely degrade, etc., and propose A rapid self-healing and stretchable polysaccharide-based hydrogel strain sensor prepared by a one-pot method using natural polysaccharides and polyvinyl alcohol

Method used

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  • An ultrafast self-healing polysaccharide-based hydrogel strain sensor and its preparation method
  • An ultrafast self-healing polysaccharide-based hydrogel strain sensor and its preparation method
  • An ultrafast self-healing polysaccharide-based hydrogel strain sensor and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1: put 7 g soluble potato starch, 1 g polyvinyl alcohol and 0.7 g borax into a beaker;

[0028] Step 2: Add 45 mL of deionized water into the above beaker, and mechanically stir at the oil bath temperature (98 °C) at a speed of 300 r / min for 4 h, so that the starch and polyvinyl alcohol are fully swollen and dissolved, and the borax is completely dissolved to obtain Starch-polyvinyl alcohol-borax sol;

[0029] Step 3: Stop the mechanical stirring and remove the stirring rod, and continue heating in the oil bath at 98 °C for 2 h until the bubbles in the solution are completely removed;

[0030] Step 4: Pour the above sol into the mold and cool at room temperature to obtain a stretchable and ultrafast self-healing polysaccharide conductive hydrogel;

[0031] Step 5: Encapsulate the hydrogel with a stretchable tape and install conductive electrodes to form a flexible strain sensor.

[0032] figure 1 Infrared spectra measured after freeze-drying for the ultrafast se...

Embodiment 2

[0037] Step 1: Put a mixture of 10 g soluble potato starch and carboxymethyl potato starch (2:1), 0.1 g polyvinyl alcohol, and 1 g borax into a beaker;

[0038] Step 2: Add 60 mL of deionized water into the above beaker, and mechanically stir at an oil bath temperature (110 °C) at a speed of 600 r / min for 2 h to fully swell the soluble potato starch-carboxymethyl starch and polyvinyl alcohol Dissolving, borax dissolves completely, obtains soluble potato starch-carboxymethyl starch-polyvinyl alcohol-borax sol;

[0039] Step 3: Stop the mechanical stirring and remove the stirring rod, and continue heating in the oil bath at 110 °C for 2 h until the air bubbles in the sol are completely removed;

[0040] Step 4: Pour the above sol into the mold and cool at room temperature to obtain a stretchable and ultrafast self-healing polysaccharide conductive hydrogel;

[0041] Step 5: Encapsulate the hydrogel with stretchable tape and install conductive electrodes to form a flexible strai...

Embodiment 3

[0044] Step 1: Put 4 g of agarose, 3 g of polyvinyl alcohol, and 0.6 g of borax into a beaker;

[0045] Step 2: Add 70 mL of deionized water into the above beaker, and mechanically stir at the oil bath temperature (100 °C) at 400 r / min for 3 h, so that the agarose and polyvinyl alcohol are fully swollen and dissolved, and the borax is completely dissolved. Obtain agarose-polyvinyl alcohol-borax sol;

[0046] Step 3: Stop the mechanical stirring and remove the stirring rod, and continue heating in the oil bath at 100 °C for 2 h until the air bubbles in the sol are completely removed;

[0047] Step 4: Pour the above sol into the mold and cool at room temperature to obtain a stretchable and ultrafast self-healing polysaccharide conductive hydrogel;

[0048] Step 5: Encapsulate the hydrogel with stretchable tape and install conductive electrodes to form a flexible strain sensor;

[0049] Referring to Example 1 to investigate the hydrogel-based flexible strain sensor prepared in th...

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Abstract

The invention discloses an ultrafast self-healing polysaccharide-based hydrogel strain sensor and a preparation method thereof. A stretchable and completely degradable hydrogel with ultrafast self-healing is prepared by a one-pot method using natural polysaccharides and polyvinyl alcohol. glue, and apply it to the field of flexible strain sensors. Under the synergistic effect of dynamic boron ester bonds and hydrogen bonds, the hydrogel shows ultrafast self-healing ability in both air and water, which solves the problem of slow healing of flexible devices after damage, which requires external stimuli such as light, heat, electricity, etc. Problems such as inability to heal underwater and refractory degradation to pollute the environment. In addition, the hydrogel has rapid response to tensile strain and compressive strain, and can realize real-time monitoring of small deformations such as throat vocalization, swallowing, frowning, etc., and large deformations caused by limb movements such as fingers, elbows, and knees. The hydrogel strain sensor of the invention has a simple preparation process, is environmentally friendly, low in price and can be completely degraded, and has broad application prospects in the field of flexible electronics.

Description

technical field [0001] The invention relates to an ultrafast self-healing polysaccharide hydrogel strain sensor and a preparation method thereof, which can be specifically applied to flexible wearable devices, flexible electronic skins, real-time motion monitors, flexible robots, and actuators. Background technique [0002] In the past ten years, with the rapid development of new flexible devices such as human-computer interaction, implantable physiological signal tracking system, medical health monitoring and energy storage, the mechanical properties of the materials used are similar to or exceed those of soft biological tissues. research hotspots. Mimicking human tactile abilities as well as having good mechanical properties and electrical conductivity is the ultimate goal. Soft stretchable strain sensors prepared by filling conductive materials (graphene, carbon nanotubes, metal particles, nanowires, etc.) Uniformity, the detection range of the material is limited durin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16C08L3/02C08L29/04C08J3/075
CPCC08J3/075C08J2303/02C08J2429/04G01B7/18
Inventor 徐敏王艳玲黄海龙韩卢杨仲丽蒋治成
Owner EAST CHINA NORMAL UNIV
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