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Composite hydrogel, preparation method and application thereof

A composite hydrogel, hydrogel technology, applied in applications, sensors, measurement of pulse rate/heart rate, etc., to achieve the effect of good strain-responsive electrical conductivity

Active Publication Date: 2019-01-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combining considerable mechanical properties with high sensing sensitivity, it remains a challenge to design stretchable, elastic, strain-sensitive hydrogels as wearable sensors.

Method used

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  • Composite hydrogel, preparation method and application thereof
  • Composite hydrogel, preparation method and application thereof
  • Composite hydrogel, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a double-network hydrogel strain sensing patch with electrical conductivity, the specific preparation process includes the following steps:

[0032] ①Preparation of polyvinyl alcohol single network hydrogel embedded with CMC and monomer Py: mix the PVA solution (10.5mL) with a concentration of 0.1g / mL and the CMC solution (5.5mL) with a concentration of 0.04g / mL , and keep the solution temperature at 95°C, magnetic stirring to mix the two evenly, add 100 μL of HCl solution with a concentration of 20% to the mixed solution, adjust the pH to 4.0, and then add pyrrole (Py) with a concentration of 0.5mol / L The solution was 0.5 mL and stirred for 30 min. After the solution was uniformly mixed, an aqueous solution of glutaraldehyde (0.38 mL) with a concentration of 4.0 mg / mL (0.38 mL) was added, and the mixture was stirred uniformly. Polyvinyl alcohol single network hydrogel of CMC and monomer Py;

[0033] ②PPy / CMC-Fe 3+ / PVA composite hydrogel prepar...

Embodiment 2

[0038] A method for preparing a double-network hydrogel strain sensing patch with electrical conductivity, the specific preparation process includes the following steps:

[0039] ① Preparation of polyvinyl alcohol single-network hydrogel embedded with CMC and monomer Py: mix the PVA solution (10.5 mL) with a concentration of 0.15 g / mL and the CMC solution (5.5 mL) with a concentration of 0.05 g / mL , and keep the solution temperature at 95°C, magnetic stirring to mix the two evenly, add 200 μL of HCl solution with a concentration of 20% to the mixed solution, adjust the pH to 4.0, and then add pyrrole (Py) with a concentration of 1.0mol / L The solution was 0.5 mL and stirred for 30 min. After the solution was uniformly mixed, an aqueous solution of glutaraldehyde (0.38 mL) with a concentration of 5.0 mg / mL (0.38 mL) was added, stirred evenly, and the mixed solution was poured into a mold and reacted in a water bath at 60°C for 50 min to obtain the Polyvinyl alcohol single networ...

Embodiment 3

[0043] The preparation process is the same as in Example 1. This example provides PPy / CMC-Fe prepared under different pyrrole concentrations. 3+ / PVA composite hydrogel, and its performance was tested, such as image 3 , Figure 4 shown. The pyrrole concentrations were 0mol / L, 0.2mol / L, 0.4mol / L, 0.6mol / L, 0.8mol / L, and 1.0mol / L, respectively.

[0044] Determination of prepared PPy / CMC-Fe with Instron3343 3+ / PVA composite hydrogel mechanical properties (Instron3343: USA, loading rate: 30mm / min). Determination of the prepared polypyrrole / sodium carboxymethylcellulose-Fe with Keithley 2400 digital source meter 3+ / PVA composite hydrogel under different strains and actual application conditions (R), and convert it to the change rate of resistance (R-R 0 / R 0 ×100%).

[0045] image 3 It is the obtained PPy / CMC-Fe prepared under the conditions of the pyrrole concentration of 0mol / L, 0.2mol / L, 0.4mol / L, 0.6mol / L, 0.8mol / L and 1.0mol / L respectively 3+ / PVA composite hydrog...

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Abstract

The invention discloses a composite hydrogel, a preparation method and application thereof. The preparation method includes: firstly, blending polyvinyl alcohol (PVA), sodium carboxymethyl cellulose (CMC) and monomer pyrrole (Py), and then taking glutaraldehyde as the cross-linking agent to prepare CMC and Py embedded polyvinyl alcohol single-network hydrogel under an acidic condition, then at a low temperature, soaking the obtained single-network hydrogel in an FeCl3 solution of appropriate concentration to obtain polypyrrole / sodium carboxymethyl cellulose-Fe<3+> / polyvinyl alcohol (PPy / CMC-Fe<3+> / PVA) double-network composite hydrogel. By applying the composite hydrogel to a strain sensing patch, finally a composite hydrogel strain sensing patch with high mechanical strength, elasticity,conductivity and strain sensitivity can be obtained. The invention opens up a new way for in-situ synthesis of polypyrrole in hydrogel, and provides a new idea and new method for application of a hydrogel strain sensor in wearable field.

Description

technical field [0001] The invention relates to a composite hydrogel and its preparation method and application, in particular to a preparation method of a double network structure composite hydrogel doped with a conductive material (polypyrrole) by an in-situ oxidation method, and the Composite hydrogels with high mechanical strength, elasticity, conductivity, and strain sensitivity are applied to strain-sensing patches. Background technique [0002] Sensors are the core components of wearable devices, and their functionalization determines the development of wearable devices. The strain sensor has electrical characteristics that can be changed repeatedly with mechanical deformation and a sensing sensitivity similar to that of human skin, and is expected to be applied in biomechanical research, human health monitoring, and embedded therapeutic sensing. As a substance composed of a large amount of water and a three-dimensional polymer network, polymer hydrogel has the softn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L1/28C08L79/04C08K5/07C08K3/16C08J3/24C08J3/075C08G73/06A61B5/024
CPCA61B5/024A61B5/02444A61B5/6833C08G73/0611C08J3/075C08J3/246C08J2329/04C08J2401/28C08J2479/04C08K3/16C08K5/07
Inventor 王景辉薛雅楠丁露张雪慧严达祥王艳芹武晓刚朱亚萍安美文陈维毅
Owner TAIYUAN UNIV OF TECH
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