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Preparation method of high-conductivity and high-sensitivity polyvinyl alcohol-based conductive hydrogel

A conductive hydrogel, polyvinyl alcohol-based technology, applied in the field of material science, can solve the problems of poor mechanical strength, low conductivity and low sensing sensitivity of conductive hydrogel, and achieve improved mechanical strength, high sensitivity, and high conductivity rate effect

Active Publication Date: 2021-10-19
JILIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to effectively solve the technical bottlenecks of poor mechanical strength, low electrical conductivity and sensing sensitivity of the existing conductive hydrogels, based on the optimized synthesis process parameters of the present invention, and establish a polyvinyl alcohol compound by freeze-thaw cycle method. Strong physical cross-linking network formed by hydrogen bond with sodium lignosulfonate to prepare conductive hydrogel matrix material with high mechanical strength

Method used

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  • Preparation method of high-conductivity and high-sensitivity polyvinyl alcohol-based conductive hydrogel
  • Preparation method of high-conductivity and high-sensitivity polyvinyl alcohol-based conductive hydrogel
  • Preparation method of high-conductivity and high-sensitivity polyvinyl alcohol-based conductive hydrogel

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Embodiment 1

[0035] The synthesis process of the matrix material and the feasibility of the conductive process were determined by analyzing the morphology, phase and mechanical properties of the silver layer on the surface of polyvinyl alcohol-sodium lignosulfonate conductive hydrogel.

[0036] see figure 1 Stress-strain diagrams of matrix materials with different sodium lignosulfonate contents shown, figure 2 The ultimate tensile stress and Shore hardness diagram of the shown polyvinyl alcohol-sodium lignosulfonate conductive hydrogel, image 3 The silver layer distribution and energy spectrum of polyvinyl alcohol-sodium lignosulfonate conductive hydrogel shown, Figure 4 The morphology and enlargement of the silver layer of the polyvinyl alcohol-sodium lignosulfonate conductive hydrogel, Figure 5 The interface between the silver layer and the matrix of the polyvinyl alcohol-sodium lignosulfonate conductive hydrogel and the enlarged picture and Figure 6 The phase diagram of the silv...

Embodiment 2

[0039] By analyzing the resistance, linearity, sensitivity gauge factor and signal detection performance of polyvinyl alcohol-sodium lignosulfonate conductive hydrogel, the synthesis process of the matrix material and the effectiveness of the conductive process were determined.

[0040] see Figure 7 The electrical resistance distribution figure of the shown polyvinyl alcohol-sodium lignosulfonate conductive hydrogel, Figure 8 The sensitivity gauge factor and linearity diagram of the polyvinyl alcohol-sodium lignosulfonate conductive hydrogel shown, Figure 9 ΔR / R of the shown polyvinyl alcohol-sodium lignosulfonate conductive hydrogel under 1% cyclic strain for 100 cycles 0 change chart, Figure 10 The polyvinyl alcohol-sodium lignosulfonate conductive hydrogel is shown to detect the vocalization signals of the throat of different people and Figure 11 The shown polyvinyl alcohol-sodium lignosulfonate conductive hydrogel detects pulse beating signal diagram.

[0041] Bas...

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Abstract

The invention relates to a preparation method of high-conductivity and high-sensitivity polyvinyl alcohol-based conductive hydrogel, which is characterized in that polyvinyl alcohol-sodium lignin sulfonate hydrogel with a high mechanical strength characteristic is used as a matrix material, and on the basis of the adsorption characteristic of a microphase separation structure to silver ions, a compact silver elementary substance nano-particle layer is formed on the outer surface of the hydrogel through a reduction reaction, so that a conductive-sensing function with high conductivity, high sensitivity and high linearity is realized. According to the preparation method, the traditional conductive hydrogel preparation thought is broken through, the surface reduction silver process method and parameters of the polyvinyl alcohol-sodium lignin sulfonate conductive hydrogel are innovatively innovated, and firm combination of a silver nanoparticle layer which is uniform in size, uniform in distribution and compact and a hydrogel matrix is achieved; and the micro strain can be effectively detected and distinguished in real time, the preparation method is simple, convenient, efficient, stable, repeatable and low in cost, and an effective new thought is provided for the conductive hydrogel in the fields of electronic skin, intelligent wearable equipment, flexible sensors and the like.

Description

technical field [0001] The invention relates to the field of material science, in particular to a preparation method of polyvinyl alcohol-based conductive hydrogel with high conductivity and high sensitivity. [0002] technical background [0003] As a typical flexible material, conductive hydrogel combines the electrochemical properties of conductive polymers with the softness and biocompatibility of hydrogel, and has excellent electronic, mechanical, chemical, biological properties and other technologies. Advantages, it is an ideal material for building high-precision flexible electronic products and manufacturing technologies such as wearable electronic devices, flexible sensors, tissue engineering, and flexible robots. Therefore, conductive hydrogels have become an emerging and rapidly developing important research direction in the field of flexible electronics. [0004] Although conductive hydrogel-based flexible sensing materials have become one of the most cutting-edg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L29/04C08L97/00C08K3/08
CPCC08J3/075C08J3/246C08J2329/04C08J2497/00C08K2003/0806C08K2201/013C08K2201/001
Inventor 赵骞吴晗梁云虹任雷任露泉
Owner JILIN UNIV
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