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Preparation method of high-strength and high-tension ionic conductive hydrogel

A technology of ion conduction and hydrogel, applied in the fields of batteries, supercapacitors, and sensors, can solve the problems of portable, wearable devices, and poor mechanical properties of electrolytes, and achieve increased ion conductivity, good conductivity, and mechanical properties good effect

Active Publication Date: 2019-12-13
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the pH value of the existing conductive hydrogel is alkaline and the mechanical properties of the neutral polymer electrolyte are poor, and it is difficult to meet the needs of portable and wearable devices, the invention provides a method for preparing a high-strength and high-stretch ion-conductive hydrogel , by compounding with locust bean gum, the two polymers form a polymer network and are interconnected by hydrogen bonds, which can significantly improve the mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The preparation method of the high-strength and high-stretch ion-conducting hydrogel of this embodiment, the steps are as follows:

[0020] (1) Dissolve 10g of polyvinyl alcohol, 3g of locust bean gum and 0.05mol of potassium hydroxide in 100g of water at 100°C, gradually add 0.05g of titanium dioxide, and stir for 4 hours to form a uniform and stable solution;

[0021] (2) The solution obtained in step (1) was frozen at -20°C for 10 h, and then thawed at 4°C for 2 h, as a freeze-thaw cycle, and the ion-conductive hydrogel was obtained after 6 cycles.

[0022] The electrical conductivity of the obtained ion-conductive hydrogel was 0.022 S / cm, the tensile strength was 0.31 MPa, and the elongation at break was 4.6 mm / mm.

Embodiment 2

[0024] The preparation method of the high-strength and high-stretch ion-conducting hydrogel of this embodiment, the steps are as follows:

[0025] (1) Dissolve 15g of polyvinyl alcohol, 1.5g of locust bean gum and 0.6mol of sodium sulfate in 100g of water at 85°C, gradually add 1.5g of silicon dioxide, and stir for 3 hours to form a uniform and stable solution;

[0026] (2) The solution obtained in step (1) was frozen at -20°C for 24h, and then thawed at 20°C for 6h, as a freeze-thaw cycle, and the ion-conductive hydrogel was obtained after 10 cycles.

[0027] The conductivity of the obtained ion-conductive hydrogel was 0.12 S / cm, the tensile strength was 0.6 MPa, and the elongation at break was 6.7 mm / mm.

Embodiment 3

[0029] The preparation method of the high-strength and high-stretch ion-conducting hydrogel of this embodiment, the steps are as follows:

[0030] (1) Weigh 20g of polyvinyl alcohol, 2g of locust bean gum and 0.3mol of potassium chloride in 100g of water at 95°C, and gradually add 4g of lithium aluminum silicate, and stir for 3.5h to form a uniform and stable solution.

[0031] (2) The solution obtained in step (1) was frozen at -18°C for 20h, and then thawed at 30°C for 4h, as a freeze-thaw cycle, and the ion-conductive hydrogel was obtained after one cycle.

[0032] The electrical conductivity of the obtained ion-conductive hydrogel was 0.063 S / cm, the tensile strength was 0.08 MPa, and the elongation at break was 2.2 mm / mm.

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Abstract

The invention discloses a preparation method of a high-strength and high-tension ionic conductive hydrogel. The method comprises the following steps: (1) weighing certain amounts of polyvinyl alcohol,Sophora bean gum and a conductive ion source compound, dissolving the above components in water at 85-100 DEG C under a continuous stirring condition, gradually adding inorganic particles, and continuously performing stirring until a uniform and stable solution is formed; and (2) freezing the solution obtained in step (1) at -20 DEG C for 10-24 h, then unfreezing the frozen solution at 4-30 DEG Cfor 2-6 h, and repeating the above freezing-unfreezing cycle for 1-10 times to obtain the ionic conductive hydrogel. Two polymers are compounded with the Sophora bean gum to form a high-molecular network, and interconnection using hydrogen bonds can remarkably improve the mechanical properties. The conductive hydrogel with good mechanical properties and good electric conductivity can be obtainedby the simple blending method. The method has the advantages of simplicity in operation, low cost of raw materials and low processing cost.

Description

technical field [0001] The invention relates to a preparation method of a high-strength and high-stretch ion-conducting hydrogel, which can be used in the fields of batteries, supercapacitors, sensors and the like. Background technique [0002] Hydrogel is a type of soft material composed of cross-linked polymers that can swell in water but cannot be dissolved and water molecules wrapped in it. This type of soft material has high water content, large porosity, and good biocompatibility. Advantage. From the analysis of the chemical structure of the hydrogel, the polymer network contains hydrophilic groups and hydrophobic groups, in which the hydrophilic groups combine with water molecules by means of hydrogen bonds to fix the water molecules inside the network structure, while Hydrophobic groups swell when exposed to water, so hydrogels can absorb and store large amounts of water to maintain a certain shape. Hydrogels are soft in shape and maintain a specific shape, can abs...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L29/04C08L5/00C08K3/22C08K3/36C08K3/34C08K3/30C08K3/16C08K3/28
CPCC08J3/075C08J2329/04C08J2405/00C08K2003/2227C08K2003/2241C08K3/36C08K3/34C08K3/346C08K2003/2244C08K2003/2203C08K2003/3045C08K2201/011C08K2201/001
Inventor 秦刚范利丹杨佳王一杰张达方潇焓
Owner HENAN POLYTECHNIC UNIV
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