High-strength strain-sensitive polyvinyl alcohol ion hydrogel sensing material, and preparation method and application thereof

A technology of polyvinyl alcohol and sensing materials, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement devices, etc., can solve the problems of poor strength, toughness and strain sensitivity, and achieve the improvement of mechanical properties and high strain sensitivity coefficient Effect

Active Publication Date: 2019-09-20
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned problems or defects in the prior art, the object of the present invention is to provide a high-strength and strain-sensitive polyvinyl alcohol ionic hydr...

Method used

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  • High-strength strain-sensitive polyvinyl alcohol ion hydrogel sensing material, and preparation method and application thereof
  • High-strength strain-sensitive polyvinyl alcohol ion hydrogel sensing material, and preparation method and application thereof
  • High-strength strain-sensitive polyvinyl alcohol ion hydrogel sensing material, and preparation method and application thereof

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Embodiment 1

[0035] The preparation method of a polyvinyl alcohol ion PVA-Glycerol-NaCl (PGN) high-strength hydrogel sensing material of the present embodiment comprises the following steps:

[0036] (1) Add 2.4g of 1797 type polyvinyl alcohol (PVA) to 20g of a mixed solvent composed of deionized water and glycerol (Glycerol), then stir at 100°C for 2.5h to completely dissolve the polyvinyl alcohol to obtain PVA-Glycerol mixed solution; wherein: the mass ratio of deionized water and glycerin is 4:6.

[0037] (2) Transfer the PVA-Glycerol mixed solution obtained in step (1) to a cylindrical mold, and cool it at -20°C for 12 hours, take it out after the cold treatment, and thaw it at room temperature for 3 hours to obtain the PVA-Glycerol hydrogel Glue; Wherein: described cylinder mold height is 50mm, and bottom surface diameter is 3.5mm.

[0038] (3) The PVA-Glycerol hydrogel obtained in step (2) was fully soaked in a saturated sodium chloride (NaCl) solution for 2 hours to obtain a PVA-Gl...

Embodiment 2

[0040] The preparation method of a polyvinyl alcohol ion PVA-Glycerol-NaCl (PGN) high-strength hydrogel sensing material of the present embodiment comprises the following steps:

[0041](1) Add 3g of 1797-type polyvinyl alcohol (PVA) to 36g of a mixed solvent composed of deionized water and glycerol (Glycerol), and then stir at 95°C for 2.5h to completely dissolve the polyvinyl alcohol to obtain PVA - Glycerol mixed solution; wherein: the mass ratio of deionized water and glycerin is 7:3.

[0042] (2) Transfer the PVA-Glycerol mixed solution obtained in step (1) to a cylindrical mold, and cool it at -20°C for 15 hours, take it out after the cold treatment, and thaw it at room temperature for 2 hours to obtain the PVA-Glycerol hydrogel Glue; Wherein: described cylinder mold height is 50mm, and bottom surface diameter is 3.5mm.

[0043] (3) The PVA-Glycerol hydrogel obtained in step (2) was fully soaked in a saturated sodium chloride (NaCl) solution for 2 hours to obtain a PVA-...

Embodiment 3

[0045] The preparation method of a polyvinyl alcohol ion PVA-Glycerol-NaCl (PGN) high-strength hydrogel sensing material of the present embodiment comprises the following steps:

[0046] (1) Add 6g of 1797-type polyvinyl alcohol (PVA) to 50g of a mixed solvent composed of deionized water and glycerol (Glycerol), and then stir at 100°C for 4 hours to completely dissolve the polyvinyl alcohol to obtain PVA- Glycerol mixed solution; wherein: the mass ratio of the deionized water and glycerin is 3:7;

[0047] (2) Transfer the PVA-Glycerol mixed solution obtained in step (1) to a cylindrical mold, and cool it at 0°C for 24 hours, take it out after the cold treatment, and thaw it at room temperature for 2 hours to obtain a PVA-Glycerol hydrogel ; Wherein: the height of the cylinder mold is 50mm, and the diameter of the bottom surface is 3.5mm.

[0048] (3) The PVA-Glycerol hydrogel obtained in step (2) was fully soaked in a saturated sodium chloride (NaCl) solution for 4 hours to o...

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Abstract

The invention relates to a high-strength strain-sensitive polyvinyl alcohol ion hydrogel sensing material, and a preparation method and application thereof. The hydrogel is obtained by fully mixing polyvinyl alcohol with glycerin and deionized water while stirring under strict temperature control conditions, and soaking the mixture in a saturated sodium chloride solution after low temperature treatment. The low temperature treatment promotes formation of a large number of hydrogen bonds between the PVA and the glycerin, and the soaking treatment by the saturated sodium chloride solution promotes entanglement among PVA chains, and interaction between two physical effects of hydrogen bonding and chain entanglement remarkably improves mechanical properties of the hydrogel. Since Na+ and Cl- ions exist in the hydrogel, a hydrogel sensor has a high sensitivity coefficient and can repeatedly and stably detect changes of electrical signals. The synthesis process of the hydrogel sensor is simple to operate and easy to control, raw materials are cheap and easy to obtain and have high biocompatibility and nontoxicity, and a wearable device produced from the hydrogel sensor can safely and effectively monitor the movement of each part of the human body.

Description

technical field [0001] The invention belongs to the technical field of smart materials, and in particular relates to a composite hydrogel sensing material and its preparation method and application. Sensitive materials and their preparation methods and applications in sensors. Background technique [0002] Polyvinyl alcohol (PVA) is one of the synthetic biodegradable polymers that has been commercially produced on a large scale. Polyvinyl alcohol (PVA) hydrogels have been widely studied and considered to be one of the most suitable hydrogels for biomedical applications, such as soft tissue substitutes and wearable devices, due to their non-toxicity and biocompatibility. However, the high loading capacity of most PVA hydrogels is unqualified, and the generally low mechanical properties limit the wide application of PVA hydrogels. Ionic hydrogels are intrinsically strong and conductive materials widely used in soft electronics, such as sensors and actuators. Therefore, the ...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L29/04G01B7/16
CPCC08J3/075C08J2329/04G01B7/18
Inventor 张玉红潘申鑫孙争光詹园何培新
Owner HUBEI UNIV
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