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A high-strength and strain-sensitive polyvinyl alcohol ion hydrogel sensing material and its preparation method and application

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

Active Publication Date: 2021-09-10
合肥龙智机电科技有限公司
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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 hydrogel sensing material and its preparation method and application, which solves the problem of existing PVA hydrogels. Technical issues such as poor sensor strength, toughness and strain sensitivity

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  • A high-strength and strain-sensitive polyvinyl alcohol ion hydrogel sensing material and its preparation method and application
  • A high-strength and strain-sensitive polyvinyl alcohol ion hydrogel sensing material and its preparation method and application
  • A high-strength and strain-sensitive polyvinyl alcohol ion hydrogel sensing material and its preparation method and application

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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 glycerol 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 and strain-sensitive polyvinyl alcohol ion hydrogel sensing material, a preparation method and application thereof. The hydrogel is obtained by stirring and mixing polyvinyl alcohol, glycerin and deionized water under strict temperature control, and soaking in saturated sodium chloride solution after low-temperature treatment. Among them, the low temperature treatment promoted the formation of a large number of hydrogen bonds between PVA and glycerol, and the soaking treatment in saturated sodium chloride solution promoted the entanglement between the PVA chains. The two physical effects of hydrogen bonds and chain entanglements cooperated to make the hydrogel The mechanical properties are greatly improved. In addition, due to the presence of Na in the hydrogel + and Cl ‑ ions, the hydrogel sensor has a high sensitivity coefficient and can repeatedly and stably detect changes in electrical signals. The synthesis process of the hydrogel sensor is simple and easy to control, and the raw materials are cheap and easy to obtain, and all have good biocompatibility and non-toxicity. It can be prepared into a wearable device that can safely and effectively monitor the movement of various parts 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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Patent Type & Authority Patents(China)
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 合肥龙智机电科技有限公司
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