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A kind of polyvinyl alcohol-tannic acid-boric acid ternary cross-linked hydrogel, preparation method and application

A technology of cross-linked hydrogel and polyvinyl alcohol, which is applied in prosthesis, tissue regeneration, medical science, etc., can solve the problems of unfriendly environment, long time, poor self-healing performance, etc., and achieve simple process and easy operation Effect

Active Publication Date: 2021-04-20
XIAMEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing self-healing conductive hydrogels, there are still some problems that cannot be ignored, such as insufficient mechanical strength, poor self-healing performance, and inconvenient preparation methods, etc.
Most of the polymer hydrogels show poor resilience performance, which is reflected in the long deformation recovery time and large hysteresis circle in the stress-strain curve of cyclic compression, resulting in poor self-healing performance and long time
In addition, the preparation of most self-healing hydrogels has high toxicity, is not friendly to the environment, and is greatly limited in the field of application.

Method used

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  • A kind of polyvinyl alcohol-tannic acid-boric acid ternary cross-linked hydrogel, preparation method and application
  • A kind of polyvinyl alcohol-tannic acid-boric acid ternary cross-linked hydrogel, preparation method and application
  • A kind of polyvinyl alcohol-tannic acid-boric acid ternary cross-linked hydrogel, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Dissolve 0.1 g of tannic acid, 0.1 g of boric acid, and 0.2 g of potassium hydroxide in 8.5 g of deionized water, oscillate ultrasonically, and stir in an oil bath at 90° C. for 15 min to obtain a brown solution. Then slowly add 1.0g PVA and 0.1g potassium chloride in an oil bath at 90℃, and stir for 2h. A brown hydrogel was obtained after cooling.

[0030] Such as Figure 4 , the ternary cross-linked hydrogel prepared in this example realizes effective self-repair within 30s; as Figure 5 , the original shape (a) of the ternary cross-linked hydrogel prepared in this example, after being fixed with a mold at room temperature for 30 minutes (b), the sample shape (c) returned to room temperature by heating in a water bath at 80°C. Such as Figure 6 , the ternary cross-linked hydrogel prepared in this example has dynamic covalent cross-linking and physical cross-linking structure, and there are reversible borate bonds and hydrogen bonds, and the hydrogen bonds include h...

Embodiment 2

[0032] Dissolve 0.2 g of tannic acid, 0.1 g of boric acid, and 0.2 g of potassium hydroxide in 8.4 g of deionized water, oscillate ultrasonically, and stir in an oil bath at 50° C. for 45 min to obtain a brownish-yellow solution. Then slowly add 1.0g PVA and 0.1g potassium chloride in an oil bath at 90℃, and stir for 5h. A brown hydrogel was obtained after cooling.

Embodiment 3

[0034] Dissolve 0.4g of tannic acid, 0.1g of boric acid, and 0.2g of potassium hydroxide in 8.2g of deionized water, oscillate ultrasonically, and stir in an oil bath at 60°C for 30min to obtain a brownish-yellow solution. Then slowly add 1.0g PVA and 0.1g potassium chloride in 90℃ oil bath, and stir for 3h. A tan hydrogel was obtained after cooling.

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PUM

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Abstract

The invention discloses a polyvinyl alcohol-tannic acid-boric acid ternary crosslinked hydrogel, a preparation method and an application. Polyvinyl alcohol, tannic acid, boric acid, potassium hydroxide and potassium chloride are used as raw materials, and the cross-linked hydrogel is obtained by means of condensation reaction between boric acid and adjacent hydroxyl groups. The synthesis method has the advantages of simple process, mild conditions, easy operation, and no post-treatment of the product. Shape memory hydrogels with different self-healing ability and mechanical strength can be obtained by changing the dosage of polyvinyl alcohol, tannic acid, boric acid, potassium hydroxide and potassium chloride. The self-healing shape memory hydrogel has potential applications in soft robots, artificial ligaments, flexible devices, and automotive smart sensing materials.

Description

technical field [0001] The invention relates to the field of functional polymers, and relates to a polyvinyl alcohol-tannic acid-boric acid ternary crosslinked hydrogel, a preparation method and an application. Background technique [0002] The mechanical properties of traditional hydrogels tend to decline a lot after being traumatized. And due to the existence of cracks, the internal structure of the hydrogel will be gradually destroyed, resulting in the loss of function and the reduction of the life of the hydrogel. Hydrogels with self-healing function can repair internal cracks spontaneously or under external stimuli to restore structure and function when they are damaged, thereby prolonging their service life. This self-healing hydrogel has broad application prospects in artificial ligaments, flexible electronic devices and other fields. [0003] In the existing self-healing conductive hydrogels, there are still some problems that cannot be ignored, such as insufficien...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/24C08J3/075A61L27/18C08L29/04
CPCA61L27/18A61L2430/10C08J3/075C08J3/24C08J2329/04
Inventor 袁丛辉黄俊文戴李宗杨杰柳君蔡其鹏杨羽歆彭超华刁雪峰陈国荣
Owner XIAMEN UNIV
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