A kind of preparation method of fatigue-repairable high-strength bilayer network hydrogel

A double-layer network, high-strength technology, applied in the field of polymer materials, can solve the problems of reduced Young's modulus, loss of high-strength hydrogels, and inability to recover chemically cross-linked structures, achieving simple preparation methods and wide selection range. Effect

Inactive Publication Date: 2016-01-20
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Secondly, the hydrogel composed of two layers of chemically cross-linked network has obvious deficiencies in stress fatigue resistance, which is manifested in the fact that when the gel is subjected to a large strain due to external force, the chemically cross-linked structure of the double network is destroyed , the Young's modulus of the hydrogel is reduced several times, and the chemical cross-linking structure cannot be restored after the external force is removed, the modulus of the hydrogel is no longer restored, and the characteristics of high-strength hydrogel are lost

Method used

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  • A kind of preparation method of fatigue-repairable high-strength bilayer network hydrogel

Examples

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Embodiment 1

[0029] A method for preparing a fatigue-repairable high-strength double-layer network hydrogel, the preparation steps of which are as follows:

[0030] Step (1): Weigh 64g of DMSO and 21g of deionized water into a conical flask, and mix well.

[0031] Step (2): Weigh 7.6g of PVA granules into a three-necked bottle, add 55g of the mixed solvent of DMSO and water prepared in advance, and store the remaining 30g of mixed solvent of DMSO and water at 3°C ​​to 5°C for later use. Connect the water bath device and the stirring device, the temperature of the water bath is 95°C, and stir rapidly for 2.5 hours with nitrogen gas.

[0032] Step (3): Weigh 12.32g of acrylamide (AAm), 0.0025g of 2-ketoglutaric acid (KA), 0.0080g of N.N'-methylenebisacrylamide (MBAA) and dissolve in the remaining 30g of DMSO and In the mixed solvent of water, keep away from light.

[0033] Step (4): After the PVA particles are completely dissolved, remove the water bath, continue stirring for about 30 minu...

Embodiment 2

[0039] A method for preparing a low-temperature self-repairing high-strength double-layer network hydrogel, the preparation steps of which are as follows:

[0040] Step (1): Weigh 64g of DMSO and 21g of deionized water into a conical flask, and mix well.

[0041]Step (2): Weigh 4.5g of PVA granules into a three-neck bottle, add 45g of the mixed solvent of DMSO and water prepared in advance, and store the remaining mixed solvent of DMSO and water at 3°C ​​to 5°C for later use. A water bath device and a stirring device were connected to the three-necked bottle, the temperature of the water bath was 95° C., and the nitrogen gas was passed through and stirred rapidly for about 2 hours.

[0042] Step (3): Weigh 12.32g of AAm, 0.0025g of KA, and 0.0080g of MBAA, dissolve them in the remaining 40g of mixed solvent of DMSO and water, and store them away from light.

[0043] Step (4): After the PVA particles are completely dissolved, remove the water bath, continue stirring with nitro...

Embodiment 3

[0048] A method for preparing a low-temperature self-repairing high-strength double-layer network hydrogel, the preparation steps of which are as follows:

[0049] Step (1): Weigh 64g of DMSO and 21g of deionized water into a conical flask, and mix well.

[0050] Step (2): Weigh 7.6g of PVA particles into a three-necked bottle, add 55g of mixed solvent of DMSO and water, and place the remaining mixed solvent at 3-5°C for later use. Connect the water bath device and the stirring device, the temperature of the water bath is 95°C, and stir rapidly for about 2.5 hours with nitrogen gas.

[0051] Step (3): Weigh 12.32g of AAm, 0.0025g of KA, and 0.0080g of MBAA and dissolve them in the remaining 30g of DMSO aqueous solution.

[0052] Step (4): After the PVA particles are completely dissolved, remove the water bath, continue stirring for about 30 minutes with nitrogen gas to cool the solution to about 50°C, add the mixed solution of AAm, KA, and MBAA, and stir rapidly for 5 minutes...

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Abstract

The invention discloses a preparation method of high-strength double-layer network hydrogel capable of being subjected to fatigue repair. The preparation method comprises the following steps: firstly preparing a mixed solution of a first layer of network polymers PVA (Polyvinyl Acetate) and a second layer of network monomers, generating hydrogen bonds between PVA molecular chains by adopting a freezing-melting method so as to form a first layer of physical cross-linked networks, and then polymerizing and crosslinking the second layer of network monomers by adopting an ultraviolet-irradiation method so as to form a covalent cross-linking network, thus obtaining the double-layer network hydrogel, the two layers of networks of which are crosslinked in different ways. The preparation method of the high-strength double-layer network hydrogel, disclosed by the invention, has the advantages that the component range of the two layers of networks of the double-layer network hydrogel is expanded; after the obtained hydrogel is subjected to low temperature circulation, physical crosslinking points are capable of being subjected to fatigue repair and meanwhile the double-layer network hydrogel has the characteristic of high strength.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a preparation method of a fatigue-repairable high-strength double-layer network hydrogel. Background technique [0002] Hydrogel is composed of a body with a porous three-dimensional network structure and water filled in it. It has similar compatibility with biological tissues and high lubricating properties. Tough polymer material. [0003] Human cartilage is subject to long-term repeated high pressure and friction of joints, so higher requirements are put forward for the mechanical and lubricating properties of its substitute materials. In recent years, the mechanical and lubricating behavior of a high-strength double-layer network hydrogel has been studied in depth. The research results show that, compared with ordinary single-layer network hydrogel, this double-layer network hydrogel has a The coefficient of friction and the mechanical strength are sig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F222/38C08F2/48C08J3/00C08L29/04C08L33/24
Inventor 李学锋吴楚闫晗黄大华姜安龙余晓青易晶晶
Owner HUBEI UNIV OF TECH
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