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Preparation method of PAM/PVP/PAA triple-network hydrogel

A hydrogel and network technology, which is applied in the field of preparation of PAM/PVP/PAA triple network hydrogel, can solve the problems of hydrogel permanent damage, poor fatigue resistance, etc., and achieve stable mechanical properties and equipment performance, Mild reaction conditions and good self-healing effect

Inactive Publication Date: 2020-09-29
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the existence of irreversible covalent bonds, when the network structure formed by chemical crosslinking is broken, it will cause permanent damage and poor fatigue resistance of the hydrogel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Accurately weigh 6.39g acrylamide (AM), 1.278g acrylic acid (AA), 0.17496g ferric chloride hexahydrate, 0.639g polyvinylpyrrolidone (PVP) and dissolve it in 20mL deionized water at room temperature to form a uniform After the solution, add 30.6mg of N,N'-methylenebisacrylamide, 0.1278g of ammonium persulfate, 50uL of N,N,N',N'-tetramethylethylenediamine, and then recharge Argon gas bubbling for 10 minutes, ultrasonic treatment at low temperature for 20 minutes, and then sealed in a polytetrafluoroethylene mold, heated to 40°C, kept warm for 1 hour, and placed at room temperature for 24 hours to obtain a mold-shaped PAM / PVP / PAA three-network composite Hydrogels. The sample is made into a standard sample and then tested by a universal testing machine at room temperature. The tensile strength of the sample is 1.146MPa, the elongation at break is 524.17%, and the compressive strength is 12.230MPa (compression deformation is 76.58% ).

Embodiment 2

[0020] Accurately weigh 6.39g acrylamide (AM), 1.278g acrylic acid (AA), 0.1050g ferric chloride hexahydrate, 0.639g polyvinylpyrrolidone (PVP) and dissolve in 20mL deionized water at room temperature, and dissolve uniformly. After the solution, add 30.6mg of N,N'-methylenebisacrylamide, 0.1278g of ammonium persulfate, 50uL of N,N,N',N'-tetramethylethylenediamine, and then recharge Argon gas bubbling for 10 minutes, ultrasonic treatment at low temperature for 20 minutes, and then sealed in a polytetrafluoroethylene mold, heated to 40°C, kept warm for 1 hour, and placed at room temperature for 24 hours to obtain a mold-shaped PAM / PVP / PAA three-network composite Hydrogels. The sample is made into a standard sample and then tested by a universal testing machine at room temperature. The sample tensile strength is 0.924MPa, the elongation at break is 643.58%, and the compressive strength is 10.48MPa (compression deformation is 68.38%) ).

Embodiment 3

[0022] Accurately weigh 6.39g acrylamide (AM), 1.62g acrylic acid (AA), 0.17496g ferric chloride hexahydrate, 0.81g polyvinylpyrrolidone (PVP), dissolve in 20mL deionized water at room temperature, and dissolve to form uniform After the solution, add 30.6mg of N,N'-methylenebisacrylamide, 0.1278g of ammonium persulfate, 50uL of N,N,N',N'-tetramethylethylenediamine, and then recharge Argon gas bubbling for 10 minutes, ultrasonic treatment at low temperature for 20 minutes, and then sealed in a polytetrafluoroethylene mold, heated to 40°C, kept warm for 1 hour, and placed at room temperature for 24 hours to obtain a mold-shaped PAM / PVP / PAA three-network composite Hydrogels. The sample is made into a standard sample and then tested by a universal testing machine at room temperature. The sample tensile strength is 1.042MPa, the elongation at break is 472.33%, and the compressive strength is 8.93MPa (compression deformation 72.48%) ).

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Abstract

The invention relates to a preparation method of PAM / PVP / PAA triple-network hydrogel. The triple-network hydrogel is a cross-linked polymer interpenetrating network formed by three polymers, and the mechanical properties of gel are greatly enhanced. The preparation method of the hydrogel specifically comprises the following steps: 1) dissolving acrylamide (AM), acrylic acid (AA), ferric chloride hexahydrate and polyvinylpyrrolidone (PVP) in water in proportion, and carrying out uniform mixing; 2) sequentially adding a cross-linking agent and an initiator, carrying out argon oxygen displacementtreatment, and then adding an initiator and an accelerator, and 3) carrying out ultrasonic treatment on the obtained mixed solution, conducting reacting at 40 DEG C for 1 hour, and finally performingstanding at room temperature for 24 hours. The prepared triple-network composite hydrogel has high mechanical strength, good self-repairing performance and certain conductivity, the preparation process is simple, the raw materials are green, non-toxic and harmless, and the triple-network composite hydrogel can be applied to the aspects of medical instruments, bionic electronic skin, injectable hydrogel and the like.

Description

technical field [0001] The invention belongs to the field of hydrogel preparation, and in particular relates to a preparation method of PAM / PVP / PAA triple network hydrogel. Background technique [0002] Hydrogel is a functional polymer material with a three-dimensional network structure formed by cross-linking through chemical bonds or physical interactions. The polymer network contains a large amount of water and is soft to the touch and can maintain a certain shape. Due to their physicochemical properties, hydrogels have been widely used in the fields of cartilage substitutes, medical devices, and flexible electronics, but the further application of hydrogels is still limited by their poor mechanical properties. When traditional hydrogels are subjected to mechanical loads, local stress concentration will inevitably occur. The accumulation of local stress will cause the mesh to break, and network defects will be generated through the expansion of cracks, which will eventual...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F271/02C08F220/56C08F220/06C08F222/38C08J3/075C08L33/26C08L33/02C08L39/06
CPCC08F271/02C08J3/075C08J2333/02C08J2333/26C08J2433/02C08J2433/26C08J2439/06C08F220/56C08F220/06C08F222/385
Inventor 汪济奎严辉肖俊赵忠华周佳
Owner EAST CHINA UNIV OF SCI & TECH
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