Self-healing hydrogel and preparation method thereof

A hydrogel and self-healing technology, applied in the field of self-healing hydrogel and its preparation, can solve problems such as lack of self-healing properties, achieve good self-healing effect, simple healing conditions, and super mechanical performance effect

Active Publication Date: 2019-08-09
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most gel materials do not have self-healing properties, and some materials will also undergo self-healing reactions under the stimulation of the external environment (light, temperature, humidity, pH, etc.), so that the mechanical properties of the material can be restored, but the external environment Conditions are generally difficult to meet the requirements of these materials

Method used

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  • Self-healing hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Firstly, 3 g of isopropylacrylamide, 10 mL of water, and 20 mL of nano-silica sol were uniformly mixed, stirred for 10 min, and ultrasonicated for 30 min to uniformly disperse the nano-silica particles in the solution. Add 80 mg of ammonium persulfate and 150 μL of N,N,N,N-tetramethylethylenediamine, and stir until the solution is uniform and stable. Stand in an oven at 60°C for 30 minutes, then soak in 1mol / L sodium hydroxide solution, and stir gently to fully soak and strengthen the material. Compress the cross-linked gel in a mold. After drying at room temperature for 15 days, a self-healing hydrogel with super-strong mechanical properties was obtained. Such as figure 1 As shown, the self-healing hydrogel was subjected to a shear test using a universal compression testing machine, and the section was soaked in 75% ethanol solution, and after splicing together, it was dried at room temperature for 15 days. A universal testing machine was used to test the shear stre...

Embodiment 2

[0021] Firstly, 3g of isopropylacrylamide, 10mL of water, and 15mL of nano-silica sol were uniformly mixed, stirred for 10 minutes, and ultrasonicated for 30 minutes to evenly disperse the nano-silica particles in the solution. Add 60 mg of ammonium persulfate and 150 μL of N,N,N,N-tetramethylethylenediamine, and stir until the solution is uniform and stable. Stand in an oven at 60°C for 30 minutes. Take out the sample, soak it in 1mol / L sodium hydroxide solution to obtain the colloid, then extrude the colloid into a mold, and dry it at room temperature for 10-15 days to obtain a self-healing hydrogel with super strong mechanical properties. Such as figure 1 As shown, the above self-healing hydrogel was subjected to a shear test using a universal compression testing machine, and the section was soaked in 75% ethanol solution, and after being spliced ​​together, it was dried at room temperature for 15 days. A universal testing machine was used to test the shear stress of the ...

Embodiment 3

[0023] Firstly, 3g of isopropylacrylamide, 15mL of water, and 15mL of nano-silica sol were uniformly mixed, stirred for 10 minutes, and ultrasonicated for 30 minutes to uniformly disperse the nano-silica particles in the solution. Add 60 mg of ammonium persulfate and 150 μL of N,N,N,N-tetramethylethylenediamine, and stir until the solution is uniform and stable. Stand in an oven at 60°C for 30 minutes. Take out the sample, soak it in 1mol / L sodium hydroxide solution to obtain the colloid, then extrude the colloid into a mold, and dry it at room temperature for 10-15 days to obtain a self-healing hydrogel with super strong mechanical properties. Such as figure 1 As shown, the above self-healing hydrogel was subjected to a shear test using a universal compression testing machine. The cross-section was soaked in an aqueous solution, and after being spliced ​​together, it was dried at room temperature for 15 days. A universal testing machine was used to test the shear stress of ...

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Abstract

The invention discloses a self-healing hydrogel and a preparation method thereof. The self-healing hydrogel is prepared from an acrylamide monomer, deionized water, a crosslinker, persulfide and N,N,N,N-tetramethylethylenediamine according to a ratio of (2-4) g:(10-20) mL:(10-20) mL:(80-100) mg:(150-200) [mu]L, and also includes an appropriate amount of a hydrophobizing reagent. The deionized water is used as a solvent, so the prepared hydrogel material still has superior mechanical properties after being dried, also has a good self-healing effect and a simple healing condition, and has far-reaching significance in the field of self-healing high-strength gel materials.

Description

technical field [0001] The invention belongs to the technical field of hydrogel preparation, and in particular relates to a self-healing hydrogel and a preparation method thereof. Background technique [0002] Hydrogel is a kind of gel material formed by reactions such as polymerization using water as a solvent. Ordinary hydrogels are mostly soft and elastic because they are rich in water, and they shrink and become brittle after losing water. Many hydrogel materials will crack or even break after being applied for a period of time, especially after drying. Self-healing is one of the important properties of gel materials. If the material itself has certain self-healing properties, it can heal itself and remain intact. Most gel materials do not have self-healing properties, and some materials will also undergo self-healing reactions under the stimulation of the external environment (light, temperature, humidity, pH, etc.), so that the mechanical properties of the material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/54C08F2/10C08F2/44C08K3/36
CPCC08F2/10C08F2/44C08F120/54C08K3/36C08K2201/003C08K2201/011
Inventor 何宁汪一鸣林凌袁元敏
Owner XIAMEN UNIV
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