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Preparation method of a pH-induced self-healing nanocomposite hydrogel

A nanocomposite and hydrogel technology, applied in the field of nanomaterials, can solve the problems of long repair time and low repair efficiency, and achieve the effects of excellent mechanical properties, excellent anti-crack sensitivity, and good self-healing ability.

Active Publication Date: 2018-11-20
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these repair methods have low repair efficiency and long repair time, and are not suitable for high-strength hydrogels

Method used

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  • Preparation method of a pH-induced self-healing nanocomposite hydrogel
  • Preparation method of a pH-induced self-healing nanocomposite hydrogel
  • Preparation method of a pH-induced self-healing nanocomposite hydrogel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: Preparation of metal nanomaterial dispersion liquid

[0036] 1. Mix 0.13g soluble starch, 0.05g L-lysine and 8mL deionized water evenly and add them into the microwave reactor, then add 8mL of 0.2M copper nitrate solution, mix well and put them into the microwave reactor, 140 React at °C for 20 minutes; after the reaction, cool naturally, wash with distilled water and ethanol in turn, centrifuge, and disperse into an aqueous solution to obtain a metal nanomaterial dispersion with a particle shape.

[0037] 2. Add 5.86g of PVP to 190mL of glycerol, stir and heat up to 90°C until the PVP is completely dissolved, add 1.58g of copper nitrate solution after cooling to 50°C, and add 10mL of glycerin with 59mg of sodium chloride dissolved in it completely Alcohol solution, heated to 210°C with stirring, stopped heating, added 200mL of water, cooled to room temperature and stood for a week, washed with ethanol and centrifuged, dispersed in aqueous solution to obta...

Embodiment 2

[0040] 1. Surface modification of metal nanomaterials

[0041] Mix the 0.36 mg / mL metal nanomaterial dispersion with particle shape prepared in Step 1 of Example 1 with the functional modifier allylthiol whose mass is 0.02% of the mass of the metal nanomaterial dispersion, and stir at room temperature for 10 minutes. obtaining a surface-modified metal nanomaterial dispersion;

[0042] 2. Dissolution of raw materials

[0043] Under the protection of nitrogen, the hydrophilic monomer acrylic acid and the photoinitiator 2-hydroxyl-4'-(2-hydroxyethoxy)-2-methylpropiophenone are added to the surface-modified metal nanomaterial dispersion obtained in step 1 In, after stirring and dissolving, place it in a vacuum drying oven to remove dissolved oxygen in the solution; the added mass of the hydrophilic monomer is 10% of the quality of the metal nanomaterial dispersion; the added mass of the photoinitiator is 10% of the metal nanomaterial dispersion. 0.0001% of the mass; the flow rat...

Embodiment 3

[0047] 1. Surface modification of metal nanomaterials

[0048] Mix the 0.28 mg / mL metal nanomaterial dispersion with a particle shape prepared in Step 1 of Example 1 with the functional modifier allylthiol whose mass is 0.02% of the mass of the metal nanomaterial dispersion, and stir at room temperature for 10 minutes. obtaining a surface-modified metal nanomaterial dispersion;

[0049] 2. Dissolution of raw materials

[0050] Under the protection of nitrogen, the hydrophilic monomer acrylic acid and the photoinitiator 2-hydroxyl-4'-(2-hydroxyethoxy)-2-methylpropiophenone are added to the surface-modified metal nanomaterial dispersion obtained in step 1 In, after stirring and dissolving, place it in a vacuum drying oven to remove dissolved oxygen in the solution; the added mass of the hydrophilic monomer is 10% of the quality of the metal nanomaterial dispersion; the added mass of the photoinitiator is 10% of the metal nanomaterial dispersion. 0.0001% of the mass; the flow r...

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Abstract

The invention discloses a method for preparing pH-induced self-healing nano composite hydrogel. Metal and sulfur strong dynamic coordination bonds serve as a healing mechanism, monomers are subjected to a uniform polymerization reaction in the polymerization process to generate a uniform and stable gel network structure, and accordingly the hydrogel has excellent mechanical properties and notch sensitivity resistance, that is, the hydrogel has good stress strain and still has good stress strain when cracks are generated under external force. The principle that metal and sulfur are different in coordination strength under different pH conditions is used, when the pH value of the environment changes, the coordination bonds between metal and sulfur are dynamically bonded and broken, and accordingly interface reconstruction happens to the surface of the broken hydrogel so that the self-healing aim can be achieved.

Description

technical field [0001] The invention relates to a preparation method of a pH-induced self-healing nanocomposite hydrogel, belonging to the technical field of nanomaterials. Background technique [0002] Hydrogel is a water-soluble polymer that cross-links water-soluble polymer chains into a network structure through chemical or physical cross-linking methods, and connects water molecules inside the network; as a soft material with water as the dispersion medium, It is similar to biological tissue, so it is widely used in the fields of biomedicine, sensors and tissue engineering; compared with other types of polymer materials, hydrogel has the ability to respond to external stimuli; The cross-linking agent used in the process of forming the network structure is a small chemical molecule. Random polymerization occurs during the polymerization process, resulting in poor dispersion of cross-linking points and forming an irregular network structure. Under the action of external f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/06C08F120/56C08F2/48C08F2/44C08K9/04C08K3/08
CPCC08F2/44C08F2/48C08F120/06C08F120/56C08K3/08C08K9/04C08K2003/0806C08K2003/085C08K2201/011
Inventor 秦海利从怀萍张坦
Owner HEFEI UNIV OF TECH