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Stretchable self-repairing hydrogel based on dynamic covalent crosslinking agent and preparation method thereof

A covalent cross-linking and hydrogel technology, which is applied in the field of stretchable self-healing hydrogel and its preparation, can solve the problems of borate hydrogel self-healing performance and stretching performance to be improved, and achieve the goal of preparation Simple method, evenly distributed effect

Active Publication Date: 2018-11-06
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on high-strength hydrogels based on simple borate bond crosslinking, and the self-healing and tensile properties of borate hydrogels currently reported need to be improved.

Method used

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  • Stretchable self-repairing hydrogel based on dynamic covalent crosslinking agent and preparation method thereof
  • Stretchable self-repairing hydrogel based on dynamic covalent crosslinking agent and preparation method thereof
  • Stretchable self-repairing hydrogel based on dynamic covalent crosslinking agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Embodiment 1 Preparation of dynamic covalent crosslinking agent containing borate bond

[0042] (1) Preparation of AOI-2OH

[0043] The whole preparation reaction of AOI-2OH is at room temperature N 2 atmosphere, the specific steps are as follows:

[0044] First, 1.37 g of 2-aminopropanediol (15 mmol) was dissolved in 3 mL of methanol, N 2 Stir in the atmosphere for 20 min, and add 2.11 g of AOI (15 mmol) after the solution is clear. After 16 hours, the reaction was terminated, the solvent was removed by filtration at room temperature, and the filtrate was dissolved and washed repeatedly with ethyl acetate for 4 to 5 times. Finally, the obtained white solid product was dried in a vacuum oven at 40°C for 12 hours to obtain a monomer containing a dihydroxyl group at the end, hereinafter referred to as AOI-2OH, and its synthesis route is as follows:

[0045]

[0046] (2) Preparation of dynamic covalent crosslinker (DCL)

[0047] Add the monomer AOI-2OH synthesized ...

Embodiment 2

[0054] Embodiment 2 Preparation of self-healing hydrogel based on borate bond

[0055] The DCL cross-linking agent prepared in Example 1 and acrylamide (hereinafter referred to as Am) are dissolved in water, and the molar ratio of the two is 1:4.5 to obtain an aqueous solution, and photoinitiator Irgacure 2959 is added thereto, the mass of acrylamide in the aqueous solution Fraction is 15%, photoinitiator dosage is 1.5% of Am mass fraction. After ultrasonically mixing the above substances, inject them into a disposable plastic syringe or a special mold, and polymerize under ultraviolet light for 6 hours to obtain a colorless and transparent hydrogel.

Embodiment 3

[0057] The hydrogel was prepared according to the method of Example 2, except that the molar ratio of DCL to Am was 1:5.

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Abstract

The invention relates to a preparation method of a dynamic covalent crosslinking agent. The preparation method comprises following steps: dissolving a first micro molecule and a second micro moleculeinto an organic solvent, wherein one end of the first micro molecule is an o-dihydroxyl group, the other end is an amino group; one end of the second micro molecule is isocyanate / acyl chloride, and the other end is a polymerizable carbon-carbon double bond; carrying out reactions at a temperature of 20-30 DEG C in a protective atmosphere to make the amino group and isocyanate / acyl chloride carry out reactions to obtain a polymerizable monomer, whose tail end contains a dihydroxyl group; and reacting the monomer containing a tail end dihydroxyl group with a water solution containing tetrahydroxyl borate radicals at a temperature of 20-30 DEG C. The invention also provides a self-repairing hydrogel preparation method based on the dynamic covalent crosslinking agent mentioned above. The dynamic covalent crosslinking agent containing borate bonds and water soluble vinyl monomers are dissolved in water, and the obtained water solution carries out free radical polymerization to obtain the hydrogel. The prepared hydrogel has an excellent stretching performance and a rapid self-repairing performance.

Description

technical field [0001] The invention relates to the field of polymer polymerization, in particular to a stretchable self-healing hydrogel based on a dynamic covalent crosslinking agent and a preparation method thereof. Background technique [0002] Dynamic chemistry mainly refers to a special kind of chemistry that undergoes reversible bond breaking and recombination under the control of equilibrium conditions under specific conditions, and finally forms thermodynamically stable products. This kind of chemical bond can be divided into two types, one is non-covalent bond interaction, and the other is reversible covalent bond, also known as dynamic covalent bond. Dynamic covalent bonds can be opened under certain environmental conditions (such as temperature, pH value, light or chemical stimulation) and establish a thermodynamic equilibrium reaction between reactants and product molecules. The components of product molecules can be exchanged and recombined to form new covalen...

Claims

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Application Information

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IPC IPC(8): C07F5/02C08F220/56C08F220/06C08F226/10C08F230/06C08F220/58
CPCC07F5/022C08F220/06C08F220/56C08F220/58C08F220/585C08F226/10C08F230/06
Inventor 郭明雨王丽媛
Owner SUZHOU UNIV
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