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High-toughness self-repairing physical hydrogel based on dual ion coordination and preparation method thereof

A self-healing, physical water technology, applied in the field of high-strength and tough self-healing physical hydrogel and its preparation, can solve the problems of poor mechanical properties of hydrogels, limited application scope of chitosan-based hydrogels, etc., and achieve excellent mechanical properties. performance, excellent self-healing performance, the effect of broadening the application range

Active Publication Date: 2018-12-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the amino groups and hydroxyl groups on chitosan have multiple coordination effects with metal ions, which can form physically cross-linked hydrogels; however, the mechanical properties of the hydrogels are poor, which greatly limits the ability of chitosan-based water The scope of application of the gel

Method used

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  • High-toughness self-repairing physical hydrogel based on dual ion coordination and preparation method thereof
  • High-toughness self-repairing physical hydrogel based on dual ion coordination and preparation method thereof
  • High-toughness self-repairing physical hydrogel based on dual ion coordination and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Weigh 4g of chitosan with a viscosity-average molecular weight of 10w and a deacetylation degree of 85%, and disperse it in 200mL of deionized water, add 5.84mL (85.2mmol) of acrylic acid, stir and dissolve, and react at 50°C for 3 days. After the reaction, the pH of the product was adjusted to 10-12 with sodium hydroxide solution, then dialyzed for 3 days with a dialysis bag, and freeze-dried to obtain N-carboxyethyl chitosan (CEC);

[0023] 2) Dissolve 0.05 g of the CEC prepared in step 1) in 4 mL of deionized water, and stir evenly to obtain a uniform and transparent solution A. Then add 1g of acrylic acid (AA), 50μL of 1.39mol / L FeCl 3 Aqueous solution (0.5mol% AA), 10μL of 1.39mol / L CaCl 2 Solution (0.1mol% AA), mixed uniformly to obtain solution B;

[0024] 3) Perform high vacuum deoxygenation on solution B, add 20 μL ammonium persulfate (APS) aqueous solution (0.1 g / mL) and 7 μL catalyst N,N,N',N'-tetramethyldiethylamine in sequence under nitrogen atmosphere...

Embodiment 2

[0028] 1) Weigh 4g of chitosan with a viscosity-average molecular weight of 10w and a deacetylation degree of 85%, and disperse it in 200mL of deionized water, add 5.84mL (85.2mmol) of acrylic acid, stir and dissolve, and react at 50°C for 3 days. After the reaction, the pH of the product was adjusted to 10-12 with sodium hydroxide solution, then dialyzed for 3 days with a dialysis bag, and freeze-dried to obtain N-carboxyethyl chitosan (CEC);

[0029] 2) Dissolve 0.1 g of CEC prepared in step 1) in 4 mL of deionized water, and stir evenly to obtain a uniform and transparent solution A. Then add 1g of acrylic acid (AA), 50μL of 1.39mol / L FeCl 3 Aqueous solution (0.5mol% AA), 10μL of 1.39mol / L CaCl 2 Solution (0.1mol% AA), mixed uniformly to obtain solution B;

[0030] 3) Perform high vacuum deoxygenation on solution B, add 20 μL ammonium persulfate (APS) aqueous solution (0.1 g / mL) and 7 μL catalyst N,N,N',N'-tetramethyldiethylamine in sequence under nitrogen atmosphere (TE...

Embodiment 3

[0034] 1) Weigh 4g of chitosan with a viscosity-average molecular weight of 100w and a deacetylation degree of 50% and disperse it in 200mL of deionized water, add 5.84mL (85.2mmol) of acrylic acid and stir to dissolve, and react at 50°C for 3 days. After the reaction, the pH of the product was adjusted to 10-12 with sodium hydroxide solution, then dialyzed for 3 days with a dialysis bag, and freeze-dried to obtain N-carboxyethyl chitosan (CEC);

[0035] 2) Dissolve 0.03 g of CEC prepared in step 1) in 4 mL of deionized water, and stir evenly to obtain a uniform and transparent solution A. Then add 1g of acrylic acid (AA), 50μL of 1.39mol / L FeCl 3 Aqueous solution (0.5mol% AA), 10μL of 1.39mol / L CaCl 2 Solution (0.1mol% AA), mixed uniformly to obtain solution B;

[0036] 3) Perform high vacuum deoxygenation on solution B, add 20 μL ammonium persulfate (APS) aqueous solution (0.1 g / mL) and 7 μL catalyst N,N,N',N'-tetramethyldiethylamine in sequence under nitrogen atmosphere ...

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Abstract

The invention discloses high-toughness self-repairing physical hydrogel based on dual ion coordination and a preparation method thereof. The physical hydrogel has multi-crosslinking sites. The preparation method of the high-toughness self-repairing physical hydrogel comprises the following steps: dissolving N-carboxyethyl chitosan (CEC), acrylic acid (AA), an FeCl3 water solution and a CaCl2 watersolution into de-ionized water according to a certain ratio and carrying out ultrasonic treatment to obtain a uniform and transparent solution; then carrying out vacuum deoxygenation on the solution;adding an ammonium persulfate (APS) water solution and a catalyst N,N,N',N'-tetramethyldiethylamine (TEMED) in sequence under the protection of nitrogen gas; reacting for at least 4h under the condition of 30 to 50 DEG C, so as to prepare the physical hydrogel. The physical hydrogel provided by the invention has excellent mechanical properties and self-repairing properties; metal ions are introduced so that the gel has certain ionic conductivity; furthermore, an application range of the chitosan based self-repairing hydrogel is expanded; the high-toughness self-repairing physical hydrogel ishopefully applied to fields including wearable flexible electronic devices, soft-bodied robots, biomedicines, aerospace and the like.

Description

technical field [0001] The invention relates to a high-strength self-repairing physical hydrogel based on double ion coordination and a preparation method thereof, belonging to the technical field of material preparation. Background technique [0002] In recent years, as a very important soft material, self-healing hydrogel has great potential application value in the fields of electronic skin, wearable flexible devices, and biomedicine. The currently reported self-healing hydrogel materials have problems such as low mechanical strength, single performance, and poor self-healing performance, which greatly limit their application range. Therefore, the development of multifunctional high-strength self-healing hydrogel materials has important scientific significance and application value. [0003] As the only natural weakly alkaline polysaccharide in nature, chitosan contains a large amount of amino groups and hydroxyl groups, and its raw materials are abundant and easy to obt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L5/08C08L33/02C08K3/16C08B37/08
CPCC08B37/003C08J3/075C08J2305/08C08J2433/02C08K3/16C08K2003/162
Inventor 王征科傅倍佳程宝校金晓强鲍晓炯乔丰慧周一姜质琦胡巧玲
Owner ZHEJIANG UNIV
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