Dual-network hydrogel with high-toughness, shape-memory and self-repairing characteristics and preparation method of dual-network hydrogel

A dual-network and hydrogel technology, applied in the field of double-network hydrogel and its preparation, can solve the problems of poor mechanical properties and limit the application range of chitosan-based hydrogel, and achieve improved mechanical properties and good mechanical properties and self-healing performance, widening the effect of the application range

Active Publication Date: 2018-11-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The single-network hydrogel based on imine bonds constructed by chitosan amino groups and gelling factors containing aldehyde groups has excellent self-healing ability; however, the hydrog

Method used

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  • Dual-network hydrogel with high-toughness, shape-memory and self-repairing characteristics and preparation method of dual-network hydrogel
  • Dual-network hydrogel with high-toughness, shape-memory and self-repairing characteristics and preparation method of dual-network hydrogel
  • Dual-network hydrogel with high-toughness, shape-memory and self-repairing characteristics and preparation method of dual-network hydrogel

Examples

Experimental program
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Effect test

Embodiment 1

[0024] 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 transferred to a dialysis bag for dialysis for 3 days, freeze-dried to obtain N-carboxyethyl chitosan (CEC);

[0025] 2) Dissolve 6.52g (1.63mmol) polyethylene glycol (PEG4000), 0.98g (6.52mmol) 4-formylbenzoic acid, 0.05g (0.407mmol) 4-(dimethylamino)pyridine (DMAP) in 200mL in anhydrous tetrahydrofuran. Under nitrogen atmosphere, 1.68g (8.15mmol) of N,N'-dicyclohexylcarbodiimide (DCC) was added, and reacted at 20°C for 18h. After the reaction, the white solid was filtered off to obtain a filtrate containing the product. The filtrate was precipitated with ether, and the filter cake obtained by filtration was dissolved in tetrahydro...

Embodiment 2

[0032] 1) Weigh 4g of chitosan with a viscosity-average molecular weight of 10w and a deacetylation degree of 95%, 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 transferred to a dialysis bag for dialysis for 3 days, freeze-dried to obtain N-carboxyethyl chitosan (CEC);

[0033] 2) Dissolve 6.52g (1.63mmol) polyethylene glycol (PEG4000), 0.98g (6.52mmol) 4-formylbenzoic acid, 0.05g (0.407mmol) 4-(dimethylamino)pyridine (DMAP) in 200mL in anhydrous tetrahydrofuran. Under nitrogen atmosphere, 1.68g (8.15mmol) of N,N'-dicyclohexylcarbodiimide (DCC) was added, and reacted at 20°C for 18h. After the reaction, the white solid was filtered off to obtain a filtrate containing the product. The filtrate was precipitated with ether, and the filter cake obtained by filtration was dissolved in tetrahydro...

Embodiment 3

[0039] 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 transferred to a dialysis bag for dialysis for 3 days, freeze-dried to obtain N-carboxyethyl chitosan (CEC);

[0040] 2) Dissolve 3.27g (1.63mmol) polyethylene glycol (PEG2000), 0.98g (6.52mmol) 4-formylbenzoic acid, 0.05g (0.407mmol) 4-(dimethylamino)pyridine (DMAP) in 200mL in anhydrous tetrahydrofuran. Under nitrogen atmosphere, 1.68g (8.15mmol) of N,N'-dicyclohexylcarbodiimide (DCC) was added, and reacted at 20°C for 18h. After the reaction, the white solid was filtered off to obtain a filtrate containing the product. The filtrate was precipitated with ether, and the filter cake obtained by filtration was dissolved in tetrahyd...

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Abstract

The invention discloses dual-network hydrogel with high-toughness, shape-memory and self-repairing characteristics and a preparation method of the dual-network hydrogel. The dual-network hydrogel is formed by alternate arrangement of dual networks, a first network is a dynamic imine linkage network formed by Schiff base reaction of chitosan and polyethylene glycol with aldehyde groups at two ends,and a second network is a polyacrylamide cross-linked network. The preparation method mainly includes: dissolving N-carboxyethyl chitosan, acrylamide, N,N'-methylene bisacrylamide into water according to a certain proportion, and adding modified polyethylene glycol and ammonium persulfate mixed solution; performing reaction at 30-50 DEG C to obtain the dual-network hydrogel. The dual-network hydrogel prepared according to the preparation method is excellent in mechanical performance and self-repairing performance and has a shape memory performance of pH and metal ion stimulation response, anapplication range of chitosan self-repairing hydrogel materials is further expanded, and the dual-network hydrogel is hopefully applied to fields of wearable flexible electronic devices, software robots, biomedicine, aerospace engineering and the like.

Description

technical field [0001] The invention relates to a double-network hydrogel, in particular to a double-network hydrogel with high strength, shape memory and self-repairing properties and a preparation method thereof. Background technique [0002] In recent years, self-healing hydrogel materials, as a very important soft material, have great potential application value in electronic skin, wearable flexible devices, biomedicine and other fields. 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...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08F291/12C08F220/56C08F222/38C08G65/332C08G65/333C08B37/08C08L51/00
CPCC08B37/003C08F283/06C08F289/00C08G65/3326C08G65/333C08G65/33317C08G2650/04C08J3/075C08J2351/00C08J2351/08C08J2451/00C08J2451/08C08F220/56C08F222/385
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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