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Chitosan/zwitter-ion and acrylic acid copolymer double network self-healing hydrogel and preparation method thereof

A zwitterion and chitosan technology, applied in the field of hydrogel, can solve the problems of waste of raw materials, lack of self-healing performance, complicated preparation process, etc., and achieve a simple preparation method, excellent self-healing ability, and high sensitivity Effect

Active Publication Date: 2019-10-25
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the poor mechanical properties of current hydrogels compared with conventional flexible elastic substrates, while the preparation process of traditional double-network hydrogels is complicated, raw materials are relatively wasteful, and they do not have self-healing properties. A chitosan / zwitterion and acrylic acid copolymer double network self-healing hydrogel and its preparation method are proposed

Method used

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  • Chitosan/zwitter-ion and acrylic acid copolymer double network self-healing hydrogel and preparation method thereof
  • Chitosan/zwitter-ion and acrylic acid copolymer double network self-healing hydrogel and preparation method thereof
  • Chitosan/zwitter-ion and acrylic acid copolymer double network self-healing hydrogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-8

[0045] A preparation method of chitosan / zwitterion and acrylic acid copolymer double network self-healing hydrogel, comprising the following preparation steps:

[0046] 1) placing chitosan (molecular weight less than 10000Da), zwitterionic monomer, acrylic acid monomer and initiator α-ketoglutaric acid in deionized water to obtain a mixed solution;

[0047] 2) Deoxygenate the mixed solution, and ultrasonically remove the air bubbles in the mixed solution to obtain a prepolymerized solution;

[0048] 3) Seal the pre-polymerization solution in a light-transmitting mold, irradiate it with ultraviolet light, and obtain a pre-gel after the reaction is completed;

[0049] 4) soaking the pregel in the multivalent anion solution to obtain the chitosan / zwitterion and acrylic acid copolymer double network self-healing hydrogel.

[0050] Wherein, the degree of deacetylation of chitosan described in Examples 1-6 is 90%, the amphoteric ion monomer is sulfobetaine methyl methacrylate, feed...

Embodiment 2

[0064] The stress-strain curve of the hydrogel prepared in Example 2 and its self-healing at room temperature for 24 hours is as follows: figure 1 As shown, the initial tensile strength and the tensile strength after 24 hours of self-healing correspond to the A and B curves in the figure respectively. Comparing the A curve, it can be known that when the content of sulfobetaine methyl methacrylate is greater than 0.7g / mL, with the When the content of acid betaine methyl methacrylate increases, the tensile strength of the double network hydrogel increases. When the SBMA content is 1.12g / mL, the tensile strength can reach up to 0.11MPa. Comparing curves A and B, it can be seen that When the SBMA content was 0.84g / mL, the self-healing performance of the hydrogel was the best, and the tensile strength could recover to 62% of the initial state after 24 hours of self-healing at room temperature.

Embodiment 3

[0065] The performance recovery rate of the double-network hydrogel prepared in Example 3 at room temperature for different times of self-healing is as follows: figure 2 As shown in the figure, the longer the time, the better the self-healing effect, and the performance recovery rate after 24 hours is 62%.

[0066] The stress-strain curves of the double network hydrogels with different acrylic acid contents prepared in Examples 3 and 4 after self-healing at room temperature for 24 hours are as follows: image 3 As shown, the initial tensile strength and the tensile strength after 24 hours of self-healing correspond to curves A and B in the figure respectively. Comparing curve A, it can be seen that when the acrylic acid content increases from 0mol% to 15mol%, the initial tensile strength of the double network hydrogel The strength increases. When the acrylic acid content is 15%, its initial tensile strength is 0.11MPa. When the acrylic acid content continues to increase to 20...

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Abstract

The invention discloses chitosan / zwitter-ion and acrylic acid copolymer double network self-healing hydrogel and a preparation method thereof, and relates to the technical field of hydrogel. The hydrogel is of a double network structure, and formed by a first network and a second network in a mutually penetrating mode, the first network is a physical cross-linking network formed by chitosan and polyvalent negative ions, the second network is a copolymer network formed by a zwitter-ion monomer and an acrylic acid monomer, the first network intersperses in the second network, the chitosan and the polyvalent negative ions are selected to form the first network, the zwitter-ion monomer and the acrylic acid monomer are selected to form the second network, the double network self-healing hydrogel, obtained by the cross-linking purely physical effect, with the mutually interspersed first network and the second network makes the hydrogel have excellent mechanical performance and self-healing ability, the high relative resistance change rate is provided when deformation occurs, and the chitosan / zwitter-ion and acrylic acid copolymer double network self-healing hydrogel has broad applicationprospects in the field of soft electronics, especially as biomedical sensors.

Description

technical field [0001] The invention relates to the field of hydrogel technology, in particular to a double network self-healing hydrogel of chitosan / zwitterion and acrylic acid copolymer and a preparation method thereof. Background technique [0002] Stretchable, wearable, flexible, and human-friendly strain sensors that convert mechanical deformation into electrical signals have attracted extensive attention in the fields of artificial intelligence, soft robotics, and health monitoring. At present, some electronic strain sensors have been prepared by dispersing conductive materials (conductive polymers, carbon-based nanoparticles, metal nanowires, etc.) in flexible elastomeric substrates (PDMS, natural rubber, etc.) (Hou W, Sheng N, Zhang X, et al.Design of injectable agar / NaCl / polyacrylamide ionic hydrogels for high performance strain sensors[J].Carbohydrate polymers,2019,211:322-328.). These conductors meet the basic requirements of elasticity, sensitivity, and stretcha...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L33/02C08L5/08C08F220/06C08F220/38C08F2/48
CPCC08J3/075C08J3/246C08F220/06C08F2/48C08J2333/02C08J2405/08
Inventor 张静冯杰陈凌东
Owner ZHEJIANG UNIV OF TECH
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