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A self-healing multiple light-responsive bilayer supramolecular hydrogel, its preparation method and application

A supramolecular hydrogel and self-healing technology, applied in the field of supramolecular chemistry, can solve problems such as application limitations of reversible deformation functions, failure to meet social needs, and lack of self-healing ability, etc., to achieve low production costs and prolong service life , No secondary pollution effect

Active Publication Date: 2022-07-26
QUZHOU RES INST OF ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogel needs to use saline solution as a medium to achieve deformation, and the concentration of saline solution needs to be controlled, which increases the complexity of operation
Moreover, the single reversible deformation function of the hydrogel also greatly limits its application.
[0006] Most of the photoresponsive hydrogel systems in current research are single photoresponse, and there are few studies on reversible discoloration and anisotropic reversible deformation. Most of the systems do not have self-healing ability, which is far from meeting the needs of society.

Method used

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  • A self-healing multiple light-responsive bilayer supramolecular hydrogel, its preparation method and application
  • A self-healing multiple light-responsive bilayer supramolecular hydrogel, its preparation method and application
  • A self-healing multiple light-responsive bilayer supramolecular hydrogel, its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0044] (1) Weigh N-isopropylacrylamide (720mg, 6.36mmol) and a certain amount of cyclodextrin monomer into 6ml of ultrapure water, stir and mix evenly, move to 0-5°C ice-water bath condition, add Graphene oxide aqueous dispersion, vented with argon (Ar 2 ) bubbling for 30min; weigh a certain amount of potassium persulfate (KPS), dissolve it in 400μl ultrapure water, add it to the reaction solution, and then add 30μl N,N,N',N'-tetramethylethylenediamine (TEMED) , to obtain the hydrogel layer 1 prepolymer solution. The hydrogel layer 1 was prepared by injecting it into a mold (60 mm×60 mm×1 mm) quickly with a syringe. The cross-linked structure of the hydrogel layer 1 is as follows figure 1 shown;

[0045] (2) Weigh N-isopropylacrylamide (720mg, 6.36mmol), a certain amount of cyclodextrin monomer, add acryloyloxyethyltrimethylammonium chloride to 6ml of ultrapure water, stir and mix well, Move to 0 ~ 5 ℃ ice-water bath condition, ventilate argon (Ar 2 ) bubbling for 30min; ...

Embodiment 4～6

[0050] According to the preparation process and raw material ratio of Examples 1, 2, and 3, only replacing α-cyclodextrin with β-cyclodextrin, the bilayer supramolecular hydrogels of Examples 4, 5, and 6 were obtained.

[0051] Performance Testing

[0052] The mechanical properties of the hydrogels obtained in Examples 1-3 were tested by optimizing the content of cyclodextrin through mechanical properties. The result is as image 3 As shown, in order to avoid the sample sliding on the bench, the hydrogel sample shape of the compression test is a cylinder. It was found that with the increase of cyclodextrin content, the crosslinking density of the hydrogel gradually increased, the entanglement between polymer chains was more, and the polymer network was tighter and denser. In the hydrogel of Example 3, cyclodextrin will affect the uniform dispersion of GO in the polymer network, causing the hydrogel to break when compressed, and its mechanical properties will decrease. Theref...

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Abstract

The invention relates to the technical field of supramolecular chemistry, and discloses a preparation method of a self-repairing multiple light-responsive bilayer supramolecular hydrogel. (1) N-isopropylacrylamide, cyclodextrin monomer, graphite oxide The hydrogel layer 1 is obtained by reacting the alkene water dispersion; (2) the pre-treatment of the hydrogel layer 2 is obtained by reacting N-isopropylacrylamide, cyclodextrin monomer, and acryloyloxyethyltrimethyl ammonium chloride. (3) injecting the prepolymerized liquid into a mold to obtain a double-layered hydrogel, and immersing it in an ammonium molybdate tetrahydrate solution to finally obtain the double-layered supramolecular hydrogel. The hydrogel utilizes the host-guest interaction between cyclodextrin and N-isopropylacrylamidoisopropyl to achieve physical cross-linking, and also realizes the tight connection between the bilayer hydrogels through the host-guest interaction. It has high bonding strength, good self-healing performance, multiple light-responsive deformation and color changing performance, and injectable performance.

Description

technical field [0001] The invention belongs to the technical field of supramolecular chemistry, and in particular relates to a self-healing multiple light-responsive bilayer supramolecular hydrogel, a preparation method and application thereof. Background technique [0002] Hydrogel refers to a class of macromolecules formed by physical or chemical cross-linking. It is a soft substance that can absorb a large amount of water and maintain its three-dimensional structure. As an important branch in the field of hydrogels, stimuli-responsive hydrogels can respond sensitively to external stimuli (such as temperature, pH, electric field, magnetic field, etc.). ), reversible changes in shape (shape memory) and color, etc., are widely used as smart responsive materials. As a kind of stimulation method that can easily adjust the intensity, wavelength and non-contact, light can realize remote and non-contact control. The research on photochromic behavior is also in the mature stage,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J7/14G06K19/06C08F251/00C08F220/54C08F220/34C08L51/02
CPCC08J3/075C08J7/14G06K19/06037G06K19/0614C08F251/00C08J2351/02C08J2451/02C08F220/54C08F220/34
Inventor 单国荣高巧峰潘鹏举
Owner QUZHOU RES INST OF ZHEJIANG UNIV
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