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Chitosan/ poly-sulfonic acid group betaine dual network self-healing hydrogel and preparation method thereof

A technology of polysulfonic acid group and sulfonic acid beet, which is applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problems of high self-healing performance and inability to obtain mechanical properties at the same time, and achieve the effect of mechanical property recovery

Active Publication Date: 2019-10-25
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] The present invention proposes a chitosan / polysulfonate betaine double network self-healing system to overcome the problems that the good self-healing properties and high mechanical properties of the current physically cross-linked hydrogel cannot be obtained at the same time. Hydrogel and its preparation method

Method used

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  • Chitosan/ poly-sulfonic acid group betaine dual network self-healing hydrogel and preparation method thereof
  • Chitosan/ poly-sulfonic acid group betaine dual network self-healing hydrogel and preparation method thereof
  • Chitosan/ poly-sulfonic acid group betaine dual network self-healing hydrogel and preparation method thereof

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Embodiment 1-7

[0039] A preparation method of chitosan / polysulfobetaine double network self-healing hydrogel, comprising the following preparation steps:

[0040] 1) Prepare chitosan (molecular weight less than 10000Da), sulfobetaine methyl methacrylate, cetyltrimethylammonium chloride, octadecyl methacrylate and initiator α-ketoglutaric acid mixed solution;

[0041] 2) Deoxygenate the mixed solution, and ultrasonically remove the air bubbles in the mixed solution to obtain a prepolymerized solution;

[0042] 3) Inject the pre-polymerization liquid into the light-transmitting mold, irradiate the reaction with ultraviolet light, and obtain the pre-gel after the reaction is completed;

[0043] 4) soaking the pregel in the multivalent anion solution to obtain the chitosan / polysulfobetaine double network self-healing hydrogel.

[0044] Wherein, the deacetylation degree of chitosan described in embodiment 1-5 is 95%, feeds nitrogen gas during deoxygenation, and multivalent anion solution is sat...

Embodiment 2

[0060] The strain-resistance change rate curve of the double network hydrogel prepared in Example 2 is as follows Figure 6 As shown in the figure, it can be known that the resistance change rate of the double network hydrogel is greater than 80% under 50% strain, and the resistance change rate reaches 30% under 25% strain.

[0061] The resistance change rate curves of the double-network hydrogel prepared in Example 2 under different bending angles of the simulated joints are shown in Figure 7. It can be seen from the figure that as the joint bending angle increases, the resistance change rate increases significantly , when the bending angle is 90°, the resistance change rate is about 40%, and when the bending angle is 135°, the resistance change rate is greater than 50%.

[0062] The self-healing effects of the double network hydrogels prepared in Example 2 and Comparative Example are shown in Table 4.

[0063] self-healing effect Example 2 excellent ...

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Abstract

The invention discloses a chitosan / poly-sulfonic acid group betaine dual network self-healing hydrogel and preparation method thereof, and relates to the field of hydrogels. The hydrogel is of a duelnetwork structure which is formed by mutually penetrating of a first network and a second network, the first network is a physical crosslinking network formed by the coordination action of the chitosan and polyvalent anions, the second network is a poly-sulfonic acid group betaine physical crosslinking network, and the first network intersperses in the second network. According to the chitosan / poly-sulfonic acid group betaine dual network self-healing hydrogel, the first network is formed by selecting the chitosan and the polyvalent anions, the second network is formed by selecting the poly-sulfonic acid group betaine, a micelle is adopted as a physical crosslinking point of the poly-sulfonic acid group betaine second network to be crosslinked with the second network, thus the first network and the second network intersperse each other, the duel network structure of the hydrogel is achieved, thus the hydrogel has excellent mechanical properties and self-healing ability, the resistance change rate under strain is large, the sensitivity is high, the test range of a strain sensor is wider, and wide application prospects are achieved.

Description

technical field [0001] The invention relates to the field of hydrogels, in particular to a chitosan / polysulfobetaine double network self-healing hydrogel and a preparation method thereof. Background technique [0002] In the past few years, a large number of advanced smart electronic devices have been developed, such as electronic skin, nanorobots, actuator elements based on flexible materials, and stretchable sensors. In practical applications, electronic devices are required to withstand mechanical deformations such as bending, folding, twisting, and stretching, which put forward higher requirements for the stability and durability of materials. A strain sensor is a type of sensor that can convert the mechanical deformation of an object into an output signal based on changes in resistance and capacitance. Resistance strain gauges are the most common sensing elements, which can convert mechanical deformation into resistance changes. These sensors can conform to complex sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08F220/38C08F220/18C08F2/48C08L33/14C08L5/08G01B7/16
CPCC08J3/075C08F220/38C08F2/48G01B7/18C08J2333/14C08J2405/08C08F220/387
Inventor 张静冯杰沈彪
Owner ZHEJIANG UNIV OF TECH
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