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A kind of low swelling "janus" conductive hydrogel and its preparation method and application

A conductive hydrogel and hydrogel technology, applied in the field of materials, can solve problems such as secondary trauma of biological tissues, and achieve the effects of low swelling rate, easy large-scale production, and wide application prospects.

Active Publication Date: 2022-03-25
QINGDAO UNIV
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  • Abstract
  • Description
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Problems solved by technology

Recently, LiuWenguang et al. reported a double-faced hydrogel adhesive for internal tissue repair, which has strong adhesion to wet biological tissue on the one hand and no adhesiveness on the other; Adhesives have significant advantages over traditional sutures and traditional double-sided bioadhesives: on the one hand, traditional sutures can easily cause secondary trauma to biological tissues; pain; traditional bioadhesives not only have an adhesive effect on the wound, but also have an adhesive effect on the surrounding tissue. After use, it is easy to adhere to the external surrounding tissue. Postoperative inflammation, intestinal obstruction and other serious adverse consequences caused by postoperative adhesion , often requires secondary surgery, but Janus Hydrogel does not have the above problems
[0004] Janus hydrogels are very important in a variety of applications, but the research on Janus hydrogels is still in its preliminary stage, so far there are few reports on Janus hydrogels with conductive-dielectric properties

Method used

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  • A kind of low swelling "janus" conductive hydrogel and its preparation method and application
  • A kind of low swelling "janus" conductive hydrogel and its preparation method and application

Examples

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preparation example Construction

[0022] A preparation method of low swelling "Janus" conductive hydrogel, which comprises the following steps:

[0023] (1) Put polyvinyl alcohol and tannic acid in water, stir at a constant temperature of 90°C for 30-60 minutes to obtain a polyvinyl alcohol-tannic acid mixed solution, and cool to room temperature;

[0024] (2) Put sodium alginate in the same amount of water as in step (1), and stir at room temperature for 60-120 min to obtain an aqueous solution of sodium alginate.

[0025] (3) Add the polyvinyl alcohol-tannic acid mixed solution obtained in step (1) to the sodium alginate aqueous solution obtained in step (2), stir and mix evenly to obtain a polyvinyl alcohol-tannic acid-sodium alginate mixed solution solution;

[0026] (4) After centrifuging the mixed solution obtained in step (3), transfer it to a mold, and let it stand for stratification.

[0027] (5) Freeze the solution after standing and stratifying in the refrigerator, and then take it out and melt it...

Embodiment 1

[0043] Add a mixture of 1.5925g polyvinyl alcohol and 0.1800g tannic acid into 19.0000g deionized water, raise the temperature to 90°C, stir for 1h, then cool the mixture to room temperature to obtain a tannic acid-polyvinyl alcohol mixed solution. Add 0.2275g of sodium alginate to 19.0000g of deionized water at room temperature, stir for 2 hours until dissolved, and obtain a sodium alginate solution.

[0044]Add the tannic acid-polyvinyl alcohol mixed solution into the sodium alginate solution, and stir for 30 minutes to make it evenly mixed. The mixed solution was centrifuged and transferred to a mold, and left to stand at room temperature for 1 h. The solution after static stratification was frozen in the refrigerator for 8 hours, taken out and thawed for 2 hours, and the operation was repeated 3 times. Soak the upper layer of the obtained hydrogel in 1% calcium chloride solution for 60 minutes to obtain a low-swelling "Janus" conductive hydrogel.

Embodiment 2

[0046] Repeat Example 1, the difference is: the mass concentration of calcium chloride solution is 2%.

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Abstract

The invention belongs to the field of materials, and relates to a low-swelling "Janus" conductive hydrogel and its preparation method and application, which comprises the following steps: preparing a polyvinyl alcohol-tannic acid mixed solution; mixing polyvinyl alcohol-tannic acid Mix the solution with sodium alginate solution evenly to obtain a mixed solution of polyvinyl alcohol-tannic acid-sodium alginate; centrifuge the mixed solution of polyvinyl alcohol-tannic acid-sodium alginate, let it stand for stratification, and perform multiple freezing Melt cycle to obtain hydrogel; soak the upper layer of hydrogel in calcium chloride solution to obtain low swelling "Janus" conductive hydrogel. The "Janus" conductive hydrogel prepared by the present invention not only has excellent anti-swellability and mechanical properties, but also exhibits significantly different conductive properties on both sides (one side is strongly conductive, one side is weakly conductive), and it can be used in bioelectronics (such as artificial skin, Biosensors, intelligent robots, etc.) have a wide range of application prospects.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a preparation method of a low-swelling "Janus" conductive hydrogel. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Hydrogel is a swelling system formed after the hydrophilic three-dimensional polymer network absorbs water, and the water content in it is often ten times or even dozens of times that of the hydrophilic polymer. Hydrogels have squishy properties similar to biological tissues or organs, and have been widely used or shown good application prospects in many fields, especially biomedical fields, and have attracted extensive attention from researchers. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/075C08J7/12C08L29/04C08L97/00C08L5/04
CPCC08J3/075C08J7/12C08J2329/04C08J2497/00C08J2405/04
Inventor 邢雅成马晓梅战艺伟
Owner QINGDAO UNIV
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