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Anti-freezing self-repairing conductive hydrogel and preparation method thereof and flexible sensor

A technology of conductive hydrogel and composite hydrogel, which is applied in the direction of electromagnetic measuring devices, electric/magnetic solid deformation measurement, etc., can solve the problem that the freezing resistance of hydrogel cannot meet the needs of sensor materials, reduce mechanical properties and electrical conductivity, organic Solve problems such as poor mechanical properties of hydrogels, achieve excellent mechanical flexibility and electrical conductivity, low cost, and high sensitivity

Inactive Publication Date: 2021-04-06
南京柔速科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, patent CN107973920A discloses a cellulose / two-dimensional layered material composite hydrogel, but the freezing resistance of the hydrogel cannot meet the needs of sensor materials
In the prior art, the use of organic liquids such as propylene or ethylene glycol has been used to synthesize hybrid organic hydrogels with improved temperature range, however, the introduction of these organic solvents affects the formation of hydrogen bonds in the hydrogels, reducing the mechanical properties. and electrical conductivity, and does not have self-healing properties; there are also organic hydrogels with good frost resistance prepared by adding other antifreeze agents, but these organic hydrogels have poor mechanical properties, cumbersome preparation process and non-conductive

Method used

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  • Anti-freezing self-repairing conductive hydrogel and preparation method thereof and flexible sensor
  • Anti-freezing self-repairing conductive hydrogel and preparation method thereof and flexible sensor
  • Anti-freezing self-repairing conductive hydrogel and preparation method thereof and flexible sensor

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Experimental program
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Effect test

Embodiment 1

[0037] The present embodiment provides an MXene / nanocellulose / polyacrylamide antifreeze self-healing conductive hydrogel, the preparation method of which is as follows:

[0038] 1) MXene / nanocellulose / polyacrylamide hydrogel preparation:

[0039]Dissolve 5 mg of MXene in 10 ml of deionized water, and ultrasonically treat it with an ultrasonic cell disruptor for 30 min to obtain a uniform MXene dispersion; then add 0.156 g of nanocellulose, and stir at 50°C for more than 45 minutes until the nanocellulose is completely dissolved; in an ice bath environment, Add 1.56g acrylamide (stir for 30min), 106.5mg ammonium persulfate (stir 30min), 2.4mg N'N-methylenebisacrylamide (stir 10min) in turn, remove the ice bath, wait for the solution to return to room temperature, After pouring into a petri dish for repeated degassing, and reacting at 60 °C for 3 h, MXene / nanocellulose / polyacrylamide hydrogel was obtained;

[0040] 2) Organic modification of MXene / nanocellulose / polyacrylamide h...

Embodiment 2

[0043] This embodiment provides a flexible sensor, using the MXene / nanocellulose / polyacrylamide antifreeze self-healing conductive hydrogel prepared in the above embodiment 1 as the conductive sensing material, and the assembly method is as follows:

[0044] like figure 1 As shown, the MXene / nanocellulose / polyacrylamide antifreeze self-healing conductive hydrogel prepared in Example 1 was cut to a fixed size of 3 cm in length × 1 cm in width × 0.2 cm in height, as the substrate material 1 of the sensor. Cut two pieces of 3M double-sided tape with a length of 4 cm × width of 2 cm as the encapsulation layer 2, and place the MXene / nanocellulose / polyacrylamide organic hydrogel in the middle of the double-sided tape, respectively. Two copper tapes 3 are respectively connected to the two ends of the organic hydrogel as the positive and negative electrodes of the sensor. Finally, the two encapsulation layer components are assembled face-to-face to form a strain sensor, such as fig...

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Abstract

The invention relates to the technical field of flexible sensor materials, particularly to an anti-freezing self-repairing conductive hydrogel and a preparation method thereof, and a flexible sensor. According to the preparation method, a conductive nanofiller / nanocellulose / polyacrylamide hydrogel is soaked in a composite modifier aqueous solution containing an anti-freezing agent and a metal salt, wherein the metal salt cooperates with the anti-freezing agent component to replace water molecules in a hydrogel network system, so that the freezing point of water in a composite hydrogel network structure is reduced, and the freezing resistance is improved; metal cations and cellulose in the composite hydrogel form reversible ionic bonds, the cellulose and polyacrylamide form reversible hydrogen-bond interaction, and the prepared hydrogel is endowed with excellent self-repairing performance through a formed multiple reversible network; and the metal salt cooperates with the conductive nano-filler to endow the prepared hydrogel with excellent conductivity, sensitive sensing performance and mechanical flexibility meeting the requirements of corresponding application scenarios.

Description

technical field [0001] The invention relates to the technical field of flexible sensor materials, in particular to an antifreeze self-healing conductive hydrogel, a preparation method thereof, and a flexible sensor. Background technique [0002] With the development of the times, electronic devices have been used in all aspects of people's work and life. Flexible strain sensor is an electronic device with superior environmental adaptability made of flexible materials. It has been used in the fields of human health monitoring, human motion monitoring, human-computer interaction and soft robotics. [0003] Hydrogels, as hydrophilic polymer materials with three-dimensional cross-linked networks, have great application potential in the field of flexible sensors due to their excellent properties. Traditional hydrogels are inevitably frozen at low temperatures, and their mechanical and electrical properties are severely limited, and it is very important for reliable hydrogel sens...

Claims

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Application Information

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IPC IPC(8): C08J7/12C08J3/075C08J3/24C08L33/26C08L1/02C08K3/14C08K3/28G01B7/16
CPCC08J7/12C08J3/075C08J3/246G01B7/18C08J2333/26C08J2401/02C08K2201/001C08K3/14C08K3/28C08K2201/011
Inventor 经鑫张志尚盈辉谢智晖米皓阳
Owner 南京柔速科技有限公司
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