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Preparation method of stretchable anti-freezing organic hydrogel thermistor material

A thermistor and hydrogel technology, applied in the fields of polymer materials and flexible electronics, can solve problems such as low negative temperature coefficient, and achieve the effects of high sensitivity, low production cost and good stability

Inactive Publication Date: 2021-12-17
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention solves the technical problem of low negative temperature coefficient of the ion-conductive hydrogel thermistor material in the prior art, and provides a preparation method of a stretchable antifreeze organic hydrogel thermistor material

Method used

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  • Preparation method of stretchable anti-freezing organic hydrogel thermistor material
  • Preparation method of stretchable anti-freezing organic hydrogel thermistor material
  • Preparation method of stretchable anti-freezing organic hydrogel thermistor material

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preparation example Construction

[0031] The invention provides a method for preparing a stretchable antifreeze organic hydrogel thermistor material. The method is to perform solvent exchange on the hydrogel through a solvent exchange method and then prepare the organic hydrogel thermistor material .

[0032] A specific embodiment of the preparation method of the stretchable antifreeze organic hydrogel thermistor material of the present invention is as follows: the method is to use the N-acryloyl glycinamide (NAGA) monomer having the structure of formula 1 After copolymerizing with acrylamide (AAm) monomer, the organic hydrogel thermistor material is prepared by solvent exchange.

[0033] The monomer N-acryloyl glycinamide (NAGA) used in the present invention is synthesized with reference to the synthesis method reported in the literature, and the N-acryloyl glycinamide (NAGA) monomer is obtained by the following reaction, and the structure is as shown in formula 1 :

[0034]

[0035] Wherein, the molecul...

Embodiment 1

[0049]In the round bottom flask, add 1.5g of NAGA monomer with formula 1 structure, 0.5g of AAm monomer, the mass ratio of NAGA to AAm monomer is 3:1, then add 8mL of deionized water, 20mg of photoinitiator I2959, and stir at room temperature until completely dissolved. The round-bottomed flask containing the solution was frozen and thawed in liquid nitrogen to deoxygenate, then poured into a glass mold, sealed and polymerized for 3 hours under the light of an ultraviolet lamp (365nm, 10W) ​​to form a hydrogel. The hydrogel was taken out from the mold, placed in glycerin with 10 times the weight of the hydrogel, and solvent exchanged at room temperature 25°C for 6 hours to obtain P(NAGA-co-AAm)-3:1 organic hydrogel thermosensitive resistive material.

Embodiment 2

[0051] The mass of NAGA monomer added is 1g, the mass of AAm monomer is 1g, the mass ratio of NAGA to AAm monomer is 1:1, and the remaining parameters are the same as in Example 1 to obtain P(NAGA-co-AAm)-1:1 Organic hydrogel thermistor materials.

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Abstract

The invention relates to a preparation method of a stretchable anti-freezing organic hydrogel thermistor material, and belongs to the field of high polymer materials and flexible electronics. The invention provides a preparation method of a stretchable anti-freezing organic hydrogel thermistor material. The preparation method is characterized in that the organic hydrogel thermistor material is prepared by carrying out solvent exchange on hydrogel through a solvent exchange method. The organic hydrogel thermistor material prepared by the invention overcomes the defects of low negative temperature coefficient (TCR is greater than -3% / DEG C) and easy freezing and flexibility loss at low temperature of common ionic conductive hydrogel. The composite material has the advantages of excellent comprehensive performance, high stretchability, good light transmittance, simple preparation process and low production cost; and the prepared flexible temperature sensor has the advantages of high sensitivity, good stability and the like. The stretchable anti-freezing organic hydrogel thermistor material prepared by the method can be applied to the field of temperature sensing.

Description

technical field [0001] The invention belongs to the field of polymer materials and flexible electronics, and in particular relates to a preparation method of a stretchable antifreeze organic hydrogel thermistor material. Background technique [0002] Hydrogel is a material with three-dimensional network and porous structure formed by chemical or physical cross-linking, which has transparency, high stretchability, multi-stimuli response and excellent biocompatibility. Hydrogels are made of water molecules that make the hydrogel an ion conductor and a polymer network that makes the hydrogel an elastic solid. By dissolving salt in water to generate freely mobile ions, the resistivity of water can be reduced, thereby improving the conductivity of hydrogels. Therefore, hydrogels have broad prospects in wearable electronic devices, medical monitoring and other fields. However, hydrogels are easy to dehydrate in atmospheric environment, and they are easy to freeze and lose flexibi...

Claims

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Application Information

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IPC IPC(8): C08F220/60C08F220/56C08F2/48
CPCC08F220/603C08F220/56C08F2/48
Inventor 杨小牛涂江山吕红英吴海洋杨磊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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