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Preparation method and application of green flexible conductive anti-freezing hydrogel

A flexible conductive and hydrogel technology, applied in the field of polymer materials and flexible electronics, can solve the problems of non-degradable composite hydrogel, weakening the advantages of hydrogel, environmental impact, etc., and achieve good self-healing performance and rich performance. , The effect of improving the anti-freezing and water-retaining effect

Inactive Publication Date: 2021-03-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional hydrogels have poor mechanical properties and are non-conductive. Some inorganic materials need to be added to enhance their mechanical properties and electrical conductivity. However, this composite hydrogel is often non-degradable, which weakens the "green" advantage of the hydrogel and will negative impact on the environment

Method used

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  • Preparation method and application of green flexible conductive anti-freezing hydrogel
  • Preparation method and application of green flexible conductive anti-freezing hydrogel

Examples

Experimental program
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Embodiment 1

[0031] The preparation method of the green flexible conductive antifreeze hydrogel of the present embodiment comprises the following steps:

[0032] (1) 10g of PVA and 0.51g of LS were mixed in DMSO / water co-solvent, wherein both DMSO and water were 50mL, stirred at 100-135°C for 2.5-5h at a speed of 200-350rpm to obtain solution A;

[0033] (2), 10gPVA and 0.032gFeCl 3 Dissolve in 100mLPA aqueous solution, and stir the mixture at 75-90°C for 2.5-5h to obtain solution B;

[0034] (3) Mix solution A and solution B evenly, cool to 40-60°C, pour into a mold, and place at -10°C for 10-20h to form a hydrogel. The resulting hydrogel is then placed in water for 2-5 days to displace DMSO from the hydrogel;

[0035] (4) Add 0.47g of aniline into the ethanol / water solution, including 20mL of ethanol and 80mL of water, and disperse evenly under the action of ultrasound. 1.25g of ammonium persulfate (APS) was dissolved in deionized water, and added to the aniline solution and mixed eve...

Embodiment 2

[0041] The preparation method of the green flexible conductive antifreeze hydrogel of the present embodiment comprises the following steps:

[0042] (1) 10g of PVA and 0.99g of LS were mixed in DMSO / water co-solvent, wherein DMSO was 70mL, water was 30mL, and stirred at 100-135°C for 2.5-5h at a speed of 200-350rpm to obtain solution A;

[0043] (2), 30gPVA and 0.486gFeCl 3 Dissolve in 100mLPA aqueous solution, and stir the mixture at 75-90°C for 2.5-5h to obtain solution B;

[0044] (3) Mix solution A and solution B evenly, cool to 40-60°C, pour into a mold, and place at 10°C for 10-20h to form a hydrogel. The resulting hydrogel is then placed in water for 2-5 days to displace DMSO from the hydrogel;

[0045] (4) Add 0.47g of aniline into the ethanol / water solution, including 50mL of ethanol and 50mL of water, and disperse evenly under the action of ultrasound. 2.05g of ammonium persulfate (APS) was dissolved in deionized water, and added to the aniline solution and mixed ...

Embodiment 3

[0049] The preparation method of the green flexible conductive antifreeze hydrogel of the present embodiment comprises the following steps:

[0050](1) Mix 10 g of PVA and 0.6 g of LS in DMSO / water co-solvent, wherein both DMSO and water are 50 mL, and stir at 100-135 ° C for 2.5-5 h at a speed of 200-350 rpm to obtain solution A;

[0051] (2), 10gPVA and 0.1gFeCl 3 Dissolve in 100mLPA aqueous solution, and stir the mixture at 75-90°C for 2.5-5h to obtain solution B;

[0052] (3) Mix solution A and solution B evenly, cool to 40-60°C, pour into a mold, and place at 5°C for 10-20h to form a hydrogel. The resulting hydrogel is then placed in water for 2-5 days to displace DMSO from the hydrogel;

[0053] (4) Add 0.47g of aniline into the ethanol / water solution, including 35mL of ethanol and 65mL of water, and disperse evenly under the action of ultrasound. Dissolve 2g of ammonium persulfate (APS) in deionized water, and add it to the aniline solution and mix well;

[0054] (5...

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Abstract

The invention provides a preparation method and application of green flexible conductive anti-freezing hydrogel. The green flexible conductive anti-freezing hydrogel disclosed by the invention can beused for monitoring human movement at normal temperature and low temperature. According to the invention, polyvinyl alcohol (PVA), phytic acid (PA), sodium lignin sulfonate (LS), polyacrylamide (PANI), FeCl3 and glycerol are used as materials, PA, LS and PANI are added into PVA hydrogel, the defects that pure PVA hydrogel is poor in mechanical property and non-conductive can be greatly overcome, PANI can also endow the hydrogel with the thermosensitive characteristic, and introduction of FeCl3 and glycerol can improve the conductivity, water retention and frost resistance characteristics of the composite hydrogel. Meanwhile, hydrogen bonds formed by interaction of PA, LS, PVA and glycerin also enable the composite hydrogel to have self-healing performance; the preparation method of the green flexible conductive anti-freezing hydrogel is simple and convenient to operate, the material source is green, and the prepared composite hydrogel can be repeatedly used.

Description

technical field [0001] The invention belongs to the technical field of polymer materials and flexible electronics, and in particular relates to a preparation method and application of a green flexible conductive antifreeze hydrogel. Background technique [0002] Hydrogel is a material with a high water content that can form a 3D network structure through physical or chemical cross-linking. It has good biocompatibility and is used in biomedical, tissue engineering, wearable electronic devices, flexible Sensors and other aspects are widely used. However, traditional hydrogels have poor mechanical properties and are non-conductive. Some inorganic materials need to be added to enhance their mechanical properties and electrical conductivity. However, this composite hydrogel is often non-degradable, which weakens the "green" advantage of the hydrogel and will have a negative impact on the environment. Contents of the invention [0003] In view of the deficiencies in the prior ...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08L29/04C08L97/00C08L79/02C08K13/02C08K5/521C08K5/053C08K3/16
CPCC08J3/075C08J2329/04C08J2479/02C08J2497/00C08K3/16C08K5/053C08K5/521C08K13/02C08K2201/001
Inventor 袁伟忠周子璇
Owner TONGJI UNIV
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