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Preparation method of conductive hydrogel based on nanocellulose-graphene-polyvinyl alcohol-polyethylenediamine

A technology of nanocellulose and conductive hydrogel, which can be used in the manufacture of conductive/antistatic filaments, cellulose/protein conjugated rayon, and conjugated synthetic polymer rayon, etc., which can solve the difficulty of production cost and synthesis increase the difficulty of large-scale industrial production of gels, etc., to achieve the effects of abundant reserves, improved cross-linking density and mechanical properties, and high crystallinity

Pending Publication Date: 2021-01-05
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The way to improve the performance of hydrogels through molecular design is like a "double-edged sword". On the one hand, the mechanical properties of the gel are significantly improved; Increased difficulty in large-scale industrial production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1): Dissolve 0.016 g TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) and 0.1 g NaBr in 100 mL deionized water, add 1 g bleached wood pulp fiber after completely dissolved , stir vigorously until the cellulose is dispersed evenly;

[0039] Step 2): Add 8 g NaClO to the solution in step 1) for oxidation reaction, and then continuously drop 0.5 mol / L NaOH solution to control the pH of the reaction system at about 10, and react for 6 h;

[0040] Step 3): Filter the oxidized cellulose, wash it with deionized water 4 times, and then perform ultrasonic dispersion to make a slurry, prepare a 2.0 mg / mL cellulose suspension, and place it in a sealed bottle with magnetic stirring for 8 days. After the stirring speed is 1500 rpm, put it in the refrigerator (below 4°C) and store it for later use;

[0041] Step 4): Take 100 mL of the cellulose suspension in step 3), add 0.07 g graphene and stir well, and use ultrasonic treatment to disperse the polymer evenly to obtain a s...

Embodiment 2

[0047] Step 1): Dissolve 0.016 g TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) and 0.1 g NaBr in 100 mL deionized water, add 1 g bleached wood pulp fiber after completely dissolved , stir vigorously until the cellulose is dispersed evenly;

[0048] Step 2): Add 8 g NaClO to the solution in step 1) for oxidation reaction, and then continuously drop 0.5 mol / L NaOH solution to control the pH of the reaction system at about 10, and react for 6 h;

[0049] Step 3): Filter the oxidized cellulose, wash it with deionized water for 5 times, and then perform ultrasonic dispersion to make a slurry, prepare a 2.0 mg / mL cellulose suspension, and place it in a sealed bottle with magnetic stirring for 10 days. After the stirring speed is 1500 rpm, put it in the refrigerator (below 4°C) and store it for later use;

[0050] Step 4): Take 100 mL of the cellulose suspension in step 3), add 0.07 g graphene and stir well, and use ultrasonic treatment to disperse the polymer evenly to obtai...

Embodiment 3

[0056] Step 1): Dissolve 0.016 g TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl radical) and 0.1 g NaBr in 100 mL deionized water, add 1 g bleached wood pulp fiber after completely dissolved , stir vigorously until the cellulose is dispersed evenly;

[0057] Step 2): Add 8 g NaClO to the solution in step 1) for oxidation reaction, then continuously add 0.5 mol / L NaOH solution dropwise to control the pH of the reaction system at about 10, and react for 6 h;

[0058] Step 3): Filter the oxidized cellulose, wash it with deionized water three times, and then perform ultrasonic dispersion to make a slurry, prepare a 2.0 mg / mL cellulose suspension, and place it in a sealed bottle with magnetic stirring for 6 days. Stir at a speed of 1500 rpm and store in the refrigerator (below 4°C) for later use;

[0059] Step 4): Take 100 mL of the cellulose suspension in step 3), add 0.07 g graphene and stir well, and use ultrasonic treatment to disperse the polymer evenly to obtain a stable cellul...

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Abstract

The invention relates to the field of intelligent materials, and discloses a preparation method of conductive hydrogel based on nanocellulose graphene polyvinyl alcohol polyethylenediamine. The methodcomprises the following steps: firstly, selecting polyvinyl alcohol and polyethylenediamine as matrixes of hydrogel; then uniformly dispersing the nano-crystalline cellulose graphene conductive compound serving as a nano-enhanced phase into a hydrogel matrix, so that the conductive hydrogel fiber is obtained by adopting a wet spinning method; and finally, carrying out post-treatment on the synthesized hydrogel by adopting a freezing and unfreezing circulation method. The invention discloses a conductive hydrogel based on nano-crystalline cellulose graphene polyvinyl alcohol polyethylenediamine. The hydrogel prepared by the method has huge application value in the fields of photoelectric devices, flexible wearable equipment, sensors and the like.

Description

technical field [0001] The invention relates to the field of smart materials, in particular to a method for preparing a conductive hydrogel based on nanocellulose-graphene-polyvinyl alcohol-polyethylenediamine. Background technique [0002] Hydrogel is a gel with water as the dispersion medium. A part of hydrophobic groups and hydrophilic residues are introduced into the water-soluble polymer with network crosslinked structure. The hydrophilic residues combine with water molecules, and the water Molecules are connected inside the network, and the cross-linked polymer in which the hydrophobic residues swell with water is a polymer network system, which is soft in nature, can maintain a certain shape, and can absorb a large amount of water. Conductive hydrogel not only has the high water content and biocompatibility of general hydrogel, but also enhances its conductivity and mechanical strength due to the addition of conductive substances. It is used in conductive films, coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/075C08J3/24C08L29/04C08L79/02C08L1/04C08K3/04C08K3/38C08B15/02D01F8/16D01F8/10D01F8/02D01F1/09
CPCC08J9/28C08J3/075C08J3/246C08B15/02D01F8/16D01F8/10D01F8/02D01F1/09C08J2205/022C08J2201/0484C08J2201/0482C08J2329/04C08J2479/02C08J2401/04C08K3/042C08K2003/387
Inventor 万军民武慧帅卢屹峥彭志勤王秉
Owner ZHEJIANG SCI-TECH UNIV
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