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Preparation method of graphene based nano composite hydrogel

A nanocomposite, graphene-based technology, applied in the field of preparation of nanocomposite hydrogels, can solve the problem that graphene-based hydrogels do not have both high mechanical properties and environmental responsiveness.

Inactive Publication Date: 2011-11-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, none of the currently reported graphene-based hydrogels possess high mechanical properties and environmental responsiveness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The following provides a method for preparing graphene-based nanocomposite hydrogel of the present invention, which may specifically include the following steps:

[0023] Step 101: Prepare graphene emulsion;

[0024] In step 101, the graphene emulsion can be prepared in the following manner: graphite obtains graphite oxide by an improved Hummers method; the graphite oxide is exfoliated and processed to obtain a graphene emulsion.

[0025] The peeling method may be one of pyrolysis expansion peeling method, ultrasonic peeling method, electrostatic repulsive peeling method, mechanical peeling method, and low temperature peeling method; the treatment method may choose one of direct dispersion, reduction, and PVA functionalization. Kind.

[0026] Regarding the specific process of preparing graphite oxide by the Hummers method, there have been quite a few documents describing it in this field, which belong to the basic knowledge well known to those skilled in the art, and will not b...

Embodiment 1

[0047] Highly water-soluble graphite oxide is prepared from flake graphite through an improved hummers method, and after ultrasonic peeling, a graphene oxide emulsion with a concentration of 40 mg / g is obtained.

[0048] Add 5g of graphene oxide emulsion with a concentration of 40mg / g, 5g of ultrapure water, and 2g of propionamide monomer with N 2 In the inlet reactor equipped with a stirring device, the stirring is through N 2 ; Then add 0.02g of initiator potassium persulfate and 16μl of catalyst N,N,N',N'-tetramethylethylenediamine, stir for 5 minutes, and transfer to glass tubes with diameters of 13mm and 6.3mm. After polymerization at ℃ for 24h, graphene-based nanocomposite hydrogel is obtained.

[0049] A universal material testing machine was used to test the mechanical properties of the hydrogel, and the results showed that its tensile breaking strength reached 0.5MPa, breaking elongation reached 1200%, and compressive strength reached 4.5MPa.

Embodiment 2

[0051] Highly water-soluble graphite oxide is prepared from flake graphite through an improved hummers method, and after ultrasonic peeling, a graphene oxide emulsion with a concentration of 40 mg / g is obtained.

[0052] Add 5g graphene oxide emulsion with a concentration of 40mg / g, 5g ultrapure water, 3g acrylamide monomer with N 2 In the inlet reactor equipped with a stirring device, the stirring is through N 2 ; Then add 0.02g of initiator potassium persulfate and 16μl of catalyst N,N,N',N'-tetramethylethylenediamine, stir for 5 minutes, and transfer to glass tubes with diameters of 13mm and 6.3mm. After polymerization at ℃ for 12h, graphene-based nanocomposite hydrogel is obtained.

[0053] This gel has a tensile breaking strength of 0.65MPa, a breaking elongation of 2000%, and a compressive strength of 5.5MPa.

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Abstract

The invention relates to a preparation method of a graphene based nano composite hydrogel, and belongs to the field of nano composite hydrogel preparation. An insitu polymerization method is adopted in the invention, which comprises the steps of: (1) preparing graphite into high water-soluble graphite oxide through an improved Hummers method and obtaining graphene emulsions of different varietiesand with different concentrations after peeling and processing; (2) uniformly mixing 1-10g of the graphene emulsions from step (1), 5-10g of water, 0.1-10g of water-soluble monomer, 0.005-0.5g of water-soluble initiator and 1-50[mu]l of catalyst, feeding in nitrogen for 1h to obtain a graphene pre-polymerized solution, and polymerizing under a certain temperature to obtain the graphene based nanocomposite hydrogel. The method of the present invention has a simple technology and is easy for operation; and the obtained nano composite hydrogel has excellent mechanical properties, restorability and environmental responsiveness. Therefore, the graphene based nano composite hydrogel has wide application prospects in biomedicine and machinery industry, etc.

Description

Technical field [0001] The invention belongs to the field of preparing nano composite hydrogels, and particularly relates to a method for preparing graphene-based nano composite hydrogels. Background technique [0002] Hydrogel is a polymer with a three-dimensional network structure that swells in water but does not dissolve in water. The network is composed of a macromolecular backbone and hydrophilic groups. It can absorb a large amount of water and swell significantly in water. After significant swelling, it can continue to maintain its original structure without being dissolved. [0003] In nature, many tissues of organisms are composed of hydrogel structures, among which eyes, skin, tissues and organs are important components of organisms. Hydrogel has excellent biocompatibility, and its physical properties are more like human tissue than any other synthetic materials. Therefore, in recent years, many explorations have been made in the application of hydrogels in biomedicine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F120/56C08F120/54C08F120/06C08F120/58C08F220/58C08F220/54C08F220/06C08K9/00C08K3/04
Inventor 李欢军杨宇
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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