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Method for stably dispersing graphene or/and carbon nanotubes in organic solvent

A technology of carbon nanotubes and organic solvents, applied in the field of nanomaterials, can solve problems such as unstable surface modification of graphene

Active Publication Date: 2013-02-06
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technical scheme can modify the surface of graphene with different functional groups by adding cationic polyelectrolytes, and utilize the electrostatic repulsion between the outer layer polyelectrolytes to realize its stable dispersion in the solution, but cationic polyelectrolytes are in graphite Alkene surface modification is unstable, and its stability needs to be further improved

Method used

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  • Method for stably dispersing graphene or/and carbon nanotubes in organic solvent
  • Method for stably dispersing graphene or/and carbon nanotubes in organic solvent
  • Method for stably dispersing graphene or/and carbon nanotubes in organic solvent

Examples

Experimental program
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Effect test

preparation example 1

[0025] The bio-based gallic acid epoxy resin was prepared according to the specification example 1 of the Chinese invention patent application with the application number 201110118776.X, which is a compound with the structure of formula I.

[0026]

Embodiment 1

[0028] Dissolve 0.01 gram of multilayer graphene and 0.01 gram of the bio-based gallic acid epoxy resin prepared in Preparation Example 1 into 10 mL of acetone, and ultrasonically disperse for 9 hours at an ultrasonic frequency of 20 KHz and an ultrasonic power of 100 W to obtain a dispersed Uniform multilayer graphene in acetone (graphene dispersion).

[0029] After the multilayer graphene acetone solution was left standing for 12 hours, no precipitation or stratification occurred, indicating that graphene was uniformly and stably dispersed in acetone, as follows figure 1 Shown in the reagent bottle on the right. Mix the above-mentioned multilayer graphene acetone solution (10 mL) with 100 g of commercially available epoxy resin (Dow Chemical, brand D.E.R331) and 60 g of curing agent hexahydrophthalic anhydride, and remove the solvent in a vacuum oven at 30 °C for 60 minutes , and then cured at 80°C for 2h, 130°C for 2h and 160°C for 2h, respectively, to obtain the multilaye...

Embodiment 2

[0032] Dissolve 1 gram of carbon nanotubes with a diameter of 10 nm and 6 grams of the bio-based gallic acid epoxy resin prepared in Preparation Example 1 into a mixed solvent consisting of 5 mL of dichloromethane and 5 mL of chloroform, and the total amount of the mixed solvent is 10 mL. Under the condition of frequency of 90KHz and ultrasonic power of 150W, ultrasonic dispersion is performed for 30 minutes to obtain a uniformly dispersed carbon nanotube dispersion.

[0033] After the carbon nanotube dispersion was left to stand for 12 hours, no precipitation or delamination occurred, indicating that the carbon nanotubes were uniformly and stably dispersed in the mixed solvent, as follows figure 2 Shown in the reagent bottle on the right. The above carbon nanotube dispersion (10 mL) was mixed with 100 g of commercially available epoxy resin (Dow Chemical, brand D.E.R331) and 60 g of curing agent hexahydrophthalic anhydride, and the solvent was removed in a vacuum oven at 30 ...

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Abstract

The invention discloses a method for stably dispersing graphene or / and carbon nanotubes in organic solvent. The method includes steps of dispersing graphene or / and carbon nanotubes and bio-based gallic acid epoxy resin into the organic solvent under action of ultrasonic to obtain uniform and stable graphene or / and carbon nanotube dispersing liquid. The method is simple, requires simple equipment, and is low in production cost. The graphene or / and carbon nanotube dispersing liquid prepared by the method is high in stability and good in dispersibility, and accordingly provides necessary technical preparation for producing high-performance graphene or / and carbon nanotube composite materials. During parathion of the graphene or / and carbon nanotube composite material, the bio-based gallic acid epoxy resin can not only serve as a dispersing agent but serve as an interference compatilizer for improving interference interaction of the graphene or / and carbon nanotubes and the epoxy resin matrix.

Description

technical field [0001] The invention relates to the technical field of nanometer materials, in particular to a method for stably dispersing graphene or / and carbon nanotubes in an organic solvent. Background technique [0002] Graphene and carbon nanotubes have large specific surface area, high electrical conductivity, high thermal conductivity and excellent mechanical properties, so that they can be used as functional fillers and additives to improve the performance of polymers, thereby preparing high-performance nanocomposites Material. In the application process of graphene or / and carbon nanotubes, how to stably disperse them in low-boiling organic solvents is one of the effective ways to prepare high-performance nanocomposites and give full play to the nanoeffects of graphene or / and carbon nanotubes one. However, there are strong van der Waals forces or hydrogen bonds between graphene and / or carbon nanotubes, making them prone to agglomeration rather than stable dispers...

Claims

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Application Information

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IPC IPC(8): C09C1/44C09C3/08
Inventor 刘小青曹丽军朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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