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Modifiable carbon nanotubes with reaction activity and preparation method thereof

A carbon nanotube and reactive technology, which is applied in the field of modifiable carbon nanotubes and its preparation, can solve the problems of affecting the interface bonding between carbon nanotubes and matrix materials, affecting electrical properties and mechanical properties, and structural damage of carbon nanotubes, etc. The effects of simple preparation method, low cost and complete structural protection are achieved.

Inactive Publication Date: 2020-01-07
HEBEI NORTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The covalent functionalization method is to improve the dispersion of carbon nanotubes by forming functional groups on the surface of carbon nanotubes, but this process destroys the structure of carbon nanotubes to a certain extent, thus affecting their electrical and mechanical properties.
The non-covalent functionalization method mainly uses surfactants, polymers or biomacromolecules to modify carbon nanotubes. The treated carbon nanotubes can maintain their structural integrity to the greatest extent. Amount needs to be controlled and degree of modification is limited
Excessive amount of modifier will not only increase the cost, but also affect the interfacial bonding between carbon nanotubes and matrix materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Add 5g of carbon nanotubes, 100g of concentrated sulfuric acid (98wt%), and 35g of concentrated nitric acid (65wt%) into a 500ml Erlenmeyer flask, perform ultrasonic purification for 8h, and the ultrasonic power is 500w. Add 400 mL of deionized water for dilution, centrifuge the mixed acid and carbon nanotubes, wash and centrifuge with 95% ethanol several times to obtain carbon nanotubes, until the pH is 6.5-7.0. Add 5g of sodium hydroxide and 5g of deionized water to the obtained carboxylated carbon nanotubes, ultrasonically disperse and sodiumize, the power is 500w, the temperature is 30°C, and the time for ultrasonic dispersion and sodiumization is 10min; after centrifuging the carbon nanotubes, use 95% Wash with ethanol several times until pH: 7.0-7.5, dry at 110° C., and grind to obtain sodium carboxylated carbon nanotubes. Add 100g of deionized water, 10g of sodium carboxylated carbon nanotubes, 0.1g of benzyltriethylammonium chloride, and 8g of allyl bromide into...

Embodiment 2

[0033] Add 1 g of carbon nanotubes, 100 g of concentrated sulfuric acid (98 wt%), and 45 g of hydrogen peroxide (30 wt%) into a 500 ml Erlenmeyer flask, perform ultrasonic purification for 2 h, and use an ultrasonic power of 1200 w. Add 400 mL of deionized water for dilution, centrifuge the mixed acid and carbon nanotubes, wash and centrifuge with 95% ethanol several times to obtain carbon nanotubes, until the pH is 6.5-7.0. Add 1 g of sodium hydroxide and 1 g of deionized water to the obtained carboxylated carbon nanotubes, ultrasonically disperse and sodiumize them, the power is 1200w, the temperature is 30°C, the time for ultrasonic dispersion and sodiumization is 5min; after centrifuging the carbon nanotubes, use 95% Wash with ethanol several times until pH: 7.0-7.5, dry at 110° C., and grind to obtain sodium carboxylated carbon nanotubes. Add 100 g of deionized water, 1 g of sodium carboxylated carbon nanotubes, 1 g of 4-chloromethyl styrene, and 0.05 g of tetra-n-octyl a...

Embodiment 3

[0035]Add 0.1 g of carbon nanotubes, 100 g of concentrated sulfuric acid (98 wt%), and 50 g of ammonium peroxodisulfate (purity ≥ 98%) into a 500 ml Erlenmeyer flask, perform ultrasonic purification for 1 h, and use ultrasonic power of 2000 w. Add 400 mL of deionized water for dilution, centrifuge the mixed acid and carbon nanotubes, wash and centrifuge with 95% ethanol several times to obtain carbon nanotubes, until the pH is 6.5-7.0. Add 0.1g of sodium hydroxide and 0.1g of deionized water to the obtained carboxylated carbon nanotubes, ultrasonically disperse and sodiumize them, the power is 2000w, the temperature is 40°C, the time for ultrasonic dispersion and sodiumization is 1min; the carbon nanotubes are centrifuged and used Wash with 95% ethanol several times until the pH is 7.0-7.5, dry at 110° C., and grind to obtain sodium carboxylated carbon nanotubes. Add 100g of deionized water, 5g of sodium carboxylated carbon nanotubes, 5g of 6-bromo-1-hexene, and 0.3g of dodecy...

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Abstract

The invention provides modifiable carbon nanotubes with reaction activity and a preparation method thereof. According to the method, original carbon nanotubes are used as raw materials; carboxyl reaction points are formed through strong acid purification and carboxylation; under the action of a phase transfer agent, halogenated hydrocarbon modifiers containing double bonds are successfully connected to the surfaces of the carbon nanotubes; and finally, the modifiable carbon nanotubes containing a certain amount of reaction active points and having reaction activity are prepared. The preparation method is simple and easily controllable in process and high in repeatability, and avoids the use of a solvent; the surface of the prepared modifiable carbon nanotube with reaction activity containsa large number of reaction active groups; the structure of the carbon nanotube is completely protected, and the original functional characteristics of the carbon nanotube are not influenced; and theprepared modifiable carbon nanotube with reaction activity can be further designed and modified to realize functionalization of the carbon nanotube, and can also be used for preparing a composite material through a graft polymerization reaction.

Description

technical field [0001] The invention relates to the technical field of carbon nanotube modification, in particular to a reactive modifiable carbon nanotube and a preparation method thereof. Background technique [0002] Carbon nanotubes have unique surface effects, small size effects, and quantum size effects. The unique hollow tubular structure endows them with excellent mechanical, magnetic, and thermal properties. Therefore, they are widely used in aerospace materials, medical, electronics, etc. and other cutting-edge fields. With the continuous improvement of the preparation technology of carbon nanotubes, people have been able to produce a large number of low-cost carbon nanotubes, but there are still some problems, such as the surface of carbon nanotubes is chemically inert, lacks active groups, and is easy to entangle with each other. Together, the solubility of carbon nanotubes in various solvents is very low, and the dispersion in the polymer matrix is ​​uneven; in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/168C01B32/174
CPCC01B32/168C01B32/174
Inventor 袁立焕魏珍沈小宁王永利刘家园
Owner HEBEI NORTH UNIV
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