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Method for preparing core-shell type carbon nanotube conductive fillers by virtue of controllable coating technology

A carbon nanotube and conductive filler technology, which is applied in the field of composite material preparation, can solve problems such as poor compatibility, uneven coating, and difficult production, and achieve the effects of improved dispersion, uniform coating, and simple operation

Active Publication Date: 2015-03-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, acidification treatment severely damages the structure of carbon nanotubes, which greatly affects their performance. For this reason, many workers have tried to modify carbon nanotubes by using conjugated double bonds or physical adsorption on the surface of carbon nanotubes in recent years. , but the result obtained is either that the coating is not uniform enough, or the cost is too high, and it is difficult to carry out large-scale production
Unmodified carbon nanotubes have poor dispersion in organic solvents and poor compatibility with most polymers, which seriously affects the performance of composite materials

Method used

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  • Method for preparing core-shell type carbon nanotube conductive fillers by virtue of controllable coating technology
  • Method for preparing core-shell type carbon nanotube conductive fillers by virtue of controllable coating technology
  • Method for preparing core-shell type carbon nanotube conductive fillers by virtue of controllable coating technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Weigh 150 mg of carbon nanotubes, place them in a three-necked flask, add 150 ml of N, N dimethylformamide (DMF) as a solvent, ultrasonically disperse for 45 min, add 25 mg of initiator azobisisobutyronitrile and continue ultrasonication for 10 min. Measure 0.15g of divinylbenzene (DVB) monomer and add it into the dropping device after dilution. The three-necked flask was moved into an oil bath, and stirred at room temperature for 1 h under the protection of nitrogen. The temperature was raised to 80°C, and the divinylbenzene (DVB) monomer in the dropping device was gradually added dropwise to carry out the polymerization reaction. After 12h, the heating was stopped to end the reaction. The product was obtained by suction filtration, washed with water and methanol respectively for 30 min, and finally the target product was obtained by suction filtration. figure 2 (a) is the core-shell composite of divinylbenzene-coated carbon nanotubes prepared in this example (the s...

Embodiment 2

[0035] Weigh 150 mg of carbon nanotubes, place them in a three-necked flask, add 150 ml of N,N dimethylformamide (DMF) as a solvent, and disperse them ultrasonically for 45 minutes. Add 25 mg of initiator azobisisobutyronitrile and continue sonication for 10 min. Measure 0.45g of divinylbenzene (DVB) monomer and add it into the dropping device after dilution. The three-necked flask was moved into an oil bath, and stirred at room temperature for 1 h under the protection of nitrogen. The temperature was raised to 80°C, and the monomer was gradually added dropwise to carry out the polymerization reaction. After 12h, the heating was stopped to end the reaction. The product was obtained by suction filtration, washed with water and methanol respectively for 30 min, and finally the target product was obtained by suction filtration. figure 2 (b) is a transmission electron micrograph of the core-shell composite of divinylbenzene-coated carbon nanotubes prepared in this example. It...

Embodiment 3

[0037]Weigh 150 mg of carbon nanotubes, place them in a three-necked flask, add 150 ml of N, N dimethylformamide (DMF) as a solvent, ultrasonically disperse for 45 min, add 25 mg of initiator azobisisobutyronitrile and continue ultrasonication for 10 min. Measure 0.75g of divinylbenzene (DVB) monomer, add it into the dripping device after dilution. The three-necked flask was moved into an oil bath, and stirred at room temperature for 1 h under the protection of nitrogen. The temperature was raised to 80°C, and the monomer was gradually added dropwise to carry out the polymerization reaction. After 12h, the heating was stopped to end the reaction. The product was obtained by suction filtration, washed with water and methanol respectively for 30 min, and finally the target product was obtained by suction filtration. figure 2 (c) is a transmission electron micrograph of the core-shell composite of divinylbenzene-coated carbon nanotubes prepared in this example. It can be seen...

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Abstract

The invention provides a method for preparing core-shell type carbon nanotube conductive fillers by virtue of a controllable coating technology. The method is mainly characterized in that the adsorption of the core-shell type carbon nanotube conductive fillers for multi-wall carbon nanotubes is realized by virtue of the adsorption action of the multi-wall carbon nanotubes for micromolecules, the surfaces of the carbon nanotubes are activated by azodiisobutyronitrile to generate active free radical centres and the polymerization-crosslinking of a divinyl benzene monomer is initiated, thus achieving a coating purpose. The preparation process comprises the following steps: ultrasonically dispersing the multi-wall carbon nanotubes in a solvent at first, and then adding an initiator, heating, reacting and gradually dripping the monomer; finally obtaining a series of core-shell type carbon nanotube conductive fillers with different coating thicknesses by adjusting the ratio among the various reactants. According to the method, the pre-treatment processes of acidification, oxidization and the like for the carbon nanotubes are not required, thus the own structures of the carbon nanotubes are not damaged, and the influence on the performances of the carbon nanotubes is less; the method is an effective way of preparing a core-shell type carbon nanotube compound, and has the advantages of simple process, flexible and wide applicability, wide industrialization prospect and the like.

Description

technical field [0001] The invention relates to a method for preparing core-shell composite powder by controllable polymerization of divinylbenzene with multifunctionality to coat original carbon nanotubes, and belongs to the technical field of composite material preparation. Background technique [0002] Carbon nanotubes are another new type of carbonaceous nanomaterials after fullerene. From the structural point of view, carbon nanotubes are formed by curling one or more layers of graphite sheets according to a certain helical angle, with a diameter of nanometers. Due to their unique mechanical, electronic and chemical properties, the order-of-magnitude cylindrical shell carbon nanotubes have become a research hotspot worldwide. a wide range of applications. [0003] The seamless tubular structure of carbon nanotubes and the good degree of graphitization of the tube endow carbon nanotubes with excellent mechanical properties. Conventional graphite fiber is an order of ma...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F212/36C09C1/44C09C3/10
Inventor 陈广新任烨李齐方孙达李翔
Owner BEIJING UNIV OF CHEM TECH
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