Modified carbon nanotube and preparation method thereof

Abstract

The invention discloses a modified carbon nanotube and a preparation method thereof. The method comprises the following steps: dissolving polyaniline in dimethylsulfoxide, and dropwisely adding epoxy trialkoxysilane and hydrochloric acid to obtain organosilicon-modified polyaniline; dissolving the organosilicon-modified polyaniline in dimethylsulfoxide, adding deionized water and hydrochloric acid, and obtaining highly branched chain polyaniline after the reaction finishes; adding carbon nanotube and the highly branched chain polyaniline into dimethylsulfoxide, precipitating in methanol, carrying out vacuum filtration, and washing to obtain the carbon nanotube. The highly branched chain polyaniline conductive layer is coated on the surface of the carbon nanotube, and the content of the coating layer can be regulated to control the conductivity of the modified carbon nanotube, thereby providing possibility for preparing conductive and dielectric materials with functions of high dielectric constant, low dielectric loss and the like as well as regulating and controlling properties. The polysiloxane contains epoxy, hydroxy and other active groups, thereby providing foundation for compounding the modified carbon nanotube with resin. The preparation method has the characteristics of wide applicability and simple operating technique.

Description

technical field [0001] The invention relates to a modified carbon nanotube and a preparation method thereof. Background technique [0002] Carbon nanotubes have attracted widespread attention from scientists all over the world since their discovery due to their light weight, high strength and excellent electrical properties. At present, people add carbon nanotubes as conductors to polymers to prepare high-performance conductive or dielectric materials. A large number of studies have shown that the excellent electrical conductivity of carbon nanotubes comes from its perfect network structure, while the electrical conductivity and dielectric properties of carbon nanotubes / polymer composites depend not only on the performance of carbon nanotubes, but also on the Good dispersion of carbon nanotubes in polymers and good interfacial force with polymers. Therefore, the modification of carbon nanotubes is the prerequisite for the application of carbon nanotubes and related materia...

AI Technical Summary

Problems solved by technology

Although the coating of a large amount of polypyrrole is beneficial to overcome the problem that carbon nanotubes are easy to agglomerate, the thick coating layer is not conducive to the exertion of the electrical properties of carbon nanotubes; at the same time, the modified carbon nanotubes lack the ability to react with the polymer matrix. It is difficult to ensure the uniform and stable dispersion of modified carbon nanotubes in the matrix and obtain good interfacial force

[0006] It can be seen from the above existing technologies that although the current modified carbon nanotube preparation technology has achieved the purpose of modification in some aspects, it will inevitably significantly damage the perfect graphite structure of carbon nanotubes, resulting in a decrease in their excellent performance.

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