Modified carbon nanotube and preparation method thereof

A carbon nanotube and nanotube technology, which is applied in the field of modified carbon nanotubes and its preparation, can solve the problems of thick coating layer, damaged carbon tube graphite structure, lack of active groups, etc., and achieves high electrical conductivity and good dispersion. Effect

Inactive Publication Date: 2014-04-16
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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.

Method used

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  • Modified carbon nanotube and preparation method thereof
  • Modified carbon nanotube and preparation method thereof
  • Modified carbon nanotube and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Preparation of multi-branched polyaniline

[0036] 0.9g aniline, 1.1g o-toluidine and 1.7g m-aminobenzenesulfonic acid were mixed respectively, and 150mL hydrochloric acid solution (0.2mol / L) was added in the mixture; 2 Under protection and at 0-5°C, mechanically stir for 30 minutes. Subsequently, 100 mL of ammonium persulfate (0.3 mol / L) solution was added dropwise and vigorously stirred. After the dropwise addition, keep warm for 5 hours until the reaction is complete, wash with dilute hydrochloric acid solution, acetone, deionized water, filter with suction, and vacuum dry at 50°C for 24 hours to obtain polyaniline with an intrinsic viscosity of 0.43dL / g. Its infrared spectrum, ultraviolet-visible spectrum, 1 H nuclear magnetic resonance spectrum, scanning electron microscope, X-ray diffraction spectrum, conductivity curve and thermogravimetric curve are respectively as attached figure 1 , 2 , 3, 4, 5, 6 and 7.

[0037] Add 1 g of polyaniline to 90 mL of dime...

Embodiment 2

[0056] 1. Preparation of multi-branched polyaniline

[0057] According to the technical scheme of Example 1, polyaniline with multiple branches was prepared.

[0058] 2. Preparation of modified carbon nanotubes

[0059] Add 1 g of carbon nanotubes and 0.033 g of polybranched polyaniline into 50 mL of dimethyl sulfoxide, stir at 25 °C and sonicate for 20 min, add 100 mL of methanol to precipitate, filter and wash, and dry in vacuum at 50 °C for 24 Hours, the modified carbon nanotubes were obtained. Its X-ray diffraction spectrum and Raman spectrum are as follows Figure 9 and 10 shown.

Embodiment 3

[0061] 1. Preparation of multi-branched polyaniline

[0062] According to the technical scheme of Example 1, polyaniline with multiple branches was prepared.

[0063] 2. Preparation of modified carbon nanotubes

[0064] Add 1 g of carbon nanotubes and 0.1 g of polybranched polyaniline into 50 mL of dimethyl sulfoxide, stir at 25 °C and sonicate for 20 min, add 100 mL of methanol to precipitate, filter and wash, and dry in vacuum at 50 °C for 24 Hours, the modified carbon nanotubes were obtained. Its X-ray diffraction spectrum, Raman spectrum and conductivity are as follows Figure 9 , 10 and 11.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/06C08K7/00C08K3/04C08G73/02C08G77/452C09C1/44C09C3/12
Inventor 梁国正强志翔顾嫒娟张志勇袁莉
Owner SUZHOU UNIV
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