Method for realizing modification of carbon nano-tube by using polymer crystallization

A technology of carbon nanotubes and polymers, which is applied in the direction of carbon nanotubes, nanotechnology for materials and surface science, nanocarbons, etc., to achieve the effects of weak force, simple process, and increased compatibility

Inactive Publication Date: 2008-01-30
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far, there is no literature report on the use of supercritical or compressed carbon dioxide to resist solvents to realize polymer-modified carbon nanotubes, and there is no other use of supercritical or compressed carbon dioxide as an anti-solvent to induce epigenetic crystallization of polymers. literature report

Method used

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  • Method for realizing modification of carbon nano-tube by using polymer crystallization

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Embodiment 1

[0024] Dissolve 1.0 mg of high-density polyethylene (HDPE) in 4 g of p-xylene at a constant temperature of 110 ° C, and at the same time, ultrasonically disperse 0.1 mg of single-walled carbon nanotubes in 1 g of p-xylene at 45 ° C to 50 ° C SWNTs, after the HDPE is completely dissolved and the SWNTs are completely dispersed, mix the p-xylene solution of HDPE and the SWNTs / p-xylene dispersion system at 110° C., and finally form the concentration of HDPE to 0.02wt%, and the concentration of SWNTs to be 0.002wt%. After the system is balanced, the p-xylene solution of HDPE / SWNTs is quickly transferred to the autoclave with a constant temperature of 110 °C; inject CO into the autoclave 2 to 9MPa, and maintain the high pressure for 3 hours, and finally slowly reduce the pressure to normal pressure, open the kettle and take out all the products, which are high-density polyethylene modified carbon nanotubes.

Embodiment 2

[0026] The amount of HDPE is 0.5mg, and the concentration of the finally formed HDPE is 0.01wt%. Others are the same as in Example 1.

Embodiment 3

[0028] The amount of HDPE was changed to 0.3 mg, and the concentration of the finally formed HDPE was 0.006 wt %, and the others were the same as in Example 1.

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Abstract

The invention relates to a method for realizing decoration of a carbon nano tube through polymer crystallization, in particular to induce polymer crystallization by using supercritical or compressive carbon dioxide as anti-solvent so as to achieve decoration. The method is carried as follows: the polymer prepared under constant temperature is dissolved in organic solvent solution 1; the carbon nano tube is evenly dispersed in the organic solvent under a temperature condition that is higher than the room temperature, so as to obtain a system 2; the ultimate density of the polymer and the carbon nano tube in the organic solvent after mixture is 0.003 to 0.1wt percent and 0.002 to 0.02 wt percent respectively for the mixture solution 1 and the system 2, thereby, a system 3 is obtained upon balance; then the system 3 is moved into a closed reactor and carbon dioxide is added into the reactor till the pressure in the reactor is 5 to 25MPa and be kept for 0.5 to 7 hours, finally the carbon nano tube decorated with the polymer crystallization is obtained after the pressure is reduced to a normal level. The method has simple technique, easy operation, notable effect and being environment protective, therefore, the performance of the carbon nano tube decorated with the polymer crystallization is good.

Description

(1) Technical field [0001] The invention relates to a method for modifying carbon nanotubes by using polymer crystallization, in particular to a method for modifying by using supercritical or compressed carbon dioxide as an antisolvent to induce polymer crystallization. (2) Background technology [0002] Carbon nanotubes are crystalline carbon, and their walls have the same structure as graphite. Generally, low-dimensional nanomaterials produced in large quantities have many defects and poor dispersion. In particular, the surface structure of carbon nanotubes often affects many properties such as electricity, mechanics and optics. These factors reduce the superior performance of carbon nanotubes as nanomaterials and affect the application of carbon nanotubes. In order to improve the surface structure of carbon nanotubes, surface modification methods are generally used to improve the dispersion, stability and compatibility with other substances of carbon nanotubes, and to e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B3/00
CPCB82Y40/00C01B31/0273C01B2202/28B82Y30/00C01B32/174Y02P20/54
Inventor 许群张智伟陈志民
Owner ZHENGZHOU UNIV
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