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Nano carbon fiber surface modification method

A nano-carbon fiber and surface modification technology, which is applied in the direction of carbon fiber, fiber treatment, ultrasonic/sonic fiber treatment, etc., can solve problems such as structural damage, performance degradation of nano-carbon fiber, and fracture of nano-carbon fiber, achieving improved compatibility, simple operation, The effect of stabilizing dispersion

Inactive Publication Date: 2019-08-16
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are some defects in the commonly used surface modification methods of carbon nanofibers: the use of chemical treatment methods such as surface oxidation will cause the carbon nanofibers to bend, twist, and break, destroying the structure and degrading the performance of the carbon nanofibers. At the same time, a large amount of strong oxidant is used, which makes it difficult to treat the waste liquid after treatment, and the polluting gas generated during the reaction will cause great harm to the environment
However, using a single non-covalent modification method will not damage the structure of carbon nanofibers and cause less pollution, but its dispersion effect is worse than that of covalent modification.

Method used

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Experimental program
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Effect test

Embodiment 1

[0023] (1) The first step of pretreatment of carbon nanofibers: the untreated carbon nanofibers are treated with a low-temperature plasma instrument, the treatment time is 10s, and the treatment power is 100W. After the reaction is over, leave the processed carbon nanofibers for the second step of processing;

[0024] (2) Coating the carbon nanofibers treated in step (1) with polydopamine: Mix 0.788g of Tris and 14.7ml of hydrochloric acid solution with a concentration of 0.1000mol / L, and dilute with water to 100ml , configured as a Tris buffer solution, adding 0.1g of carbon nanofibers and 0.1g of polydopamine powder into the Tris buffer solution, and stirring on a magnetic stirrer;

[0025] (3) Use a coupling agent to couple and modify the carbon nanofibers treated in step (2): dissolve 0.001g of silane coupling agent KH550 in 20ml of absolute ethanol, stir well, and wait for 12 hours after step (2) , add an ethanol solution containing a coupling agent, continue to stir for...

Embodiment 2

[0027] (1) The first step of pretreatment of carbon nanofibers: the untreated carbon nanofibers are treated with a low-temperature plasma instrument, the treatment time is 20s, and the treatment power is 300W. After the reaction is over, leave the processed carbon nanofibers for the second step of processing;

[0028] (2) Coating the carbon nanofibers treated in step (1) with polydopamine: mix 0.788g of Tris and 15.3ml of hydrochloric acid solution with a concentration of 0.1000mol / L, and dilute to 100ml with water , configure a Tris buffer solution, add 0.1g nano-carbon fiber and 0.07g polydopamine powder to the Tris buffer solution, and stir on a magnetic stirrer;

[0029] (3) Use a coupling agent to couple and modify the carbon nanofibers treated in step (2): dissolve 0.002g of silane coupling agent KH560 in 20ml of absolute ethanol, stir evenly, and wait for 12 hours after the stirring time of step (2) , add an ethanol solution containing a coupling agent, continue to sti...

Embodiment 3

[0031] (1) The first step of pretreatment of carbon nanofibers: the untreated carbon nanofibers were treated with a low-temperature plasma instrument, the treatment time was 70s, and the treatment power was 100W. After the reaction is over, leave the processed carbon nanofibers for the second step of processing;

[0032] (2) Coating the carbon nanofibers treated in step (1) with polydopamine: Mix 0.788g of Tris and 16.7ml of hydrochloric acid solution with a concentration of 0.1000mol / L, and dilute to 100ml with water , configure a Tris buffer solution, add 0.1g nano-carbon fiber and 0.04g polydopamine powder to the Tris buffer solution, and stir on a magnetic stirrer;

[0033] (3) Use a coupling agent to couple and modify the carbon nanofibers treated in step (2): dissolve 0.002g of silane coupling agent KH570 in 20ml of absolute ethanol, stir evenly, and wait for 24 hours after the stirring time of step (2) , add an ethanol solution containing a coupling agent, continue to ...

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Abstract

The invention belongs to the field of fine chemical engineering and relates to a nano carbon fiber surface modification method. The method comprises steps as follows: (1) nano carbon fiber is treatedwith low-temperature plasma; (2) surface coating is performed on the nano carbon fiber treated in the step (1) with polydopamine; (3) the nano carbon fiber treated in the step (2) is modified with a coupling agent. By means of the nano carbon fiber surface modification method, the surface of nano carbon fiber is coated with polydopamine, and the coupling agent is adsorbed on the outer layer of polydopamine, so that the nano carbon fiber can be stably dispersed in water or an organic solvent. Compared with the prior art, the dispersion performance of the nano carbon fiber can be improved on thebasis that the structure of the nano carbon fiber is not damaged, and the method has the advantages of being simple to operate, free of toxic reagents, free from pollution, good in dispersion effectand the like.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a method for modifying the surface of carbon nanofibers. Background technique [0002] Theoretical and experimental studies have shown that carbon nanofiber is a high-strength, high-modulus carbon material with a carbon content of more than 95%, and has the characteristics of high specific strength, ultra-high temperature resistance, fatigue resistance, and good electrical conductivity. So carbon nanofibers have great potential as polymer matrix and modifier. However, the dispersion of carbon nanofibers in the polymer matrix has been a key issue hindering its high performance. Surface treatment of carbon nanofibers is an important method to improve their dispersion. At present, the surface treatment of carbon nanofibers can be divided into physical methods and chemical methods according to the process. The former mainly includes coating method and plasma treatment method, and the ...

Claims

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Application Information

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IPC IPC(8): D06M13/513D06M15/37D06M10/02D06M13/368D06M101/40
CPCD06M10/025D06M13/368D06M13/513D06M15/37D06M2101/40
Inventor 丁永红郭亮李永超
Owner CHANGZHOU UNIV
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