Surface modification method of multi-walled carbon nanotubes

Abstract

The invention relates to a surface modification method of multi-walled carbon nanotubes; terephthalic acid is adopted as a modifying material according to the characteristics of the multi-walled carbon nanotubes and polymeric matrixes, ultrasonic dispersion and ethylene glycol coating can be carried out on the multi-walled carbon nanotube in an ultrasonic dispersion machine, surface modification is carried out under the states of oil bath, heating, stirring, nitrogen protection and water circulation condensation in a four-port flask, and the coated and modified multi-walled carbon nanotube can be prepared after washing, extraction filtration and vacuum drying are carried out, the thickness of a coating layer can reach 5-15nm, the diameter is 40-60nm, and the length is 20mum, chemical physical properties are stable, agglomeration is hard, various chemical substances can be matched, the compatibility is good, the process in the surface modification method is advanced, a used equipment material is less, the process flow is short, and the magnitude is completely accurate, therefore, the method is very ideal.

Description

technical field [0001] The invention relates to a method for surface modification of multi-walled carbon nanotubes, belonging to the technical field of surface modification and performance modification of inorganic carbon materials. Background technique [0002] The diameter of multi-walled carbon nanotubes (MWNTs) ranges from a few nanometers to tens of nanometers, the length is generally several microns to tens of microns, sometimes up to millimeters, and its aspect ratio can reach more than 1000. It has a unique structure and performance. It is an additive material with excellent performance and has been widely used in the preparation of polymer-based composite materials. Due to its large specific surface area and high surface energy, it is easy to agglomerate, and its bonding force with the polymer matrix interface is weak. Capacitance is poor, and these defects limit the application of multi-walled carbon nanotubes in polymer matrix composites. [0003] In order to ove...

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Problems solved by technology

[0002] The diameter of multi-walled carbon nanotubes (MWNTs) ranges from a few nanometers to tens of nanometers, the length is generally several microns to tens of microns, sometimes up to millimeters, and its aspect ratio can reach more than 1000, with unique structures and properties. It is an additive material with excellent performance and has been widely used in the preparation of polymer-based composite materials. Due to its large specific surface area and high surface energy, it is easy to agglomerate, and its bonding force with the polymer matrix interface is weak. Capacitance is poor, and these defects limit the application of multi-walled carbon nanotubes in polymer matrix composites

[0003] In order to overcome the application defects of multi-walled carbon nanotubes, the surface must be modified to change the surface properties of multi-walled carbon nanotubes to solve the problems of dispersion and compatibility. The commonly used method is acidification, through physical, chemical or The grafting or coating of coupling agent, polymer or metal layer by electrochemical method is often ineffective, and some can only be modified at the ports or defects of multi-walled carbon nanotubes, which has limited effect, and some will be modified by physical action. Carboxypyrene or silane coupling agent for coating, but this method is greatly affected by thermodynamic factors, the surface coating layer is unstable and easily damaged, and cannot play a good reinforcing effect

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