Polyethyleneimine functionalized carbon nanotube modified polyformaldehyde composite material and preparation method thereof

A technology of carbon nanotube modification and polyethyleneimine, which is applied in the field of materials, can solve the problems of weak bonding force between carbon nanotubes and polymer matrix interfaces, achieve the effect of improving crystallization behavior and mechanical properties, and improving thermal stability

Active Publication Date: 2019-12-03
HENAN UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Carbon nanotubes have an atomically smooth surface, so the interfacial bonding between carbon nanotubes and the polymer matrix is ​​relatively weak

Method used

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  • Polyethyleneimine functionalized carbon nanotube modified polyformaldehyde composite material and preparation method thereof
  • Polyethyleneimine functionalized carbon nanotube modified polyformaldehyde composite material and preparation method thereof
  • Polyethyleneimine functionalized carbon nanotube modified polyformaldehyde composite material and preparation method thereof

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[0028] The invention provides a preparation method of polyethyleneimine functionalized carbon nanotube modified polyoxymethylene composite material, comprising:

[0029] A) carbon nanotubes are mixed with acid to obtain carboxylated carbon nanotubes;

[0030] B) mixing and reacting carboxylated carbon nanotubes and polyethyleneimine in the presence of a condensing agent to obtain polyethyleneimine functionalized carbon nanotube products;

[0031] C) react polyoxymethylene and polyethylenimine functionalized carbon nanotube product, and form it to obtain the product.

[0032] The preparation method of the polyethyleneimine functionalized carbon nanotube-modified polyoxymethylene composite material provided by the invention firstly mixes the carbon nanotube with acid to obtain the carboxylated carbon nanotube.

[0033] Preferably, carbon nanotubes are subjected to ultrasonic treatment and oxidation treatment in a mixed acid solution to obtain carboxylated carbon nanotubes (MWNT...

Embodiment 1

[0058] Carbon nanotubes were oxidized by ultrasonic treatment in a mixed acid solution (volume ratio of concentrated sulfuric acid and concentrated nitric acid 3:1) for 1 to 10 hours to obtain carboxylated carbon nanotubes (MWNTs-COOH), and the product was washed with distilled water until neutral. dry;

[0059] Take the dried MWNTs-COOH and deionized water to form a solution in a flask, then place the flask in a water bath at a certain temperature and perform the following operations: first add 1-ethyl-(3-dimethylaminopropyl ) carbodiimide hydrochloride (EDC·HCl), add N-hydroxysuccinimide (NHS) after a period of time, react under stirring for 3h, then choose to add polyethyleneimine with a molecular weight of 2000, in Stir at room temperature for 8h. The polyethyleneimine functionalized carbon nanotube product was obtained, which was successively washed by centrifugation with distilled water several times, and dried;

[0060] Completely dissolve an appropriate amount of pol...

Embodiment 2

[0067] Carbon nanotubes were oxidized by ultrasonic treatment in a mixed acid solution (volume ratio of concentrated sulfuric acid and concentrated nitric acid 3:1) for 1 to 10 hours to obtain carboxylated carbon nanotubes (MWNTs-COOH), and the product was washed with distilled water until neutral. dry;

[0068] Take the dried MWNTs-COOH and deionized water to form a solution in a flask, then place the flask in a water bath at a certain temperature and perform the following operations: first add 1-ethyl-(3-dimethylaminopropyl ) carbodiimide hydrochloride (EDC·HCl), add N-hydroxysuccinimide (NHS) after a period of time, react under stirring for 6h, then choose to add polyethyleneimine with a molecular weight of 5000, in Stir at room temperature for 9h. The polyethyleneimine functionalized carbon nanotube product was obtained, which was successively washed by centrifugation with distilled water several times, and dried;

[0069] Add polyethyleneimine functionalized carbon nano...

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Abstract

The invention provides a preparation method of a polyethyleneimine functionalized carbon nanotube modified polyformaldehyde composite material. The preparation method comprises the following steps: A)mixing carbon nanotube with an acid to obtain carboxylated carbon nanotube; b) mixing and reacting the carboxylated carbon nanotube and polyethyleneimine in the presence of a condensing agent to obtain a polyethyleneimine functionalized carbon nanotube product; and C) reacting polyformaldehyde with the polyethyleneimine functionalized carbon nanotube product, and molding to obtain the product. According to the method disclosed by the invention, the polyethyleneimine functionalized carbon nanotubes can be uniformly dispersed in the polyformaldehyde matrix, and the interface bonding force between the carbon nanotubes and the polyformaldehyde is improved; therefore, the thermal stability of the polyformaldehyde composite material is improved, the crystallization behavior and the mechanical property are improved, and the polyformaldehyde composite material can be widely applied to the fields of automobiles, electronic appliances, machinery, precise instruments, building materials and thelike.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a polyethyleneimine functionalized carbon nanotube modified polyoxymethylene composite material and a preparation method thereof. Background technique [0002] Polyoxymethylene is a highly crystalline thermoplastic engineering plastic with excellent chemical properties, mechanical properties, corrosion resistance, creep resistance and self-lubricating properties. It is widely used in automobiles, mechanical equipment, electronic appliances and other fields. However, the polyoxymethylene molecular chain is arranged alternately by carbon-oxygen bonds (C-O), and two adjacent oxygen atoms have a strong activation effect on the methylene hydrogen atom, which makes the polyoxymethylene tend to depolymerize during processing, especially in the Under the action of heat and oxygen, free radicals are easily generated, and continuous degradation reactions occur. In addition, the regular ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L59/02C08L59/04C08K9/04C08K9/02C08K3/04C08L87/00C08G83/00
CPCC08G83/001C08K9/02C08K9/08C08L59/02C08L59/04C08L2201/08C08L2205/24C08K3/041C08L87/005
Inventor 张予东石家华李润明张旭亮常海波丁涛
Owner HENAN UNIVERSITY
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