Method for preparing high water soluble nano carbon tube grafted by super branched polymer

A technology of hyperbranched polymers and carbon nanotubes, applied in the field of nanomaterials, can solve the problems of poor solubility of products, materials that cannot reflect the characteristics of carbon nanotubes, and low content of carbon nanotubes, and achieves water solubility and excellent dispersion. The effect of simple and easy-to-operate preparation method

Inactive Publication Date: 2009-12-16
BEIJING UNIV OF CHEM TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the content of carbon nanotubes is relatively small when polymers are grafted to modify carbon nanotubes, and the resulting materials cannot reflect the characteristics of carbon nanotubes; the polymer terminal active groups modified on the surface of carbon nanotubes are less, and the resulting products Poor solubility, etc.

Method used

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  • Method for preparing high water soluble nano carbon tube grafted by super branched polymer

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Using the multi-walled carbon nanotubes prepared by catalytic pyrolysis as the initial raw material, the carbon nanotubes are purified by strong oxidizing acid to remove impurities in the raw materials, and at the same time, the carbon nanotubes are chopped. Utilizing the action of active groups appearing on the surface of carbon nanotubes after chopping and polyamines, a certain hyperbranching initiating group is modified on the surface of carbon nanotubes. Then react with hyperbranched poly(amide-ester) (the number of hyperbranched polymers is five generations) synthesized by phenyl anhydride (benzene-1,2,4-tricarboxylic acid-1,2 anhydride) and diethanolamine to obtain hyperbranched Poly(amide-ester) grafted carbon nanotubes.

[0024] Step (a): Put 2 g of dry multi-walled carbon nanotubes and 40 mL of 60% concentrated nitric acid into a 100 mL flask equipped with a magnetic stirrer, and reflux for 24 h under magnetic stirring at 80 ° C; discard the upper layer liquid ...

Embodiment 2

[0029] On the basis of Example 1, step (a) is the same as Example 1, and the input amount of diethanolamine is changed to 1.4g in step (b), and 10% metaphthalic anhydride (benzene-1,2,4- Tricarboxylic acid-1,2 anhydride) and diethanolamine synthesized hyperbranched poly(amide-ester) (hyperbranched polymer generation number is five generations) DMF solution input amount is changed into 40mL, other conditions are constant, obtained black powder The graft modification of hyperbranched poly(amide-ester) carbon nanotubes.

[0030] Compared with the product obtained in the examples, the content of N elements (8.1%) and O elements (0.62% becomes 14%) changes more obviously in the elemental analysis, and the peak values ​​of amido and carboxyl groups in the XPS analysis results are higher than those in Example 1. The map is larger, the result is clearer and more obvious, and the dispersion performance of the modified product in water is improved to a certain extent (20mg / mL)

Embodiment 3

[0032] On the basis of Example 1, step (a) is the same as Example 1, and the input amount of diethanolamine is changed to 2.1g in step (b), and 10% metaphthalic anhydride (benzene-1,2,4- Tricarboxylic acid-1,2 anhydride) and diethanolamine synthesized hyperbranched poly(amide-ester) (hyperbranched polymer generation number is five generations) DMF solution input amount is changed into 50mL, other conditions are constant, obtained black powder The graft modification of hyperbranched poly(amide-ester) carbon nanotubes.

[0033] The obtained result product has some changes in the content of N element (9.7%) and O element (0.62% becomes 14.3%) relative to the result of the product of Example 2 in elemental analysis, and the peaks of amido and carboxyl in the XPS analysis results are also different from the spectrum of the embodiment Greater increase, the result further proves the grafting effect of amine group and hyperbranched polymer, and the dispersion performance of the modifi...

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Abstract

A method for preparing highly water-soluble carbon nanotubes by grafting and modifying hyperbranched polymers belongs to the field of nanomaterials. Carbon nanotubes are purified under the action of strong oxidizing acid, and active groups are formed on the tube walls and ports, and certain initiator groups appear on the surface under the modification of polyamines or polyols, and then hyperbranched polymerization is used to The effect of grafting and initiating groups on the surface of the carbon nanotubes has a large number of carboxyl or amine groups, so that the carbon nanotubes have a high degree of solubility and dispersibility in aqueous solvents, greatly The processability of carbon nanotubes is improved, paving the way for the application of carbon nanotubes in composite materials, hydrogen storage, electronic devices, sensors, biomaterials and other fields.

Description

technical field [0001] The invention relates to a surface-modified carbon nanotube and a preparation method thereof, in particular to a super-high water-soluble carbon nanotube grafted by a hyperbranched polymer and a preparation method thereof, belonging to the field of nanomaterials. Background technique [0002] As human beings realize that nanotechnology will become the leading technology in the 21st century, it is more and more urgent for people to master and utilize nanotechnology, so as to realize all-round leapfrog development of society, economy and science and technology. Among them, the discovery of carbon nanotubes is a milestone in the history of the world. In the past ten years, carbon nanotubes have been the focus of scientific research in the world. Due to their unique internal structure (aspect ratio, chirality, etc.) New one-dimensional nanomaterials have important application prospects in many fields and are one of the most promising nanomaterials in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/02C30B33/00C30B29/62C01B31/02B01J2/30
Inventor 程斌丁顶
Owner BEIJING UNIV OF CHEM TECH
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