Preparation for polymer and method for chemically modifying carbon nano-tube

A technology of carbon nanotubes and polymers, applied in the field of materials, can solve the problems that the advantages cannot be fully exerted, and the composite materials are not ideally aggregated.

Inactive Publication Date: 2008-01-16
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, carbon nanotubes with a micron-scale length are insoluble in water and organic solvents, and are usually mixed with a polymer solution to form a suspoemulsion state. In the final composite material, there is an undesirable aggregation state, and the intertwined carbon nanotube coils are not formed. unable to give full play to its own advantages

Method used

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  • Preparation for polymer and method for chemically modifying carbon nano-tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Single-walled carbon nanotubes prepared by polystyrene-modified chemical vapor deposition

[0026] (a) Preparation of PSt-Br

[0027] Put CuBr / Bipy in the reaction flask with a molar ratio of 1:3, seal it, vacuumize it, fill it with nitrogen, and repeat the operation 3 times to ensure that the ATRP reaction is carried out in an oxygen-free environment. Inject styrene monomer and an appropriate amount of dimethyl sulfoxide with a syringe, and stir at room temperature for 1 hour. Then the temperature was raised to 110° C., and ethyl α-bromopropionate (EBP) (CuBr:EBP:Bipy=1 mol:1 mol:3 mol) was injected. After reacting for 4 hours, tetrahydrofuran was added into the reaction flask, and after fully dissolving, it was precipitated in methanol. After filtration, the filter cake was re-dissolved in tetrahydrofuran and precipitated in methanol. After repeating the operation 3 times, it was filtered and vacuum-dried to obtain a white powder.

[0028] (b)PSt-N 3 preparation ...

Embodiment 2

[0033] Double-walled carbon nanotubes prepared by polystyrene-modified chemical vapor deposition

[0034] (a) Preparation of PSt-Br

[0035] Put CuBr / Bipy in the reaction flask with a molar ratio of 1:3, seal it, vacuumize it, fill it with nitrogen, and repeat the operation 3 times to ensure that the ATRP reaction is carried out in an oxygen-free environment. Inject styrene monomer and an appropriate amount of dimethyl sulfoxide with a syringe, and stir at room temperature for 1 hour. Then the temperature was raised to 110° C., and ethyl α-bromopropionate (EBP) (CuBr:EBP:Bipy=1 mol:1 mol:3 mol) was injected. After reacting for 4 hours, tetrahydrofuran was added into the reaction flask, and after fully dissolving, it was precipitated in methanol. After filtration, the filter cake was re-dissolved in tetrahydrofuran and precipitated in methanol. After repeating the operation 3 times, it was filtered and vacuum-dried to obtain a white powder.

[0036] (b)PSt-N 3 preparation ...

Embodiment 3

[0041] Single-walled carbon nanotubes prepared by poly(tert-butyl methacrylate) modified chemical vapor deposition

[0042] (a) Preparation of PtBmA-Br

[0043] Put CuBr / Bipy in the reaction flask with a molar ratio of 1:3, seal it, vacuumize it, fill it with nitrogen, and repeat the operation 3 times to ensure that the ATRP reaction is carried out in an oxygen-free environment. Inject tert-butyl methacrylate monomer and appropriate amount of dimethyl sulfoxide with a syringe, and stir at room temperature for one hour. Then the temperature was raised to 80° C., and ethyl α-bromopropionate (EBP) (CuBr:EBP:Bipy=1 mol:1 mol:3 mol) was injected. After reacting for 4 hours, tetrahydrofuran was added into the reaction flask, and after fully dissolving, it was precipitated in methanol. After filtration, the filter cake was re-dissolved in tetrahydrofuran and precipitated in methanol. After repeating the operation 3 times, it was filtered and vacuum-dried to obtain a white powder.

...

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Abstract

The invention discloses a preparation method of an azido blocking polymer and a method of the chemical modification of the azido blocking polymer for the surface of carbon nano tubes. Polymer whose end group is provide with a halogen is synthesized by the means of atom transfer free radical polymerization, and the halogens are transferred into azide groups through azido reaction, then the polymer whose end groups are the azide groups is obtained. The polymer is connected to the surface of the carbon nano tubes by means of a cycloaddition reaction between azido and single-walled or multi-walled carbon nano tubes, the chemical modification to the carbon nano tube is realized. The azide groups are used as a medium to make polymer graft, so as to avoid the damage to the tube walls of the carbon nano tubes and the cutting to the carbon nano tubes caused by the acid treatment, therefore, the soluble all carbon nano tubes can be obtained. The invention is of important significance in the studies and applications of the chemical and physical properties of the soluble carbon nano tubes.

Description

technical field [0001] The invention belongs to the field of materials and relates to a method for chemically modifying and functionalizing the surface of carbon nanotubes by polymers. Background technique [0002] Carbon nanotubes have excellent physical, chemical and mechanical properties, and they have great potential application value in many aspects. The preparation of carbon nanotube / polymer composite materials can improve the mechanical properties of polymers, prepare photoelectric functional materials, lubricating additives, etc. At present, polymer / carbon nanotube composites have become the main research and application direction of carbon nanotubes. However, carbon nanotubes with a micron-scale length are insoluble in water and organic solvents, and are usually mixed with a polymer solution to form a suspoemulsion state. In the final composite material, there is an undesirable aggregation state, and the intertwined carbon nanotube coils are not formed. Can not gi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F12/08C08F20/00C09C3/10C09C1/44
Inventor 王国建董玥刘琳
Owner TONGJI UNIV
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