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Method for preparing carbon nano-tube used for RAFT polymerization chain transfer agent

A carbon nanotube and transfer agent technology, applied in the field of materials, can solve the problems of high reactivity, uncontrollable molecular weight, and low reactivity of carbon nanotubes, such as chemical bonding, and achieves good dispersion effect.

Inactive Publication Date: 2009-06-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both have their own advantages and disadvantages. The molecular weight of the polymer used in the former can be determined, but due to the low reactivity of carbon nanotubes, it is not easy to produce chemical bonds. The latter has a slightly higher reactivity but its molecular weight is uncontrollable.

Method used

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  • Method for preparing carbon nano-tube used for RAFT polymerization chain transfer agent
  • Method for preparing carbon nano-tube used for RAFT polymerization chain transfer agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: In a 250mL single-neck round bottom flask equipped with a magnetic stirrer, add 100mg of dry single-walled carbon nanotubes and 100mL of oleum with a sulfur trioxide content of 20%, and after magnetic stirring for 3 hours, add 5.779g4 -Bromoaniline, 2.318g of sodium nitrite and 0.28g of azobisisobutyronitrile, heated to 80°C, magnetically stirred and refluxed for 1h. The obtained product was first diluted with 1 L of deionized water, then suction-filtered with a polytetrafluoroethylene microporous membrane with a pore size of 0.22 μm, and washed repeatedly with deionized water until neutral, and then washed 5 times with tetrahydrofuran. After vacuum drying at 60° C. for 24 hours, 0.129 g of bromine-based carbon nanotubes were obtained.

[0020] Add 100 mL of anhydrous tetrahydrofuran, 100 mg of bromine-based carbon nanotubes and 0.8 g of polished magnesium strips into a 250 mL three-necked round-bottom flask equipped with a magnetic stirrer, heat to 40 ° C, a...

Embodiment 2

[0022] Example 2: Add 50 mg of dry multi-walled carbon nanotubes and 100 mL of oleum with a sulfur trioxide content of 20% in a 250 mL single-necked round bottom flask equipped with a magnetic stirrer, and after magnetic stirring for 3 hours, add 3.125 g 4-Bromo-3-methylaniline, 1.159g of sodium nitrite and 0.14g of azobisisobutyronitrile were heated to 80°C, magnetically stirred and refluxed for 1h. The obtained product was first diluted with 500 mL of deionized water, then suction-filtered with a polytetrafluoroethylene microporous membrane with a pore size of 0.22 μm, and washed repeatedly with deionized water until neutral, and then washed 5 times with tetrahydrofuran. After vacuum drying at 50° C. for 24 hours, 0.066 g of bromine-based carbon nanotubes were obtained.

[0023] Add 50 mL of absolute diethyl ether, 50 mg of bromine-based carbon nanotubes and 0.4 g of polished magnesium strips into a 100 mL three-neck round bottom flask equipped with a magnetic stirrer, heat ...

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Abstract

The invention relates to a preparation method of a functionalized carbon nano tube which can be used in reversible addition-fragmentation chain transfer free radical (RAFT) polymerization. The RAFT polymerization as a free radical living controllable polymerization is characterized in controllable structure and molecular weight of the product. The carbon nano-tube becomes a purified and dispersed carbon nano tube after treated by oleum; bromo carbon nano tube is obtained by the modification on the surface of the carbon nano tube with aromatic diazonium salt containing bromos. Grignard reagent is prepared by the bromo carbon nano tube, and has reaction with carbon disulfide and coupling reaction with organic bromide to produce chain transfer agent-dithioester which contains the carbon nano-tube and can be used as RAFT polymerization. The dithioester containing the carbon nano tube has a high chain transfer constant and a special structure, and can make the RAFT polymerization realize successfully the living controllable polymerization. The invention proves possibilities for controlling molecules design, structure and components of the carbon nano-tube-polymers material, thereby the invention has a wider application prospect.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a surface-modified carbon nanotube, in particular to a preparation method of a functionalized carbon nanotube that can be used as a RAFT (reversible addition-fragmentation chain transfer free radical) polymerized chain transfer agent. Background technique [0002] Carbon nanotubes have excellent intrinsic properties of graphite, such as a series of comprehensive properties such as heat resistance, corrosion resistance, good heat transfer and electrical conductivity, high temperature strength, self-lubrication and biocompatibility. Its most prominent features are: the fine structure formed at the nanoscale, the special electrical properties created by the nanostructure, and the ultra-high mechanical properties built by carbon bonds. [0003] Due to the superior properties of carbon nanotubes, the application prospects of carbon nanotubes are immeasurable. However, carbon nanotubes are inso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/38C08F292/00
Inventor 刘琳黄思浙王国建
Owner TONGJI UNIV