Method for in-situ polymerization preparation of hyperbranched polyamide grafted carbon nanotubes

A technology of hyperbranched polyamide and carbon nanotubes, which is applied in the field of surface modification of carbon nanotubes, can solve the problems that carbon nanotubes are difficult to disperse and dissolve, difficult to uniformly disperse, thermodynamically unstable, etc., so as to improve performance and improve dispersion. The effect of sex, high grafting rate

Inactive Publication Date: 2017-03-08
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

Due to the large π bond on the surface of carbon nanotubes, the surface is neither hydrophilic nor lipophilic, which makes it difficult for carbon nanotubes to disperse and dissolve in various solvents
Nanotubes have a high specific surface area and surface free energy, and are in a thermodynamically unstable state, easily condensed into clusters, and difficult to disperse uniformly

Method used

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  • Method for in-situ polymerization preparation of hyperbranched polyamide grafted carbon nanotubes
  • Method for in-situ polymerization preparation of hyperbranched polyamide grafted carbon nanotubes

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Using multi-walled carbon nanotubes prepared by catalytic pyrolysis as raw materials, after acidification, in the presence of triphenyl phosphite and pyridine, polymerized with tris(3-aminophenyl)phosphine oxide and adipic acid, the obtained In situ modification of carbon nanotubes by hyperbranched polyamides.

[0027] (1) Weigh 2g of carbon nanotubes, mix concentrated sulfuric acid and concentrated nitric acid at a ratio of 3:1 by volume, add 240ml of mixed acid, ultrasonicate at 40kHz for 0.5h, then stir strongly for 0.5h, heat up to 60°C, continue Stir for 4 hours, filter with a microporous membrane after the reaction is completed, wash with distilled water repeatedly until neutral, and vacuum dry at 120°C for 12 hours to obtain carboxylated carbon nanotubes;

[0028] (2) Weigh 27.8% of triphenylphosphine oxide in a flask, add 100ml of concentrated sulfuric acid, stir to dissolve, mix 60ml of concentrated sulfuric acid and 16ml of fuming nitric acid, then add the mix...

Embodiment 2

[0034] Using multi-walled carbon nanotubes prepared by catalytic pyrolysis as raw materials, after acidification, in the presence of triphenyl phosphite and pyridine, polymerized with tris(3-aminophenyl)phosphine oxide and adipic acid, the obtained In situ modification of carbon nanotubes by hyperbranched polyamides.

[0035] Steps (1), (2), and (3) are the same as in Example 1, and the addition of acidified carbon nanotubes in step (4) is changed to 10% of the total mass of three (3-aminophenyl) phosphine oxide and adipic acid , other technological processes remain unchanged, the target product is obtained, thermal analysis shows that the grafting rate of hyperbranched polyamide is 31%.

Embodiment 3

[0037] Using multi-walled carbon nanotubes prepared by catalytic pyrolysis as raw materials, after acidification, in the presence of triphenyl phosphite and pyridine, polymerized with tris(3-aminophenyl)phosphine oxide and adipic acid, the obtained In situ modification of carbon nanotubes by hyperbranched polyamides.

[0038] Steps (1), (2), and (3) are the same as in Example 1, and the addition of acidified carbon nanotubes in step (4) is changed to 5% of the total mass of three (3-aminophenyl) phosphine oxide and adipic acid , other technical processes remain unchanged, the target product is obtained, thermal analysis shows that the grafting rate of hyperbranched polyamide is 29%.

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Abstract

The invention relates to a method for an in-situ polymerization preparation of hyperbranched polyamide grafted carbon nanotubes; with tri(3-aminophenyl)phosphorus oxide and diacid as monomers, hyperbranched polyamide is grafted to the surface of carbon nanotubes by in situ polymerization. The prepared hyperbranched polyamide in-situ modified carbon nanotubes have higher grafting rate and better dispersibility than those of hyperbranched polyamide modified carbon nanotubes prepared by a direct grafting method.

Description

technical field [0001] The invention belongs to the field of surface modification of carbon nanotubes, relates to hyperbranched polymer modified carbon nanotubes, in particular to a method for preparing hyperbranched polyamide grafted carbon nanotubes by in-situ polymerization. Background technique [0002] In 1991, Iijima discovered carbon nanotubes (CNTs), which is the successor to C 60 A major discovery in the field of carbon materials. Due to the huge aspect ratio, carbon nanotubes exhibit typical one-dimensional quantum characteristics and have many unusual mechanical, electromagnetic and chemical properties. Theoretically speaking, carbon nanotubes are the most ideal reinforcing fillers for the preparation of polymer composites, and their excellent mechanical properties can greatly improve the mechanical strength and toughness of polymer composites. Properties such as performance, thermal properties, magnetic properties, and molecular effects can in turn endow polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K9/10C08K9/02C08K7/24C08L77/00C08G69/42C08G83/00
CPCC08K9/10C08G69/42C08G83/005C08K7/24C08K9/02C08K2201/011C08L77/00
Inventor 陈晓婷冯传义李道克冀茹鑫张雅婷
Owner TIANJIN UNIV OF SCI & TECH
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