Hydroxyl group functionalization carbon nanotube for polyurethane chain-expanding agent and method for preparing same

A technology of carbon nanotubes and polyurethane, applied in the field of materials, can solve the problems of destroying carbon nanotubes and affecting the performance of carbon nanotubes, and achieve the effects of improving dispersion, increasing interfacial bonding force, and improving mechanical properties

Inactive Publication Date: 2008-12-31
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the strong oxidation process of the acidification treatment will destroy the structure of the carbon nanotubes and cut off the carbon nanotubes, which will affect the performance of the carbon nanotubes themselves; Addition, anionic polymerization, free radical polymerization, electrochemical reduction, electron transfer method, etc. to realize the surface chemical modification of carbon nanotubes

Method used

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  • Hydroxyl group functionalization carbon nanotube for polyurethane chain-expanding agent and method for preparing same
  • Hydroxyl group functionalization carbon nanotube for polyurethane chain-expanding agent and method for preparing same
  • Hydroxyl group functionalization carbon nanotube for polyurethane chain-expanding agent and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Polyethylene glycol (molecular weight 2000) PEG-2000 modified multi-walled carbon nanotubes to prepare hydroxyl functionalized multi-walled carbon nanotubes

[0029] (a) Add 40ml of 98% nitric acid, 40ml of 96% sulfuric acid and 120ml of dichloromethane into the three-necked flask successively, stir and cool to 0-5°C. 30 ml of dichloromethane dissolved in 50 g of polyethylene glycol 2000 was slowly added dropwise. The temperature is maintained at 5-8°C. After the dropwise addition, the reaction was continued for 1 h. After the reaction, the reaction mixture was poured into ice water, the dichloromethane layer was separated, and washed continuously with water and 50 wt% aqueous sodium bicarbonate until neutral. After removing the solvent, polyethylene glycol 2000 with one end terminated by a nitrate group was obtained.

[0030] (b) Put 10mmol of polyethylene glycol 2000 capped with nitrate group, 21mmol of sodium azide, and 15ml of distilled water in a three...

Embodiment 2

[0032] Example 2: Preparation of hydroxyl-functionalized single-walled carbon nanotubes by modifying single-walled carbon nanotubes with polytetrahydrofuran diol (molecular weight: 2000)

[0033](a) Add 40ml of 98% nitric acid, 40ml of 96% sulfuric acid and 120ml of dichloromethane into the three-necked flask successively, stir and cool to 0-5°C. 30 ml of dichloromethane dissolved in 50 g of polytetrahydrofuran diol 2000 was slowly added dropwise. The temperature is maintained at 5-8°C. After the dropwise addition, the reaction was continued for 1 h. After the reaction, the reaction mixture was poured into ice water, the dichloromethane layer was separated, and washed continuously with water and 50 wt% aqueous sodium bicarbonate until neutral. After removing the solvent, polytetrahydrofuran diol whose end is terminated by a nitrate group is obtained.

[0034] (b) Put 10mmol of polytetrahydrofuran diol terminated by nitrate ester groups, 21mmol of sodium azide, and 15ml of di...

Embodiment 3

[0036] Example 3: Pentaerythritol modified multi-walled carbon nanotubes to prepare hydroxyl-functionalized multi-walled carbon nanotubes

[0037] (a) Add 40ml of 98% nitric acid, 40ml of 96% sulfuric acid and 120ml of dichloromethane into the three-necked flask successively, stir and cool to 0-5°C. 30ml of dichloromethane dissolved in 4g of pentaerythritol was slowly added dropwise. The temperature is maintained at 5-8°C. After the dropwise addition, the reaction was continued for 1 h. After the reaction, the reaction mixture was poured into ice water, the dichloromethane layer was separated, and washed continuously with water and 50 wt% aqueous sodium bicarbonate until neutral. After removal of the solvent, pentaerythritol with one end capped by a nitrate group is obtained.

[0038] (b) Put 10mmol of pentaerythritol capped with a nitrate group at one end, 21mmol of sodium azide, and 15ml of distilled water in a three-necked flask, heat to 90°C while stirring, react for 24h...

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Abstract

The invention discloses a hydroxyl-functionalized carbon nanotube used for polyurethane chain extender and a preparation method thereof. Firstly, a compound or a polymer, the terminal group of which is multi-hydroxyl, is used for synthesizing a compound or a polymer, the terminal group of which is provided with a nitrate ester group; and then the nitrate ester group is transformed into an azide group to obtain a compound or a polymer, the terminal of which is sealed by the azide group and the hydroxyl group simultaneously. Through the addition reaction between the azide group and a ring on the surface of the carbon nanotube, the compound or the polymer with the hydroxyl group is connected with the surface of the carbon nanotube by covalent bonds to realize the preparation of the hydroxyl-functionalized carbon nanotube. The surface of the hydroxyl-functionalized carbon nanotube prepared by the invention is connected with one hydroxyl or a plurality of hydroxyls; therefore, when being applied to the synthesis of polyurethane, the hydroxyl-functionalized carbon nanotube can function as polyurethane chain extender, the interface combining power between functionalized carbon nanotube and polyurethane matrix can be improved greatly, meanwhile, the existence of hydroxyl groups can well improve the dispersivity of the carbon nanotube in the polyurethane matrix.

Description

technical field [0001] The invention belongs to the field of materials, and relates to a hydroxyl-functionalized carbon nanotube that can be used as a polyurethane chain extender and a preparation method thereof. Background technique [0002] Carbon nanotubes not only have unique properties such as very high strength, excellent electromagnetic properties and thermal stability, but also have similar structures to polymer materials. Therefore, it is of great research and application value to improve the performance of polymers by compounding with carbon nanotubes. [0003] Polyurethane materials have high elasticity, good flexibility, high Young's modulus and excellent wear resistance, good weather resistance, oil resistance, grease resistance and many solvent resistance. In addition, the products have various shapes and molding processes. It is simple and convenient, so it is widely used in various industries. However, its strength is not high, and its heat resistance, wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02B82B3/00
Inventor 王国建董玥刘跃东赵彩霞刘琳许乾慰
Owner TONGJI UNIV
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