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Method for preparing in-situ polycondensation enhanced carbon nanotube/nylon composite materials

A technology of nylon composite materials and carbon nanotubes, which is applied in the field of preparation of polymer composite materials, can solve problems such as poor stability and electrical properties, insufficient modulus and strength, poor rigidity and heat resistance, etc., to achieve Effects of improved tensile strength, strong mechanical properties, and excellent performance

Inactive Publication Date: 2005-06-29
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the presence of more polar groups, its water absorption rate is high, its heat distortion temperature is low, and its modulus and strength are not high enough.
When used under strong external force and heating conditions, the rigidity and heat resistance are not good, which will deteriorate the stability and electrical properties of the product and limit its application in many fields, so it must be modified to improve its performance.
People have used various methods to enhance and modify nylon, which has improved its performance to a certain extent, but the effect is not very satisfactory.

Method used

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  • Method for preparing in-situ polycondensation enhanced carbon nanotube/nylon composite materials

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of carbon nanotube / nylon 1010 composite material containing 1wt% carbon nanotube in situ polycondensation

[0022] (1) Using the single-walled carbon nanotubes prepared by catalytic pyrolysis as a raw material, add 0.7g of dry carbon nanotubes and 20ml of potassium permanganate-containing In sulfuric acid, where the concentration of sulfuric acid is 98wt%, the concentration of potassium permanganate in sulfuric acid is 5g / 100ml, heat up to 120°C after 30min with 40kHz ultrasonic treatment, stir and react under reflux for 24hr, use φ0.22μm polytetrafluoroethylene Suction filtration with a microporous membrane, repeated washing with deionized water to neutrality, and vacuum drying at 80°C for 24 hours to obtain 0.26 g of acidified carbon nanotubes;

[0023] (2) In a 100ml three-necked round bottom flask equipped with a mechanical stirrer, add 25g of nylon 1010 salt, then evacuate and fill with high-purity nitrogen. This process is repeated three tim...

Embodiment 2

[0024] Embodiment 2: Preparation of carbon nanotube / nylon 1010 composite material containing 2.5wt% carbon nanotube in situ polycondensation

[0025] (1) Using single-walled carbon nanotubes prepared by catalytic pyrolysis as raw material, add 1.75g ​​of dry carbon nanotubes and 30mL of potassium permanganate-containing In sulfuric acid, the concentration of sulfuric acid is 98wt%, and the concentration of potassium permanganate in sulfuric acid is 4g / 100ml. After 50kHz ultrasonic treatment for 40min, heat to 120°C, stir and reflux for 48hr, and use φ0.22μm polytetrafluoroethylene Suction filtration with a microporous membrane, repeated washing with deionized water to neutrality, and vacuum drying at 80°C for 24 hours to obtain 0.64 g of acidified carbon nanotubes;

[0026] (2) In a 100ml three-necked round bottom flask equipped with a mechanical stirrer, add 25g of nylon 1010 salt, then evacuate and fill with high-purity nitrogen. This process is repeated three times to remov...

Embodiment 3

[0027] Example 3: Preparation of carbon nanotube / nylon 1010 composite material containing 5wt% carbon nanotube in situ polycondensation

[0028] (1) Using the multi-walled carbon nanotubes prepared by catalytic pyrolysis as a raw material, add 3.5g of dry carbon nanotubes and a mixed solution of 30ml of nitric acid and sulfuric acid in a 100ml single-neck round bottom flask equipped with a magnetic stirring rotor In, wherein the concentration of nitric acid is 60wt%, the concentration of sulfuric acid is 98wt%, the proportioning ratio of sulfuric acid and nitric acid is 1: 1ml / ml, heat up to 150 ℃ after 60min with 20kHz ultrasonic treatment, stir and react under reflux for 96hr, use φ0 .22 μm polytetrafluoroethylene microporous membrane filter, washed repeatedly with deionized water until neutral, vacuum dried at 80°C for 24 hours to obtain 1.4 g of acidified carbon nanotubes;

[0029] (2) In a 100ml three-necked round bottom flask equipped with a mechanical stirrer, add 25g o...

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Abstract

Disclosed is a method to prepare polycondensation strengthened carbon nm pipe nylon compound material. Firstly, do acid procession to the carbon nm pipe, which is then to have polycondensation reaction with nylon monomer or salt of nylon monomer. The acidified carbon nm pipe has outstanding performance, and through the polycondensation way, compared with other nm material such as polynite or other compounding method like common mixing method, it has better mechanical property ; the polycondensation reaction can realize average distribution of carbon nm pipe as well as keeping its nm characteristics; by once synthesis to form, avoids degradation caused by heat procession and keeps stability of other performances, and its preparing method is simple.

Description

Technical field: [0001] The invention relates to a method for preparing a polymer composite material, in particular to a method for preparing a carbon nanotube / nylon composite material reinforced by in-situ polycondensation. Background technique: [0002] Nylon has good physical and mechanical properties, high tensile strength, excellent wear resistance, good self-lubrication, good impact toughness, outstanding chemical and oil resistance, and is a widely used engineering plastic. However, due to the presence of more polar groups, its water absorption rate is high, its heat distortion temperature is low, and its modulus and strength are not high enough. When used under strong external force and heating conditions, the rigidity and heat resistance are not good, which will deteriorate the stability and electrical properties of the product and limit its application in many fields, so it must be modified to improve its performance. . People have used various methods to enhance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/08C08G69/16C08K3/04C08L77/00
Inventor 曾海林高超颜德岳
Owner SHANGHAI JIAO TONG UNIV
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