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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 the problems of poor stability and electrical properties, poor rigidity and heat resistance, insufficient modulus and strength, etc. Effects of increased tensile strength, excellent performance, and strong mechanical properties

Inactive Publication Date: 2006-06-14
SHANGHAI JIAOTONG 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

The invention discloses a preparation method of a carbon nanotube / nylon composite material strengthened by in-situ polycondensation. Firstly, the carbon nanotubes are acid-treated, and then the acidified carbon nanotubes are subjected to in-situ polycondensation reaction with nylon monomer or nylon monomer salt. Acidified carbon nanotubes have excellent properties, and exhibit better mechanical properties than other nanomaterials, such as montmorillonite, or other composite methods, such as blending methods, with nylon through in-situ polycondensation; in-situ polycondensation reaction, the uniform dispersion of carbon nanotubes can be realized, and the nano-characteristics of carbon nanotubes can be maintained; through one-time polymerization and molding, degradation due to thermal processing can be avoided, other properties can be kept stable, and the preparation 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 Patents(China)
IPC IPC(8): C08L77/00C08K3/04C08G69/08C08G69/16
Inventor 曾海林高超颜德岳
Owner SHANGHAI JIAOTONG UNIV
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