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Preparation method of bismaleimide block polymer containing carbon nanotubes

A technology of bismaleimide block and bismaleimide is applied in the field of preparation of bismaleimide block polymer, which can solve the problems of limiting the application of carbon nanotubes, easy agglomeration and the like, and achieves Easy to cure, high bond strength, good toughness

Inactive Publication Date: 2010-05-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the extremely high surface energy of CNTs, the huge van der Waals force between the tubes makes them easy to agglomerate, and they are almost insoluble in any solvent, so it is difficult to disperse in the composite matrix, which limits the application of carbon nanotubes.

Method used

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  • Preparation method of bismaleimide block polymer containing carbon nanotubes
  • Preparation method of bismaleimide block polymer containing carbon nanotubes

Examples

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Embodiment l

[0025] Example 1: Multi-walled carbon nanotubes (OD<8nm) prepared by the arc discharge method were used as the initial raw material, after purification, acidification, acyl chloride, and amination, and then combined with 4,4'-bismaleimide Diphenylmethane (BDM) undergoes Michael addition reaction to obtain a 4,4'-bismaleimidodiphenylmethane block polymer containing multi-walled carbon nanotubes.

[0026] Step (1): In the 200ml single-necked round-bottomed flask equipped with agitator, add 6g of dry multi-walled carbon nanotube raw material and 100mL, 20% weight concentration nitric acid solution, process 100 hours under 1kHz ultrasonic wave, then Heat to 100°C, react for 1 hour, filter with Ψ0.8μm polytetrafluoroethylene microfiltration membrane, wash with deionized water 2-8 times until neutral, and vacuum dry at 20°C for 48 hours to obtain purified carbon nano Tube;

[0027] Step (2): In the 200mL single-necked round bottom flask that stirrer has been housed, add the carbon ...

Embodiment 2

[0032] Example 2: The single-walled carbon nanotubes (OD<8nm) prepared by chemical vapor deposition were used as the initial raw material, after purification, acidification, acyl chloride, and amination, and N-methylphthalimide The Michael addition reaction is carried out to obtain the N-methylphthalimide block polymer containing single-walled carbon nanotubes.

[0033] Step (1): In the 500ml single-necked round bottom flask that magnetic stirring rotor has been housed, add 6g single-walled carbon nanotube raw material and 200mL, the sulfuric acid of 30% weight concentration, use 60kHz ultrasonic treatment for 18 hours, then heat to 70 ℃, reacted for 12 hours, filtered with Ψ0.8μm polyvinylidene fluoride microfiltration membrane, washed repeatedly with deionized water until neutral, and vacuum dried at 100℃ for 24 hours to obtain purified carbon nanotubes;

[0034] Step (2): In the 250mL single-necked round-bottomed flask equipped with a magnetic stirring rotor, add the purifi...

Embodiment 3

[0040] Example 3: The single-walled carbon nanotubes (OD<8nm) prepared by the laser evaporation method are used as the initial raw material, after purification, acidification, acyl chloride, and amination, Michael Addition reaction, the diphenyl ether-based bismaleimide block polymer containing carbon nanotubes is obtained.

[0041] Step (1): In a 500ml single-neck round bottom flask equipped with mechanical stirring, add 6g of single-walled carbon nanotube raw material and 300mL of 50% weight concentration sulfuric acid solution, use 100kHz ultrasonic treatment for 1 hour, then heat and Stir and reflux, react for 100 hours, filter with ψ0.8μm polytetrafluoroethylene microfiltration membrane, wash repeatedly with deionized water 2-8 times until neutral, and dry in vacuum at 200°C for 1 hour to obtain purified single-walled carbon nanotube;

[0042] Step (2): In a 500mL single-neck round bottom flask equipped with a magnetic stirring rotor, add 5g of purified carbon nanotube r...

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Abstract

The invention belongs to the technical field of nanomaterials, and in particular relates to a preparation method of a bismaleimide block polymer containing carbon nanotubes. The method of the invention comprises the following steps: after surface quantitative carboxylation and acyl chlorination of purified carbon nanotubes, introducing long-chain diamine or polyamine with characteristic structures into the carbon nanotubes; after the whole carbon nanotubes are changed into the diamine or the polyamine, regarding the aminated carbon nanotubes as high polymer chains; and then, carrying out Michael addition reaction on the aminated carbon nanotubes and bismaleimide to generate a bismaleimide resin linear block polymer containing carbon nanotubes, so that the carbon nanotubes become part of the bismaleimide resin system. The carbon nanotube modified bismaleimide resin can fully use the strength and the toughness of the carbon nanotubes to strengthen and toughen the bismaleimide and also increase the heat resistance and wear resistance of the bismaleimide, thereby providing a foundation for the application of bismaleimide resin in the fields of high-performance composite materials in space flight, aviation and the like.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to a preparation method of a bismaleimide block polymer containing carbon nanotubes. Background technique [0002] Bismaleimide (BMI) is a bifunctional compound with maleimide (MI) as the active terminal group. Bismaleimide resin (BMI) is known for its excellent heat and humidity resistance, low moisture absorption, radiation resistance, flame retardancy, excellent mechanical properties and dimensional stability, good electrical insulation, easy molding and processing, molecular structure Easy to design and other features, it is widely used in aerospace, machinery and electronics and other industrial fields. However, the cured and crosslinked bismaleimide has insufficient toughness and high brittleness, which limits its application range. Therefore, it needs to be modified in application. In recent years, the modification of bismaleimide (BMI) by researche...

Claims

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Application Information

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IPC IPC(8): C08G83/00
Inventor 邱军王宗明
Owner TONGJI UNIV
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