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A low filler content field-sensitive nonlinear conductive composite film and its preparation method

A composite material film and filler content technology, applied in the field of dielectric composite materials, can solve the problems of limited practical application, degradation of plasticity, toughness and other mechanical properties of composite materials, and achieve excellent nonlinear conductance characteristics, good nonlinear conductance characteristics, tensile The effect of enhanced elongation

Active Publication Date: 2021-11-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High filler content has a deteriorating effect on the plasticity, toughness and other mechanical properties of the composite material, which limits the practical application of this composite material

Method used

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  • A low filler content field-sensitive nonlinear conductive composite film and its preparation method
  • A low filler content field-sensitive nonlinear conductive composite film and its preparation method
  • A low filler content field-sensitive nonlinear conductive composite film and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] (1) Add 2% SiC nanowires (50 microns in length and 500 nanometers in diameter) to 30 ml of N,N-dimethylformamide relative to the volume fraction of the final composite material film, ultrasonically disperse for 0.5 hours, and then add 4.6g of 4,4'-diaminodiphenyl ether was stirred until completely dissolved, and then 7.55g of 3,3',4,4'-benzophenone tetracarboxylic dianhydride was added in batches to the solution. The solution was subjected to in-situ polymerization for 24 hours under nitrogen atmosphere and ice-water bath conditions to obtain a polyamic acid / SiC nanowire solution.

[0034] (2) Use a film maker to cast the above polyamic acid / SiC nanowire solution on a glass plate to form a film, and keep the film at 50°C, 100°C, 150°C, 200°C, 250°C and 300°C for one Hours to complete the solvent evaporation and thermal imidization process, after cooling, immerse the glass plate in distilled water, remove the film, wash it with distilled water and dry it to obtain a poly...

Embodiment 2

[0036] (1) Add 1% SiC nanowires (15 microns in length and 300 nanometers in diameter) to 30 ml of N,N-dimethylformamide relative to the volume fraction of the final composite material film, ultrasonically disperse for 0.5 hours, and then add Stir 5.78g of 4,4'-diaminodiphenyl ether until completely dissolved, and then add 6.37g of pyromellitic anhydride in batches to the solution. The solution was subjected to in-situ polymerization for 24 hours under nitrogen atmosphere and ice-water bath conditions to obtain a polyamic acid / SiC nanowire solution.

[0037] (2) Use a film maker to cast the above polyamic acid / SiC nanowire solution on a glass plate to form a film, and keep the film at 50°C, 100°C, 150°C, 200°C, 250°C and 300°C for one Hours to complete the solvent evaporation and thermal imidization process, after cooling, immerse the glass plate in distilled water, remove the film, wash it with distilled water and dry it to obtain a polyimide / SiC nanowire composite film.

[0...

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Abstract

The invention discloses a field-sensitive nonlinear conductive composite film with low filler content and a preparation method thereof. The invention uses SiC nanowires with high aspect ratio as fillers, and diamine and dianhydride as monomers to prepare SiC nanometer wires. wire / polyimide composite film, and the volume fraction of SiC nanowires in the composite is only 1%-3%. The method is simple in process and suitable for mass production, and the prepared low-filling ratio composite film has good nonlinear conductivity characteristics, and the conductivity can be adjusted spontaneously with the change of electric field intensity, and at the same time, the mechanical properties of the polyimide matrix are not deteriorated. It can be used as a deep dielectric charging protection material for spacecraft and other fields.

Description

technical field [0001] The invention relates to a field-sensitive nonlinear conductive composite material film with low filler content and a preparation method thereof, belonging to the field of dielectric composite materials. Background technique [0002] Spacecraft such as medium-orbit satellites working in the radiation belt are threatened by the ion radiation environment with high penetration energy. Due to the high insulation of the polymer dielectric, the instantaneous high-flux high-energy electron beam brought by ion radiation Charges are easy to accumulate in the polymer dielectric outside the spacecraft and further cause deep dielectric charging, forming a space electric field with high electric field strength, and finally causing electrostatic discharge, resulting in the occurrence of pulse currents. Pulse current and the resulting high-frequency electromagnetic waves will affect the normal operation of various instruments and equipment in the spacecraft. In extre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L79/08C08K7/00C08K3/34
CPCC08J5/18C08J2379/08C08K3/34C08K7/00C08K2201/003C08K2201/004C08K2201/011C08K2201/016
Inventor 李衡峰王浩源杨科孟凡威罗丽欧阳添资
Owner CENT SOUTH UNIV
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