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Preparation method of perylenetetracarboxylic diimide modified polyimide polymer material

A technology of perylene tetracarboximide and perylene tetracarboximide is applied in the field of preparation of polyimide polymer materials, which can solve the problem of decreased energy storage density, increased conductivity loss, and inability to adapt to the working voltage environment and other problems, to achieve the effect of easy large-scale industrial production and uniform dielectric properties

Inactive Publication Date: 2021-03-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for this material to meet the application requirements under the operating temperature of 150ºC and high temperature and strong electric field above 400MV / m. sharp rise, leading to a sharp drop in energy storage density
Second, the breakdown field strength of polyimide is not high, so it cannot adapt to a higher working voltage environment

Method used

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  • Preparation method of perylenetetracarboxylic diimide modified polyimide polymer material
  • Preparation method of perylenetetracarboxylic diimide modified polyimide polymer material
  • Preparation method of perylenetetracarboxylic diimide modified polyimide polymer material

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Embodiment 1

[0034] In terms of suppressing the loss of conductance, especially in the case of high electric field, the density of local states in the polymer medium is very large, and the electrons injected into the polymer are bound in different local state energy levels. The conduction process is mainly due to the electron It is caused by migration between localized states, that is, electrons jump from one localized state to another by means of hopping conductance. After the introduction of perylenetetracarboximide small molecules, because of its strong electron affinity, deep traps can be formed inside the polymer material, such as figure 1 As shown, these deep traps can effectively hinder the migration process of electrons in the localized state, thereby suppressing the loss caused by the internal hopping conductance of the polymer medium under high temperature and high electric field.

Embodiment 2

[0036] The Schottky barrier curve of the contact interface between the metal electrode and the polymer medium is as follows: figure 2 shown. Electrons emitted from a point in the metal electrode will induce a corresponding positive charge in the electrode, and the electron will be affected by the image force generated by the electric field of the induced positive charge. The barrier height that electrons need to cross from the metal electrode to the polymer medium is the work function of the metal minus the electron affinity of the polymer medium. Under the action of an external electric field, electrons will overcome the image force and inject from the metal electrode into the polymer medium, and the action of the electric field reduces the height of the potential barrier that electron injection needs to overcome during this process. This patent uses semiconductor small molecules to build an electron adsorption layer at the electrode-polymer interface, and the electron adso...

Embodiment 3

[0038] In terms of improving the breakdown field strength, small molecules of perylenetetracarboximide can capture high-energy electrons, decompose themselves, be excited and ionized to form free radicals, and weaken the impact of electrons on polymer molecular chains under strong electric fields, thereby Increase the breakdown field strength of polymer materials. The Weber distribution of breakdown field strength of polyimide polymer materials modified by perylenetetracarboximide derivatives at 150ºC is as follows: Figure 7 As shown, its characteristic breakdown field strength is about 491 MV / m.

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Abstract

The invention relates to a preparation method of a perylenetetracarboxylic diimide modified polyimide polymer material. The perylenetetracarboxylic diimide modified polyimide polymer material is prepared from perylenetetracarboxylic diimide small molecules, polyimide and an N-methyl pyrrolidone solution, and the preparation steps comprise a mixing step, a drip coating step, a drying step and a stripping step which are carried out in sequence. The invention has the beneficial effects that the conductivity loss of the polymer material is reduced, the impact of electrons on a polymer molecular chain under a strong electric field is weakened, the breakdown field intensity of the polymer material is greatly improved, and large-scale industrial production is easy to realize.

Description

technical field [0001] The invention relates to the field of film capacitor preparation, in particular to a method for preparing a perylenetetracarboximide modified polyimide polymer material. Background technique [0002] Due to the advantages of ultra-high power density, extremely low loss and higher operating voltage, dielectric capacitors are not only important basic electronic components, but also play a major role in bypassing, decoupling, filtering and energy storage in circuits. At the same time, it is widely used in basic energy storage devices in electronic power systems, energy systems, and cutting-edge weapon systems. According to the dielectric materials used, dielectric capacitors can be mainly divided into three categories: organic polymer dielectric capacitors, inorganic dielectric capacitors, and electrolytic capacitors. Among them, organic film capacitors, which use organic polymers as dielectric materials, have the characteristics of light weight, good pr...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L79/08C08K5/3437
CPCC08J5/18C08J2379/08C08K5/3437
Inventor 李琦袁超何金良周垚成桑梁家杰胡军
Owner TSINGHUA UNIV
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