A method for preparing high dielectric thin films based on in-situ polymerization of modified barium titanate nanowires

An in-situ polymerization and barium titanate technology, applied in the field of dielectric materials, can solve the problems of reduced breakdown strength of composite films and uneven electric field distribution of composite materials, achieve high charge-discharge efficiency, improve interface compatibility, Effect of improving stability and dielectric properties

Active Publication Date: 2022-02-08
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If the ceramic material with high dielectric constant is directly added to the polymer, due to the large electrical mismatch, the electric field distribution of the entire composite material will be uneven, and the breakdown strength of the composite film will be greatly reduced.

Method used

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  • A method for preparing high dielectric thin films based on in-situ polymerization of modified barium titanate nanowires
  • A method for preparing high dielectric thin films based on in-situ polymerization of modified barium titanate nanowires
  • A method for preparing high dielectric thin films based on in-situ polymerization of modified barium titanate nanowires

Examples

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Embodiment 1

[0044] The method for preparing a high-dielectric film based on in-situ polymerization of modified barium titanate nanowires described in Example 1 comprises the following steps:

[0045] (1) Barium titanate nanowires were prepared by a two-step hydrothermal method; 3 g of titanium dioxide powder was added to a sodium hydroxide solution with a concentration of 10 mol / L, mixed and stirred for 72 hours, and the stirred product was ultrasonically cleaned with deionized water and ethanol in sequence , remove the sodium hydroxide on its surface, and freeze-dry the stirred product after cleaning for 12 hours to obtain the primary product; weigh 0.6 g of the primary product and add it to a 0.1mol / L octahydrate barium hydroxide solution. Under the conditions, stirring and reacting for 25 hours, and using deionized water and ethanol to ultrasonically clean the stirred product in sequence, when the cleaning solution of deionized water is neutral, the cleaning is completed, and the cleane...

Embodiment 2

[0050] The preparation method of in-situ polymerized high dielectric film based on modified barium titanate nanowires described in Example 2 comprises the following steps:

[0051] (1) Barium titanate nanowires were prepared by a two-step hydrothermal method; 3 g of titanium dioxide powder was added to a sodium hydroxide solution with a concentration of 10 mol / L, mixed and stirred for 72 hours, and the stirred product was ultrasonically cleaned with deionized water and ethanol in sequence , remove the sodium hydroxide on its surface, and freeze-dry the stirred product after cleaning for 11 hours to obtain the primary product; weigh 0.6 g of the primary product and add it to a barium hydroxide octahydrate solution with a concentration of 0.1 mol / L. Stirring and reacting for 24 hours under the same conditions, and using deionized water and ethanol to ultrasonically clean the stirred product in sequence, and when the cleaning solution of deionized water is neutral, the cleaning is...

Embodiment 3

[0056] The preparation method of in-situ polymerized high dielectric film based on modified barium titanate nanowires described in Example 3 comprises the following steps:

[0057] (1) Prepare barium titanate nanowires by a two-step hydrothermal method; add 3 g of titanium dioxide powder into a sodium hydroxide solution with a concentration of 10 mol / L, mix and stir for 72 hours, and use deionized water and ethanol to clean and ultrasonically wash and stir product, remove the sodium hydroxide on its surface, and freeze-dry the stirred product after cleaning for 12 hours to obtain the primary product; weigh 0.6 g of the primary product and add it to a 0.1mol / L octahydrate barium hydroxide solution at 95°C Under the condition of stirring and reacting for 24 hours, the stirring product was cleaned with deionized water and ethanol in sequence, and the cleaning was completed when the cleaning solution of deionized water was neutral, and the stirred product after cleaning was freeze-...

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Abstract

The application provides a method for preparing a high dielectric film based on in-situ polymerization of modified barium titanate nanowires, comprising the following steps: preparing barium titanate nanowires by a two-step hydrothermal method; Barium titanate nanowires for surface modification; in an inert environment, add the modified barium titanate nanowires and isothiocyanate into N-methylpyrrolidone solution and stir for nucleophilic addition reaction, and add 4,4'-diaminodiphenylmethane was subjected to in-situ polymerization reaction, the polymerization product was dropped into methanol for purification, and dried to obtain an intermediate product; the intermediate product was dissolved in N-methylpyrrolidone solution, mixed and stirred evenly, and The mixed solution is cast on the substrate to form a film, and the film is dried to obtain the film; the beneficial effect of the present invention is that the film obtained by the preparation method of the present invention can still maintain a relatively high charge-discharge efficiency under a high electric field, effectively improving the high Stability and dielectric properties of dielectric films.

Description

technical field [0001] The present application relates to the technical field of dielectric materials, in particular to a method for preparing high-dielectric films based on in-situ polymerization of modified barium titanate nanowires. Background technique [0002] With the development of the country's digital society, future film capacitors are also developing in the direction of higher power. Film capacitors have the advantages of high insulation resistance, wide frequency response, and small dielectric loss. They have been used in mobile phones, computers, home appliances, and audio. At present, the dielectric film material for film capacitors in my country is mainly polypropylene. [0003] As an amorphous glass phase polymer, ArPTU is reported to have a dipole moment of 4.89 Debye, which makes polythiourea have a higher dielectric constant than most traditional linear polymer dielectrics, about 4.5. The large dipole moment of the thiourea functional group provides stron...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L87/00C08G83/00
CPCC08J5/18C08G83/001C08J2387/00
Inventor 杨亚杰李霞丽杨雨萌郭继民孙松徐建华涂丹石柳蔚周榆久
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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