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
CN111995780BActive Publication Date: 2022-02-08UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF ELECTRONICS SCI & TECH OF CHINA
Publication Date
2022-02-08

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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.
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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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