Corona Resistance Mechanism of Nano-Modified Polyimide

Chen, Hao; Li, Lin; Zhao, Wei; Zhang, Xiaorui; Weng, Ling

doi:10.3390/polym14245469

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…Cool naturally, soak in distilled water to remove the lm. Scheme 1 Preparation process of PI/TNTs ("......" indicates hydrogen bonding) 3…”

Section: Preparation Of Titanate Nanotubesmentioning

confidence: 99%

“…At present, adding a certain amount of inorganic nanoparticles such as TiO 2 , Al 2 O 3 , SiO 2 , etc. to high-heat insulating materials (matrix) is the best and effective way to enhance corona resistance [3]. To further achieve enhanced electrical properties, nano llers and nanostructures in polyimide-based composites have proven to be an effective strategy [4].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of titanate nanotube-dispersed polyimide dielectric composites

Chen

Zhang

Xie

et al. 2023

Preprint

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In order to find a better performance polyimide-based composite, titanate nanotubes (TNTs）were prepared by hydrothermal method. TNTs were incorporated into polyimides, and PI/TNTs composite films were prepared by in situ sol-gel method. FTIR, SEM and XRD are used for the characterization of microstructure and morphology of polyimide-based composite films. TG tested the thermal stability of the material, and the results showed that the thermal stability of the film doped with TNTs in PI was significantly enhanced, and the thermal stability performance of the composite film was better with the increase of TNTs. Through dynamic mechanical analysis, it is shown that the storage modulus of the material increases with the increase of its enhanced phase content, and the storage modulus gradually decreases with the increase of temperature when the doping amount is certain and the temperature increases. The composite film has strong absorption of 365.0nm ultraviolet light, and the ultraviolet light of this wavelength has the greatest effect on the increase of the dielectric constant of PI/TNTs, and the results show that the PI/TNTs composite film has certain ultraviolet responsiveness. This paper provides a new method for the development of polyimide-based composites with excellent mechanical properties at high temperature.

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“…Cool naturally, soak in distilled water to remove the lm. Scheme 1 Preparation process of PI/TNTs ("......" indicates hydrogen bonding) 3…”

Section: Preparation Of Titanate Nanotubesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and properties of titanate nanotube-dispersed polyimide dielectric composites

Chen

Zhang

Xie

et al. 2023

Preprint

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“…Polyimide (PI) films are widely used in various types of electrical equipment insulation systems, such as drive motors for new energy vehicles, because they contain rigid structures, such as imide rings and aromatic rings, which make them resistant to high and low temperatures, ultraviolet radiation, chemical solvents, and high insulation [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Corona discharge is a localized self-sustained discharge of a gaseous medium in an inhomogeneous electric field, and is an early stage in the development of the breakdown process of the medium in an inhomogeneous electric field.…”

Section: Introductionmentioning

confidence: 99%

Study of the Dielectric and Corona Resistance Properties of PI Films Modified with Fluorene Moiety/Aluminum Sec-Butoxide

Zhang,

Liu,

Tang

et al. 2024

Polymers

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With the policy tilt and increased investment in research and development in the world, new energy vehicle technology continues to progress and the drive motor power density continues to improve, which puts forward higher requirements for the comprehensive performance of the core insulating material enameled wire enamel for drive motors. Polyimide (PI) has excellent electrical insulation properties, and heat resistance is often used to drive the motor winding insulation. To further improve the corona resistance and insulating properties of PI wire enamel varnish, in this paper, firstly, fluorene groups with a rigid conjugated structure were introduced into the molecular chain of the PI film by molecular structure modulation, and then uniformly dispersed alumina nanoclusters (AOCs) were introduced into the PI matrix by using an in situ growth process to inhibit the migration of high-energy electrons. The quantum size effect of the alumina nanoclusters was exploited to synergistically enhance the suppression and scattering of energetic moving electrons by PI-based composite films. The results show that the breakdown field strength of the PI-based composite film (MPI/1.0 vol% AOC) reaches 672.2 kV/mm, and the corona resistance life reaches 7.9 min, which are, respectively, 1.55 and 2.19 times higher than those of the initial PI film. A PI-based composite film with excellent insulating and corona resistance properties was obtained.

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