Dielectric properties of epoxy/alumina nanocomposite influenced by control of micrometric agglomerates

Introduction of metal oxide nanoparticles to polymer material is known to have unique dielectric behavior and significant advantages in electrical insulation performance in power apparatus. This paper presents an attempt to clarify the influence of dispersibility of nanoparticles, especially focusin...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2010-06, Vol.17 (3), p.662-670
Main Authors: Kurimoto, Muneaki, Okubo, Hitoshi, Kato, Katsumi, Hanai, Masahiro, Hoshina, Yoshikazu, Takei, Masafumi, Hayakawa, Naoki
Format: Article
Language:English
Subjects:
agglomerate
Agglomerates
Alumina
alumina nanoparticle
Aluminum oxide
Centrifugal force
Dielectric losses
Dielectric materials
Dielectric properties
Dielectrics and electrical insulation
Epoxy nanocomposite
Epoxy resins
Fabrication
Force control
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
particle dispersibility
Permittivity
Plastic insulation
Polymers
Sensors
tan δ
Ultrasonic technology
ultrasonic wave
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Summary:Introduction of metal oxide nanoparticles to polymer material is known to have unique dielectric behavior and significant advantages in electrical insulation performance in power apparatus. This paper presents an attempt to clarify the influence of dispersibility of nanoparticles, especially focusing on agglomerates, on dielectric properties of a nanocomposite system by changing particle dispersion processes. Experiments were carried out in epoxy/alumina nanocomposites with the particle dispersion techniques by applying ultrasonic wave and centrifugal force. For the dispersibility control of nanoparticles, we changed the duration of ultrasonic wave and centrifugal force. The experimental results clarified the effect of centrifugal force on the separation of agglomerates and the effect of ultrasonic wave on the disruption of agglomerates. Next, we examined the dielectric properties such as relative permittivity and tan δ of the nanocomposites. As the result, we verified that the permittivity of epoxy/alumina nanocomposites became low due to separation and disruption effects of the agglomerates.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2010.5492236