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Dielectric elastomers have potential as materials for artificial muscle actuators due to their excellent properties such as contractility. To understand the breakdown mechanism, breakdown tests of dielectric elastomers are performed under various experimental conditions. For a given temperature, the breakdown strength with a larger lamination number is less than that with a smaller lamination number...
To develop an electrode configuration without a semiconducting electrode for space charge measurements, a hemispherical steel electrode with a rough surface was used as the upper electrode in the pulsed electroacoustic (PEA) method to obtain acoustic matching with the sample. The space charge distributions of a polymer film were measured using various electrode configurations. As a semiconducting...
The power module for the electrical vehicle needs electrical insulation material with high thermal conductivity. In this paper, we investigated the compatibility between dielectric breakdown strength and thermal conduction in epoxy/boron-nitride composite, in comparison with epoxy/alumina composite. The breakdown test was carried out under the application of dc lamp voltage and impulse voltage at...
New concept of paper-based devices (we call “paper analysis chip”) and ink-jet printer-like analyzer for clinical diagnostics was presented. An original paper material of the chips (we call it “functional paper”) was made by a newly developed paper-making process with adding SAP (super absorbent polymer). The quite a new liquid handling mechanism with an active injection port by accumulation of the...
To understand the breakdown mechanism of extremely thin Polyethylene Naphthalate (PEN) film, the conduction current and the breakdown strength (Fb) were measured using the modified method. In addition, the surface temperature and the conduction current up to the breakdown were observed. The aluminum (Al) sheets were placed between the brass electrode and the evaporated electrode on extremely this...
We have been studying the breakdown characteristic of air-polymer composite insulation due to partial discharge (PD) under repetitive pulse voltage application using needle-plane electrode system. The purpose of this study is to clarify the effect of varied humidity on threshold frequency at the breakdown air polymer composite insulation caused by partial discharge in air gap. The result showed that...
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