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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...
The breakdown strength, conduction current, and space charge distribution were measured to understand the electrical characteristics of polyvinylidene fluoride (PVDF) / barium titanium (IV) oxide (BTO) nanocomposites under DC voltage applications. The breakdown strength of PVDF with a BTO nanofiller was almost same regardless of a BTO content but the breakdown strength of PVDF with a BTO nanofiller...
In this paper, the simultaneous measurement of the space charge and conduction current were performed under constant DC field or increasing a dc ramp field to comprehend the breakdown phenomena of LDPE/MgO nanocmoposite. In the measurement under a dc constant field, the conduction current on LDPE increased clearly due to the positive charge injection by enhanced local field at the anode with negative...
To understand the space charge formation of low-density polyethylene (LDPE)/nano-sized magnesium oxide (MgO) nanocomposite materials, the breakdown strength and the space charge formation influenced by DC prestress were investigated. DC breakdown strength (Fb) of LDPE decreased with increase of DC prestress. A packet-like charge was observed under DC pre-stress. When the applied field turned to a...
To understand the space charge formation of low-density polyethylene (LDPE) / nano-sized magnesium oxide (MgO) nanocomposite materials, the space charge and the conduction current were simultaneously measured up to the breakdown under increasing DC ramp field. A negative charge was dominated in the sample without nanofiller (0 phr sample). A positive charge was dominated in nanocomoposite sample....
To understand the space charge formation of nano-sized magnesium oxide (MgO)/low-density polyethylene (LDPE) nanocomposite materials, the space charge and the conduction current up to the breakdown has been investigated under increasing DC ramp field. A negative charge was dominated in the 0 phr sample. A positive charge was dominated in nanocomoposite sample. The field increment (= the maximum field...
To understand DC breakdown phenomena of low density polyethylene (LDPE) mixed with nano-sized magnesium oxide (MgO), the electric properties, namely, DC breakdown strength, conduction current, space charge formation and local heat generation up to the breakdown under increasing field with a particular rate of increase was investigated. DC breakdown strength of nanocomposite was found to be high compared...
To understand the space charge formation of nano-sized magnesium oxide (MgO)/low-density polyethylene (LDPE) nanocomposite materials, the space charge up to the breakdown has been investigated under DC increasing ramp field. A negative charge was dominated in 0 phr sample. A positive charge was dominated in nano-composite sample. The field increment (= the maximum field - the average field) of 0 phr...
To understand basic electric properties of nano-sized magnesium oxide (MgO) / low-density polyethylene (LDPE) nanocomposite materials, the temperature dependence of breakdown strength and the space charge up to the breakdown has been investigated under DC ramp field. At temperatures at which these investigations were carried out, DC breakdown strength of the sample with the MgO nano-filler (hereafter,...
A nano-composite material is attracting many researchers' attention in the field of dielectric and electrical insulation. The purpose of this study is to investigate the influence of MgO filler size on electrical properties of MgO/LDPE nanocomposite. The volume resistivity, DC breakdown strength and the impulse breakdown strength of low-density polyethylene (LDPE) containing nano-filler or micro-filler...
To investigate possibility of the space charge measurement in the tape with a drug for percutaneous absorption and possibility of the control in space charge movement that might be corresponding to the drug movement by the external signal, the space charge was measured in the tape added a drug for percutaneous absorption. The positive space charge caused by addition a drug was accumulated in the sample...
To understand basic electric properties of nano-sized magnesium oxide (MgO) / low-density polyethylene (LDPE) nanocomposite under DC voltage application, DC breakdown strength and the space charge up to the breakdown under DC ramp voltage were investigated. DC breakdown strength of 1 phr sample contained 1 phr MgO nanofiller (hereafter, called 1phr sample) increased compared with that of 0 phr sample...
To understand basic electric properties of nano-sized magnesium oxide (MgO) / low-density polyethylene (LDPE) nanocomposite under DC voltage application, the volume resistivity, the space charge distribution and the breakdown strength were investigated. By the addition of nano-sized MgO filler, both the DC breakdown strength and the volume resistivity of LDPE increased. At the average DC electric...
To understand basic electric properties of nano-sized magnesium oxide (MgO)/low-density polyethylene (LDPE) nanocomposite under DC voltage application, the volume resistivity, the space charge distribution, the breakdown strength and the short circuit tree were investigated. By the addition of nano-sized MgO filler, both the DC breakdown strength and the volume resistivity of LDPE increased. At the...
Antistatic agent is often used for avoiding electrification of polymer films. In some cases, the film has a double-layer structure to improve its adhesive property. As an example, an ethylene-vinylacetate copolymer (EVA) film, in which an antistatistic agent is mixed, is laminated with a low-density polyethylene (LDPE) film. In such a case, there is a possibility that the antistatic property of the...
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