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- W2139379823 abstract "Recently, porous or cellular polymer films have received a lot of interest as materials for sensor and actuator applications. Films of cellular polypropylene have shown superior electromechanical thickness response when compared to conventional non-porous piezoelectric polymer materials. The electromechanical effect in cellular films originates from electrical discharges across internal gas-filled cells during preparation. The resulting charge separation is different from the charge-separation and dipole-orientation processes in non-cellular piezoelectric films. The aim of this work is to study the relationship between the partial discharges inside the cellular PP and its piezoelectric response. The focus is on the physical effects in the film at the threshold voltage that leads to a piezoelectric response. We studied the effects of charging voltage and charging time on partial discharges, surface potential and piezoelectric coefficient for a few cellular-film grades with different thicknesses. Also, the visible electroluminescence from numerous spots across the film surface during corona charging has been studied." @default.
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- W2139379823 date "2003-06-25" @default.
- W2139379823 modified "2023-10-06" @default.
- W2139379823 title "Corona-induced partial discharges, internal charge separation and electromechanical transducer properties in cellular polymer films" @default.
- W2139379823 cites W1965155074 @default.
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- W2139379823 doi "https://doi.org/10.1109/ise.2002.1042942" @default.
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