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1 Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

1 2004

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Space charge characteristics in polymer dielectric films

100%

Fujita S. , Kamei Y.

tom Vol. 40, nr 15

242-247

These the space charge density in polyimide films (thickness of 125 µm) was measured using the pulsed-electroacoustic (PEA) method at room temperature in air. The specimen is set between the upper and lower electrodes. Pulse voltage is applied between the electrodes to vibrate the space charge in the specimen and generate an elastic wave. Using a piezoelectric element adhered to the lower electrode, the elastic wave is converted into an electrical signal. The signal is measured with a digital oscilloscope via an amplifier and analyzed by a computer to obtain the space charge density and distribution. The negative d.c. voltage was applied to the specimen from the upper electrode. The negative space charges appeared on the upper side of the specimen and the positive space charges appeared of the lower side of the specimen increased as the voltage was increased. Moreover, the space charge density of PEEK(Poly-Ether-Ether-Ketone) was measured and we are studying the differences in these both characteristics at present.