space_esd - Measurement of the Internal Space Charge...

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Measurement of the Internal Space Charge Behavior for the Study of the Electrostatic Phenomena ~~~~~~l Polymers Kaon Fukunaga and Takashi Maeno Communications Research Laboratory Nukui-Kitamachi, Koganei, Tokyo1 84, JAPAN ABS resin polyimide polypropylene poly(tetrafluorcethy1ene) polystyrene poly(viny1 chloride) Abstract Ami-ESD polymers with polymer solid electrolytes Most polymer dielectric materials can store surface charges, which may accumulate and cause an electrostatic discharge (ESD) . This phenomenum has become a serious problem because the electromagnetic noise associated with an ESD damages electronic circuits in various kinds of apparatus [l]. The accumulation of surface charge on a polymer dielectric material is conventionally prevented by using surface-active agents or conductive fillers to reduce the surface resistivity, thus enabling the charge on the polymer to leak away. New anti-ESD polymers, on the other hand, contains polymer solid electrolytes and prevent ESD even though their resistivity is high. Since these polymers have charges in them originally, the measurement of their space charge distribution should be helpful in describing their features. We therefore measured the space charge distribution inside some polymer films by using the newly developed pulsed electroacoustic method and showed that a poly(viny1 chloride) film initially has internal charge and generates an electric field by itself. We found that three kmds of anti-ESD materials using different polymer solid-electrolytes can produce the internal space charge electric fields under DC voltage application, thereby compensating the external electric field. These results suggest that space charge measurement is useful in fundamental research of ESD. TYF A TYF c Introduction Other anti-ESD materials Polymer dielectric materials tend to store charges on their surfaces because of their resistivity is high, and these accumulated charges can cause an electrostatic discharge (ESD) to occur. It is widely known that conductive materials such as carbon black or fine grains of metals are used as fillers in the polymers, or the polymer surfaces are coated with surface-active agents, to prevent such discharges [2]. New kinds of anti-ESD polymers have been developed by using the polymer solid electrolytes which are also used in polymer batteries. These new functional polymers can prevent ESDs semipemanently in any surrounding Surface-active agent type Carbon black filler type Ceramic electrolyte coating conditions although their surface resistivities are high about 10'' &2. ESD phenomena have been investigated by measuring surface potential and surface resistivity, but the mechanism by which these new anti-ESD polymers prevent ESDs has not been understood, because these values do not directly describe the internal charge behavior. We have therefore used the high-resolution pulsed electroacoustic (PEA) method [3]
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This note was uploaded on 06/11/2011 for the course ELECTRICAL 124 taught by Professor Ghjk during the Spring '11 term at Institute of Technology.

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space_esd - Measurement of the Internal Space Charge...

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