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Charging and charge-detection methods and their use in the characterization of polymer-electret materials

  • R. Gerhard-Multhaupt
  • G. M. Sessler
Conference paper
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 78)

Abstract

Recently developed methods for charging and investigating polymer electrets are described and discussed in view of their use for the characterization of the respective sample material. Surface charging with electron beams of relatively low energies may be used to achieve positive charging and to determine the secondary-electron emission yield of the specimen. Laser-induced pressure pulses permit the scanning of charge and polarization profiles as well as the measurement of ultrasonic velocity and attenuation. Poling of piezoelectric polymer electrets may be performed by several techniques including electron-beam charging which leads to polarization zones of predetermined thickness inside the samples; poling-current measurements can be utilized to estimate the ferroelectric polarization in the samples and to model the feroelectric-switching behavior of the dipoles.

Key words

Electrets secondary-electron emission charge and polarization profiles sound velocity and attenuation poling techniques 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1998

Authors and Affiliations

  • R. Gerhard-Multhaupt
    • 1
  • G. M. Sessler
    • 2
  1. 1.Heinrich-Hertz-Institut für NachrichtentechnikBerlin 10F.R.G.
  2. 2.Institut für ElektroakustikTechnische Hochschule DarmstadtDarmstadtF.R.G.

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