Thermo-Stimulated Current and Dielectric Loss in Composite Materials

  • S. Nishijima
  • T. Okada
  • T. Hagihara
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 32)

Abstract

Thermo-stimulated current and dielectric loss measurements have been performed on five kinds of commercially available composite materials in order to study the electric properties of composite materials at low temperatures. Thermo-stimulated current measurements have been made on the composite materials in which the matrix quality was changed intentionally. The changes in the matrices were introduced by gamma irradiation or different curing conditions. Thermo-stimulated current and dielectric loss measurements revealed the number and the molecular weight of dipolar molecules. The different features of thermo-stimulated currents and dielectric losses were determined for different composite materials. The gamma irradiation and the curing conditions especially affect the thermo-stimulated current features. The changes in macroscopic mechanical properties reflect those of thermo-stimulated current. It was found that the change in quality and/or degradation of the composite materials could be detected by means of thermo-stimulated current and/or dielectric loss measurements.

Keywords

Epoxy Polyimide GFRP 

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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • S. Nishijima
    • 1
  • T. Okada
    • 1
  • T. Hagihara
    • 2
  1. 1.ISIR Osaka UniversityIbaraki, OsakaJapan
  2. 2.Department of PhysicsOsaka Kyoiku UniversityTennoji, OsakaJapan

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