Electrical Conductivity of Biaxially Oriented Polypropylene Under High Field at Elevated Temperature

Report No. ARL-TR-5720
Authors: Janet Ho and Richard Jow
Date/Pages: September 2011; 18 pages
Abstract: Although biaxially oriented polypropylene thin films are a common dielectric for many high voltage pulsed power capacitor applications, the electrical conductivity under high fields at elevated temperatures is mostly unknown. Such knowledge is valuable for improving the understanding of the origin of the charge species and transport mechanisms at high fields. Results suggested that conduction is by hopping with the hopping distance increasing from 1.4 nm at 35 °C to 3.2 nm at 100 °C. The thermal activation energy was determined to be 0.75 eV and field-independent. Such a finding allows the use of an Arrhenius term and a field-dependent term to describe the field-dependent conductivity up to breakdown.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2011