Accession Number:

ADA639532

Title:

A Survey of Thermal Decomposition of Solid Insulations and Its Relevance to Breakdown Mechanisms in Partial Vacuum

Descriptive Note:

Corporate Author:

WRIGHT LAB WRIGHT-PATTERSON AFB OH AERO PROPULSION AND POWER DIRECTORATE

Personal Author(s):

Report Date:

1995-07-01

Pagination or Media Count:

7.0

Abstract:

Several practical issues must be considered when solid electrical insulation is used in a low pressure environment. While the low pressure environment or partial vacuum in this context, a region which is almost devoid of any gaseous media can exhibit good electrical insulating properties, the materials contained within the partial vacuum will effect the insulation integrity over time. Degradation of the insulating properties of the partial vacuum may be due to outgassing of enclosed materials andor adverse media contained in the natural vacuum space environment. This paper addresses the thermal degradation of some polymer materials typically used as electrical insulation in partial vacuum. Pyrolysis data for various polymers, from the literature, is discussed. The results of a survey of published pyrolysis data, which identifies the primary gaseous decomposition species for such materials, is presented. The importance of identifying these byproducts as they relate to microscopic volume breakdowns and partial discharges is highlighted.

Subject Categories:

  • Physical Chemistry
  • Polymer Chemistry
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE