Accession Number:

AD0757720

Title:

The Development of Radiation-Resistant Insulators.

Descriptive Note:

Final rept. 1 Jul 66-15 Jan 72,

Corporate Author:

OAK RIDGE NATIONAL LAB TENN

Personal Author(s):

Report Date:

1973-02-01

Pagination or Media Count:

105.0

Abstract:

The electrical properties of capacitor insulation the critical component in ion- chamber, quartz-fiber dosimeters were related to theories of conduction and dielectric relaxation in insulators. A GENERAL SURVEY REVEALED THAT A K2S2O8- initiated, emulsion-polymerized copolymer of styrene and alpha-methyl styrene had a uniquely rapid decay of conductivity following irradiation. The decay of conductivity resulted from removal of mobile charge carriers identified as electrons or holes by a polar phase uniformly dispersed through the polymer by association with sulfate chain ends. A recipe for polymerization of a styrene homopolymer having such trapping species was optimized for moisture sensitivity and fabrication characteristics. Rapid decay was also achieved by incorporation of organic phosphites in solution-cast plastic films. It was found that acid groups methacrylic, maleic copolymerized with styrene were without effect on postirradiation conductivity. Effective trapping was produced, however, by neutraliza-tion and incorporation of water or emulsifier. This demonstrated that trapping action was not associated with a unique chemical composition but with a strongly polar phase uniformly distributed through the polymer. Author-PL

Subject Categories:

  • Radiation and Nuclear Chemistry
  • Plastics
  • Radioactivity, Radioactive Wastes and Fission Products

Distribution Statement:

APPROVED FOR PUBLIC RELEASE