THE EFFECTS OF RADIATION ON THE DIELECTRIC PROPERTIES OF RUBBERS

Journal Article · Sun Oct 01 04:00:00 EDT 1961 · Denki Gakkai Zasshi (Japan)

OSTI ID:4791194

Shinohara, U; Inagaki, Y

Five different samples (~1 in. thick each) including 2 types of natural rubber, butyl rubber, neoprene gum, and silicone elastomer were irradiated by gamma rays from a 3000-c Co/sup 60/ source at the rate of 5 x 10/sup 5/ r/hr in air or in nitrogen gas occasionally. The effects observed at dose levels of 10 X 10/sup 6/r, 20 x 10/sup 6/ r, 40 x 10/sup 6/ r, and 80 x 10/sup 6/ r were: the molecular weight increased on oxidation, but decreased on reduction; the dielectric characteristics of the near nonpolar rubbers were deteriorated by oxidation; the dielectric properties of the polar neoprene gum variations were dependent upon the polar radicals and cross-linking rather than oxidation; and the molecular weights of all rubbers decreased when the samples were irradiated in N/sub 2/, with neoprene rubber showing the largest. The results funther confirmed the influence of the atmospheric condition under irradiation on these electrical insulating materials. (OlD)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-029450
• OSTI ID: 4791194
• Journal Information: Denki Gakkai Zasshi (Japan), Journal Name: Denki Gakkai Zasshi (Japan) Vol. Vol: 81; ISSN DGZAA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
BUTYL RADICALS
COBALT 60
DIELECTRICS
ELASTOMERS
ENVIRONMENT
GAMMA RADIATION
GAMMA SOURCES
IRRADIATION
METALS, CERAMICS, AND OTHER MATERIALS
MOLECULES
NEOPRENE
NITROGEN
OXIDATION
POLYMERIZATION
RADIATION DOSES
RADIATION EFFECTS
REDUCTION
RUBBER
SILICONES
WEIGHT