DIELECTRIC PROPERTIES OF $gamma$-RAY IRRADIATED METHYL-METHACRYLATE AND POLYMETHYL-METHACRYLATE

Journal Article · Wed Oct 01 00:00:00 EDT 1958 · Technol. Repts. Osaka Univ.

OSTI ID:4174734

Inuishi, Y; Sumitomo, H; Hayata, K

A methylmethacrylate (MMA) monomer was polymerized by Co/sup 60/ gamma irradiation. The breakdown strength of the monomer increased abruptly at the dosage where transition from the liquid monomer to the solid polymer occurred. Voltage measurement of a d-c current showed that the conduction is mainly of an ionic nature before breakdown and then results in sudden current multiplication. Polymethylmethacrylate resin, when irradiated with gamma rays from a Co/sup 60/ source at a dosage of 4 x 10/sup 7/ r, degrades to a polymer of smaller mean molecular weight. The d-c and impulse breakdown strengths decrease, and the conduction current is reduced. The lowering of d-c breakdown voltage is the result of increased ionic space charge. The lowering of impulse breakdown strength necessitates an electronic model. (OID)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-14-013037
• OSTI ID: 4174734
• Journal Information: Technol. Repts. Osaka Univ., Vol. Vol: 8; Other Information: Orig. Receipt Date: 31-DEC-60
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

METALS, CERAMICS, AND MATERIALS
COBALT 60
DECOMPOSITION
DIELECTRICS
ELECTRIC CHARGES
ELECTRIC CONDUCTIVITY
ELECTRIC POTENTIAL
FAILURES
GAMMA RADIATION
GAMMA SOURCES
IONS
IRRADIATION
LIQUIDS
MEASURED VALUES
METHACRYLATES
METHACRYLIC ACID
METHYL RADICALS
MOLECULES
POLYMERIZATION
POLYMERS
RADIATION EFFECTS
RESINS
SOLIDS
WEIGHT