THE RADICAL SCAVENGING REACTION OF DDPH IN A SOLID POLYMER

Journal Article · Mon May 01 04:00:00 EDT 1961 · Doitai To Hoshasen (Japan) Discontinuedt) (Romania)

OSTI ID:4769655

Okamura, S; Manabe, T; Toriuchi, Y

ABS>Polymethyl methacrylate (PMMA) films containing DPPH were irradiated with Co/sup 60/ gamma rays at 5 x 10/sup 4/ to 1.8 x 10/sup 5/ r/h r in air. The disappearance of DPPH in the polymer was measured spectroscopically. The G- value of the radical formation of PMMA calculated from the DPPH disappearance rate was 2.8 which was much smaller than the 12.5 for MMA. The critical concentrations of DPPH in solid polymers were also found to be much higher than those in solution. Hence, the efficiencies of the radical scavenging reaction of DPPH in solid polymers were lower than those in liquids. The protective effects of DPPH on PMMA observed during the radiation decomposition of the latter were probably due to the capture of side-chain radicals. The scavenger reaction of DPPH for radicals produced by the thermal decomposition of benzoyl peroxide in PMMA is also discussed. (OID)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-030454
• OSTI ID: 4769655
• Journal Information: Doitai To Hoshasen (Japan) Discontinuedt) (Romania), Journal Name: Doitai To Hoshasen (Japan) Discontinuedt) (Romania) Vol. Vol: 4; ISSN DOHOA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

AIR
CAPTURE
CHEMISTRY
COBALT 60
DECOMPOSITION
DPPH
FREE RADICALS
GAMMA SOURCES
IRRADIATION
LIQUIDS
MEASURED VALUES
METHACRYLIC ACID
ORGANIC NITROGEN COMPOUNDS
OXIDES
PEROXIDES
POLYMERS
PRECIPITATION
RADIATION DOSES
REACTION KINETICS
SOLIDS
SPECTROSCOPY