RADIATION-INDUCED PARTIAL IONIC (PARTIAL RADICAL) POLYMERIZATION OF ISOPRENE

Journal Article · Tue Nov 01 04:00:00 EST 1960 · Doitai To Hoshasen (Japan) Discontinuedt) (Romania)

OSTI ID:4814956

Shimozawa, R; Tabata, Y; Sobue, H

gamma -ray induced polymerization of isoprene was investigated in the temperature range from --78 deg C to 40 deg C. The effects of additives, temperature, and dose rate on the polymerization rate were studied in this temperature range. 1,1-Diphenyl-2-picrylhydrazyl strongly retarded polymerization at high temperatures, while pyridine retarded it at low temperatures. A linear relationship could not be observed in Arrhenius' plot of the polymerization rate. The over-all polymerization rate was separated into radical and ionic contributions. The structure of the polyisoprene obtained at -- 78 deg C was similar to that of the polyisoprene obtained by cationic catalysis. The radiationinduced polymerization of isoprene was predominantly a radical one. At intermediate temperatures, both the cationic and radical mechanisms were operative concurrently. (OID)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-022193
• OSTI ID: 4814956
• Journal Information: Doitai To Hoshasen (Japan) Discontinuedt) (Romania), Journal Name: Doitai To Hoshasen (Japan) Discontinuedt) (Romania) Vol. Vol: 3; ISSN DOHOA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BUTADIENE
CATALYSIS
CATIONS
CHEMISTRY
DPPH
FREE RADICALS
GAMMA RADIATION
HYDRAZIDES
IMPURITIES
ISOPRENE
METHYL RADICALS
NITRATES
ORGANIC NITROGEN COMPOUNDS
PHENOLS
PHENYL RADICALS
PICRYL RADICALS
POLYMERIZATION
PYRIDINES
RADIATION CHEMISTRY
RADIATION DOSES
REACTION KINETICS
TEMPERATURE
TESTING