STUDIES ON THE IRRADIATION OF HIGH POLYMERS AT HIGH TEMPERATURES. II. THE EFFECTS OF OXYGEN AND TEMPERATURE ON THE GEL FORMATION OF POLY(VINYL ALCOHOL) IRRADIATED AT ELEVATED TEMPERATURES

Journal Article · Mon Jan 01 04:00:00 UTC 1962 · Doitai To Hoshasen (Japan) Discontinuedt) (Romania)

OSTI ID:4762925

Sakurada, I; Okada, T; Abe, H

Samples of 0.08 ~ 0.l3-mm thick PVA film with a water content of approx 5% were irradiated with a 1000-c Co/sup 60/ source at 3.75 x 10/sup 4/ r/hr under various conditions. The results showed that the weight loss of PVA was independent of the temperature and atmosphere but was directly proportional to the radiation dosage. A quantitative analysis of the PVA solubility data is described. G/sub q/ values of crosslinking were 1.5, 2.7, 4.5, and 30.4 in air, and 1.3, 1.6, 2.2, and 3.8 in vacuo for irradiation at 90, 120, 140, and 170 deg C, respectively. G values for the main fractures were 0.27, in vacuo under the same temperature dimensions. The activation energies of cross-linking and main chain fractures were 7.5 and 2.0 kcal/mole in air, and 2.7 and 2.2 kcal/mole in vacuo, respectively, above 100 deg C. Below this temperature, the activation energies decreased in both cases. (OID)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-16-031646
• OSTI ID: 4762925
• 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
ALCOHOLS
CHEMISTRY
COBALT 60
COLLOIDS
EXCITATION
GAMMA SOURCES
HIGH TEMPERATURE
IRRADIATION
LATTICES
LAYERS
OXYGEN
POLYMERIZATION
POLYMERS
POLYVINYLS
RADIATION DOSES
REACTION KINETICS
VACUUM
WATER