gamma. -radiation-induced crosslinking of polystyrene

Journal Article · Wed Aug 01 04:00:00 EDT 1979 · J. Polym. Sci., Polym. Chem. Ed.; (United States)

DOI:https://doi.org/10.1002/pol.1979.170170805· OSTI ID:6012191

Shimizu, Y; Mitsui, H

The ..gamma..-radiation-induced crosslinking of polystyrene was studied at 30 to 100/sup 0/C in vacuo with a dose rate of 6.35 x 10/sup 5/ rad/hr. The amount of hydrogen formation increased with increasing irradiation time, and the rate of the formation decreased with the time. The results were well described by the zero-order formation kinetics with respect to the hydrogen concentration combined with the first-order disappearance. The apparent rate constant for the formation of hydrogen increased somewhat with rising irradiation temperature, and the one for the disappearance was little affected by the temperature. The gel fraction increased with the time by the irradiation beyond the critical time for incipient gel formation, and the rate of gel formation decreased with the time. The gel formation was retarded by rising irradiation temperature, and only a little gel fraction was observed at 100/sup 0/C. The G values for the crosslinking and main-chain scission were obtained from the gel data by using the Charlesby--Pinner equation. On the basis of these results, the mechanism of the ..gamma..-radiation-induced crosslinking of polystyrene was discussed. 5 figures, 1 table.

• Research Organization: Japan Atomic Energy Research Inst., Gunma, Japan
• OSTI ID: 6012191
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 17:8; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360406 -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
COLLOIDS
CROSS-LINKING
CRYOGENIC FLUIDS
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
G VALUE
GAMMA RADIATION
GELS
HYDROGEN
IONIZING RADIATIONS
KINETICS
MEDIUM TEMPERATURE
NONMETALS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERIZATION
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
REACTION KINETICS