Evaluation of crosslinking and scission yields in the degradation of polystyrene by. gamma. -irradiation in air
Journal Article
·
· J. Polym. Sci., Polym. Chem. Ed.; (United States)
A sample of polystyrene with narrow molecular weight distribution (anti M/sub w//anti M/sub n/ = 1.03) has been formed into a 3-mm sheet and subjected to ..gamma..-irradiation at 25/sup 0/C in air. Simultaneous crosslinking and scission of polymer chains resulted. Analyses by velocity and equilibrium sedimentation, gel-permeation chromatography, and osmometry of the polystyrene subjected to doses in the range 0 to 90 Mrad, all within the pre-gel region, have yielded average values of G(S) = G(X) = 0.022 +- 0.002 for the complete sample. Combination of these various experimental techniques has been successful in yielding consistent values of G(S) and G(X) and should be applicable with advantage to other polymers, particularly when neither G(S) nor G(X) is zero. The wide variation in literature values of G(S) and G(X) for irradiation of polystyrene under vacuum precludes any unequivocal conclusion on the effect of air on the radiation yields.
- Research Organization:
- Univ. of Queensland, Australia
- OSTI ID:
- 5252003
- Journal Information:
- J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 15:12; ISSN JPLCA
- Country of Publication:
- United States
- Language:
- English
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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
CROSS-LINKING
DECOMPOSITION
ELECTROMAGNETIC RADIATION
G VALUE
GAMMA RADIATION
IONIZING RADIATIONS
MEDIUM TEMPERATURE
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERIZATION
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
360406 -- Materials-- Polymers & Plastics-- Radiation Effects-- (-1987)
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CROSS-LINKING
DECOMPOSITION
ELECTROMAGNETIC RADIATION
G VALUE
GAMMA RADIATION
IONIZING RADIATIONS
MEDIUM TEMPERATURE
MOLECULAR WEIGHT
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYMERIZATION
POLYMERS
POLYOLEFINS
POLYSTYRENE
POLYVINYLS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS