Kinetic study of the. gamma. radiolysis of polyethylene

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

DOI:https://doi.org/10.1002/pol.1979.170170917· OSTI ID:5854016

Mitsui, H; Shimizu, Y

A kinetic study was made of the formation of hydrogen and trans-vinylene unsaturation in the radiolysis of polyethylene induced by ..gamma.. rays with a dose rate of 6.35 x 10/sup 5/ rad/hr at 30 to 100/sup 0/C in vacuo. The rates of the formation of hydrogen and trans-vinylene unsaturation were described by the zero-order formation kinetics with respect to each concentration combined with the first-order disappearance. The apparent rate constant for the formation of hydrogen increased gradually with rising irradiation temperature to give the activation energy of 0.6 kcal/mole. On the other hand, those for the disappearance of hydrogen and the formation and disappearance of trans-vinylene unsaturation were almost independent of temperature. The G values for crosslinking and main-chain scission were obtained from the gel data by using the Charlesby-Pinner equation, and the activation energy of 1.5 kcal/mole was given for both of them. On the basis of these results the reactions induced by ..gamma.. rays in solid polyethylene were discussed.

• Research Organization: Japan Atomic Energy Research Inst., Takasaki
• OSTI ID: 5854016
• Journal Information: J. Polym. Sci., Polym. Chem. Ed.; (United States), Journal Name: J. Polym. Sci., Polym. Chem. Ed.; (United States) Vol. 17:9; ISSN JPLCA
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
ACTIVATION ENERGY
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CROSS-LINKING
DATA
DATA FORMS
DECOMPOSITION
DOSE RATES
ELECTROMAGNETIC RADIATION
ENERGY
EXPERIMENTAL DATA
GAMMA RADIATION
HIGH VACUUM
INFORMATION
IONIZING RADIATIONS
ISOLATED VALUES
KINETICS
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERIZATION
POLYMERS
POLYOLEFINS
PRESSURE DEPENDENCE
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOLYSIS
REACTION KINETICS
TEMPERATURE DEPENDENCE