Effect of large dosage irradiation in air on polyethylene. [Gamma radiation]

Journal Article · Mon Nov 01 04:00:00 EST 1982 · J. Appl. Polym. Sci.; (United States)

DOI:https://doi.org/10.1002/app.1982.070271102· OSTI ID:6198058

Fujimura, T; Hayakawa, N; Kuriyama, I

The large dosage irradiation effect on polyethylene in air was examined by the method of double irradiation. Polyethylene was first irradiated with ..gamma..-rays to a dosage of a few hundred Mrad in air at 298/sup 0/K. The formed radicals were destroyed, and the polymer, changed chemically and morphologically, was irradiated again in vacuo at 77/sup 0/K with a dose of 12.7 Mrad. The thermal decay of radicals produced in polyethylene by the second irradiation was investigated. The results were compared with the sample not exposed to the first irradiation. The results were also compared with previous data of polyethylene irradiated in vacuo to a great extent and then treated in the same manner as that in the present experiment. The results show that scission of the polymer chain by oxidation makes the radical decay faster. Simultaneously, crosslinks formed in polyethylene irradiated in air to a great extent slow down the radical decay. Almost the same number of double bonds was formed in polyethylene irradiated in air as in polyethylene irradiated in vacuo. These double bonds react with alkyl radicals to form allyl radicals.

• Research Organization: Japan Atomic Energy Research Inst., Gunma
• OSTI ID: 6198058
• Journal Information: J. Appl. Polym. Sci.; (United States), Journal Name: J. Appl. Polym. Sci.; (United States) Vol. 27:11; ISSN JAPNA
• 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
AIR
ALKYL RADICALS
ALLYL RADICALS
CHEMICAL BONDS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMISTRY
ELECTROMAGNETIC RADIATION
FLUIDS
GAMMA RADIATION
GASES
IONIZING RADIATIONS
KINETICS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
POLYETHYLENES
POLYMERS
POLYOLEFINS
PRESSURE DEPENDENCE
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADICALS
REACTION KINETICS
SPECTRA
TEMPERATURE DEPENDENCE
THERMAL DEGRADATION