THE BEHAVIOURS OF FREE RADICALS TRAPPED BY $gamma$-IRRADIATED POLYETHYLENE
Journal Article
·
· J. Phys. Soc. Japan 15
Free radicals produced by gamma irradiation of polyethylene were investigated with electron spin resonance; the samples were either high-density (HD) or low-density (LD), and the irradiations were done in vacuum at room temperatare. The results were plotted on a radical yield vs irradiation dose graph, giving initial G-values (per 100 ev) of 0.5 and 0.3 for HD and LD, respectively. The ratio of yields for HD and LD is proportional to the ratio of their crystallinities, and it is concluded that free radicals are trapped in the crystalline regions. The effects of post-irradiation heating on the yields were also investigated for dose rates of 3 x 10/sup 7/ rad and the results plotted of their crystallinities, and it is concluded that free radicals are trapped in the crystalline regions. The effects of post-irradiation heating on the yields were also investigated for dose rates of 3 x 10/sup 7/ rad and the results plotted on a yield vs temperature graph. lt is seen that yields drop with temperature and that HD retains its yield better than LD; therefore, larger crystallites enist in HD than in LD. (D.L.C.)
- Research Organization:
- Japanese Assn. for Radiation Research on Polymers, Tokyo
- NSA Number:
- NSA-14-017873
- OSTI ID:
- 4198516
- Journal Information:
- J. Phys. Soc. Japan 15, Journal Name: J. Phys. Soc. Japan 15 Journal Issue: 6 Vol. Vol: 15; ISSN 0031-9015
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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