Radiation effect on polypropylene studied by the relaxational behaviour at low temperature using positron annihilation
✍ Scribed by Takenori Suzuki; Yuichi Oki; Masaharu Numajiri; Taichi Miura; Kenjiro Kondo; Nagayasu Oshima; Yasuo Ito
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 350 KB
- Volume
- 37
- Category
- Article
- ISSN
- 0032-3861
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✦ Synopsis
The irradiation effect of 7-rays on polypropylene (PP) has been studied through relaxational behaviour, using the positron annihilation lifetime (PAL) method. At low temperature, the intensity of a long-lived component of positronium, I3, for unirradiated PP samples increased due to a termination of the local thermal motion of polymer structures. At 100K, the increase in I3 of 1 MGy'7-ray irradiated samples became very small. However, the increase was observed again in the PP samples after 48 h of irradiation by positrons during the PAL experiment. This suggests a restructuring of the short polymer chains cut by 7-ray irradiation may occur.