Gamma irradiation effect upon positron annihilation in ultra high molecular weight poly(ethylene oxide)

Authors
Misheva, M Djourelov, N Nedkov, ET
Citation
M. Misheva et al., Gamma irradiation effect upon positron annihilation in ultra high molecular weight poly(ethylene oxide), RADIAT PH C, 62(5-6), 2001, pp. 379-385
Citations number
21
Categorie Soggetti
Physics
Journal title
RADIATION PHYSICS AND CHEMISTRY
ISSN journal
0969806X → ACNP
Volume
62
Issue
5-6
Year of publication
2001
Pages
379 - 385
Database
ISI
SICI code
0969-806X(200112)62:5-6<379:GIEUPA>2.0.ZU;2-Z
Abstract
Positron annihilation technique was used to reveal the evolution of small p ore structure of semi-crystalline ultra high molecular weight poly(ethylene oxide) under gamma -irradiation. It has been established that the structur e of poly(ethylene oxide) is improved under low dose irradiation (< 20 kGy) , while the concentration of free-volume holes in amorphous regions increas es at higher doses. The results were compared with those from small angle X -ray scattering and wide angle X-ray scattering measurements of the same sa mples. (C) 2001 Elsevier Science Ltd. All rights reserved.