| Issue |
J. Phys. IV France
Volume 03, Number C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
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|---|---|---|
| Page(s) | C4-271 - C4-273 | |
| DOI | https://doi.org/10.1051/jp4:1993442 | |
4th International Workshop on Positron and Positronium Chemistry
J. Phys. IV France 03 (1993) C4-271-C4-273
DOI: 10.1051/jp4:1993442
1 Department of Physics, Faculty of Science, El-Minia University, El-Minia, Egypt
2 Department of Physics, Faculty of Science, Ain Shams University, Cairo, Egypt
3 NRC, Department of Physics, Dokki, Cario, Egypt
© EDP Sciences 1993
J. Phys. IV France 03 (1993) C4-271-C4-273
DOI: 10.1051/jp4:1993442
Positron annihilation lifetime study of pure and Na(acac) treated polyvinylalcohol
A.M.A. EL-SAYED1, E.E. ABDEL-HADY1, M. MOHSEN2 and A. SAWABY31 Department of Physics, Faculty of Science, El-Minia University, El-Minia, Egypt
2 Department of Physics, Faculty of Science, Ain Shams University, Cairo, Egypt
3 NRC, Department of Physics, Dokki, Cario, Egypt
Abstract
Positron annihilation lifetime studies of pure and treated polyvinyl alcohol (PVA) reflect the effect of concentration as well as temperature on free volume. Therefore, variations of the lifetime of the o-Ps longlived component τ3 and the probability of its formation I3 have been studied and correlated with changes in the electrical conductivity σ as well as with X-ray diffraction data. For the 10% treated sample the existence of large ionic charge carriers could be concluded from a large value of the critical free volume.
© EDP Sciences 1993