Numéro
J. Phys. IV France
Volume 03, Numéro C4, Septembre 1993
4th International Workshop on Positron and Positronium Chemistry
Page(s) C4-271 - C4-273
DOI http://dx.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

Positron annihilation lifetime study of pure and Na(acac) treated polyvinylalcohol

A.M.A. EL-SAYED1, E.E. ABDEL-HADY1, M. MOHSEN2 and A. SAWABY3

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


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.



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