J. Phys. IV France 03 (1993) C4-271-C4-273
Positron annihilation lifetime study of pure and Na(acac) treated polyvinylalcoholA.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
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