ACTA

The Influence of Deformation and Chemical Composition on Elementary Free Volumes in Glassy Polymers

V.P. Shantarovich^a, Yu.A. Novikov^b, Z.K. Suptel^a, E.F. Oleinik^a and M.C. Boyce^c
^a Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4 Kosygina str., 117334, Moscow, Russia
^b Institute of General Physics, Russian Academy of Sciences, 38 Vavilov str., 117942, Moscow, Russia
^c Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA

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A relation between positronium annihilation characteristics and concentration of elementary free volumes is considered for the case of positronium formation before its localization. We estimated the diffusion coefficient of nonlocalized positronium (≈10^-4 cm²/s). The positron annihilation lifetime studies of uniaxial compression and annealing of some glassy polymers revealed variations of the shape of elementary free volumes size-distributions.

DOI: 10.12693/APhysPolA.95.659
PACS numbers: 78.70.Bj