The Influence of Deformation and Chemical Composition on Elementary Free Volumes in Glassy Polymers |
V.P. Shantarovicha, Yu.A. Novikovb, Z.K. Suptela, E.F. Oleinika and M.C. Boycec 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 |