| NUKLEONIKA 2010, 55(1):69-72
INFLUENCE OF LOW TEMPERATURE ON THE FREE VOLUME
IN POLYETHYLENE BY POSITRON ANNIHILATION
Wojciech Osoba
Institute of Physics, University of Silesia, 4 Uniwersytecka Str., 40-007 Katowice, Poland
Positron lifetime measurements were performed as a function of temperature in thermo-shrunken, modified polyethylene. Mean volume of free volume cavities in the investigated polymer was estimated from the results of the measurements. This mean volume turned out to be a smooth function of temperature (from room temperature to 8.5 K). The effect of trapping of free electrons, produced during positron irradiation, was observed at lowered temperature.
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