Positron Annihilation Studies of Polyethylene-Carbon Black Composites |
| M. Kostrzewa, Z. Michno Physics Laboratory, Technical University, Ozimska 75, 45-370 Opole, Poland and T. Majcherczyk Institute of Chemistry, Opole University, Oleska 48, 45-052 Opole, Poland |
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| Results of investigations of the angular correlation of annihilation radiation and positron annihilation lifetime measurements are presented for polyethylene-carbon black composites. The inhibition of positronium formation due to the carbon black introduction is evidenced by a decrease in intensities of the narrow component in angular correlation of annihilation radiation curves and of the longest-lived components in positron annihilation lifetime spectra. A qualitative interpretation of the data in terms of the free-volumes model is proposed. |
| DOI: 10.12693/APhysPolA.88.193 PACS numbers: 71.60.+z, 78.70.Bj, 82.30.Ηk |