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1 Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie

1 2001

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Positron annihilation studies of gamma irradiation effects on UV-cured polymers based on acrylate oligomers

Hyla M., Filipecki J., Świątek J., Mervinskii R. I.

Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie

2001

Vol. 5

155--159

Positron annihilation Iifetime spectroscopy is applied to the study of gamma irradiation effect on polymers based on the acrylate oligomers. The gamma irradiation of Co60 was carried out in air, with a flux of 20 Gy s-1. The measurements were made on specimens with different absorbed dose in the range 10-100 kGy. The longest lifetime, τ3, in three-component analyses of the spectra was associated with the pickoff annihilation of ortopositronium trapped in voids. After irradiation changes in the lifetimes are observed. The intensity of the longest-Iived component, I3, increases in comparison with the as-received sample. These results are discussed on the basis of free volume model.