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Gamma irradiation of PolyEthyleneTerephthalate and PolyEthyleneNaphthalate |
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| Authors: | Mario Mariani Ugo Ravasio Armando Buttafava Antonio Faucitano |
| Affiliation: | a Dipartimento di Ingegneria Nucleare, Politecnico di Milano, via Ponzio 34/3, 20133 Milano, Italy b Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy c Dipartimento di Chimica Generale, Università degli Studi, via Taramelli 12, 27100 Pavia, Italy |
| Abstract: | The effect of gamma irradiation in air is investigated in two thermoplastic polyesters (PET and PEN), in order to evaluate the influence of aromatic density and the role of oxygen on radiation resistance. EPR measurements were carried out to detect radical stability against oxygen permeation and to provide radical characterization. Viscometric data reveal a different behaviour between films and thick samples. Positron annihilation spectra show a decrease of ortho-positronium intensity, which is more marked in film samples. ortho-positronium lifetime does not depend on the radiation dose. |
| Keywords: | 78 70 Bj 76 30 &minus v 61 82 Pv |
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