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- W2084660265 abstract "The irradiation of polymeric materials with swift heavy ions (SHI) results in a change of their free volume properties which have strong correlation with their macroscopic properties. Positron annihilation lifetime spectroscopy (PALS) has been developed into a powerful characterization tool for the study of free volume and free volume fraction in polymers. Polyamide nylon-6 (PN-6) and polyethersulphone (PES) films of thickness of 250 μm were irradiated with C5+ ions of energy 70 MeV from 15 UD Pelletron accelerator at Inter University Accelerator Centre (IUAC), New Delhi, India. PN-6 films were irradiated to the fluences of 1011, 1012 and 1013 ions/cm2 whereas PES films were irradiated to the fluences of 9.3 × 1011, 9.3 × 1012 and 1.2 × 1013 ions/cm2. Characterization of the effect of ion irradiation on free volume has been done by PALS. The average free volume and fractional free volume obtained from long lived component, attributed to ortho-positronium (o-Ps) lifetime, are found to decrease with the fluence in both the cases. With increasing fluence, scissioned segments cross-link randomly, resulting in a decrease of average free volume due to overlapping of tracks." @default.
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- W2084660265 date "2007-03-01" @default.
- W2084660265 modified "2023-10-18" @default.
- W2084660265 title "Ion induced modification in free volume in PN-6 and PES polymers by positron annihilation lifetime studies" @default.
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- W2084660265 doi "https://doi.org/10.1016/j.nimb.2006.12.067" @default.
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