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Influence of high doses γ-irradiation on oxygen permeability of linear low-density polyethylene and cast polypropylene films (CROSBI ID 199918)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Klepac, Damir ; Ščetar, Mario ; Baranović, Goran ; Galić, Kata ; Valić, Srećko Influence of high doses γ-irradiation on oxygen permeability of linear low-density polyethylene and cast polypropylene films // Radiation physics and chemistry (1993), 97 (2014), 304-312. doi: 10.1016/j.radphyschem.2013.12.005

Podaci o odgovornosti

Klepac, Damir ; Ščetar, Mario ; Baranović, Goran ; Galić, Kata ; Valić, Srećko

engleski

Influence of high doses γ-irradiation on oxygen permeability of linear low-density polyethylene and cast polypropylene films

Linear low density polyethylene (PE-LLD) and cast polypropylene (PPcast) films were irradiated by γ- irradiation. The total irradiation dose varied from 0 kGy (unirradiated samples) to 200 kGy. Oxygen transport was investigated by a manometric method and the structural changes were studied by differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). Free radicals decay as a function of time was monitored by electron spin resonance (ESR) spectroscopy. The results show that the γ- irradiation reduces oxygen permeability coefficient in both films. The reduction was associated with an increase in crystallinity. DSC thermograms revealed a decrease in PPcast melting point with increasing irradiation dose, indicating higher degradation compared to PE-LLD. The observed peak in FTIR spectra for both samples at 1716 cm−1 corresponds to the stretching of the carbonyl and carboxylic groups which arise from the reaction of oxygen with the free radicals produced in the polymer matrix as a result of irradiation.

polyethylene; polypropylene; gamma-irradiation; oxygen permeability; ESR; FTIR

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Podaci o izdanju

97

2014.

304-312

objavljeno

0969-806X

10.1016/j.radphyschem.2013.12.005

Povezanost rada

Kemija, Prehrambena tehnologija

Poveznice
Indeksiranost