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
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