Naslov
Gas permeability of gamma-irradiated polyethylene and polypropylene films

Autori
Klepac, Damir ; Ščetar, Mario ; Galić, Kata ; Valić, Srećko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
POLYCHAR 20, World Forum on Advanced Materials, Book of Abstracts / Rogošić, Marko ; Macan, Jelena - Zagreb : Fakultet kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu, 2012, 256-256

ISBN
978-953-6470-57-0

Skup
POLYCHAR 20

Mjesto i datum
Dubrovnik, Hrvatska, 26.03.2012. - 30.03.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
gas permeability; polyethylene; polypropylene; gamma-irradiation; FTIR; DSC

Sažetak
Linear low density polyethylene (PE-LLD) and cast polypropylene (PPcast) films were irradiated by γ-irradiation. The total irradiation dose varied from 0 kGy (for nonirradiated 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). The results show that the γ-irradiation slightly reduces oxygen permeability coefficient in both films. The reduction was associated with an increase in crystallinity. DSC thermograms revealed a decrease in PPcast melting temperature with irradiation dose indicating higher degradation compared to polyethylene. 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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Prehrambena tehnologija

POVEZANOST RADA