Naslov
Gas Transport and Thermal Characterization of Mono- and Di-Polyethylene Films Used for Food Packaging

Autori
Mrkić, Saša ; Galić, Kata ; Ivanković, Marica ; Hamin, Sandra ; Ciković, Nada

Izvornik
Journal of Applyed Polymer Science (0021-8995) 99 (2006), 4; 1590-1599

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
DSC; gas permeability; laminates; monofilms; polyethylene

Sažetak
The permeability of carbon dioxide, oxygen, nitrogen and air through commercial monolayer and multilayer films, based on polyethylene (PE), biaxially oriented polypropylene (BOPP) and polyamide (PA), used for food packaging is reported. The influence of temperature (from 10 to 60oC) on permeability and DSC characteristics changes was also analyzed. Literature data for gas permeability of the mentioned monofilms are quite variable due to differences in additives, thermal history, and crystallinity. In this work the highest gas permeability is obtained for PE film at the higher temperature (50-60oC). Laminates exhibit different gas permeation behavior from that of monofilms. Generally, gas solubility coefficient increases at higher temperature (with an exception of PA/PE and BOPPcoex.met/PE), being higher for monofilms in comparison with laminates, while diffusion coefficients are lower for monofilms in comparison with laminates. The temperature dependence of the permeability, diffusivity and solubility of gases shows two different regions in PE, BOPPcoex/PE (10-40oC and 40-60oC), PA/PE and BOPPcoex.met (10-30oC and 40-60oC) films. Correlation between activation energies for permeation and diffusion as well as heat of sorption and 17 gas properties is performed.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

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