Original scientific paper

https://doi.org/10.5562/cca2768

Active Bilayer PE/PCL Films for Food Packaging Modified with Zinc Oxide and Casein

Ana Rešček orcid.org/0000-0002-3516-5062 ; PIK Vrbovec d.d., Zagrebačka 148, HR-10340 Vrbovec, Croatia
Ljerka Kratofil Krehula ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, P.O. Box 177, HR-10000 Zagreb, Croatia
Zvonimir Katančić ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, P.O. Box 177, HR-10000 Zagreb, Croatia
Zlata Hrnjak-Murgić ; Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, P.O. Box 177, HR-10000 Zagreb, Croatia

Abstract

This paper studies the properties of active polymer food packaging bilayer polyethylene/polycaprolactone (PE/PCL) films. Such packaging material consists of primary PE layer coated with thin film of PCL coating modified with active component (zinc oxide or zinc oxide/casein complex) with intention to extend the shelf life of food and to maintain the quality and health safety. The influence of additives as active components on barrier, mechanical, thermal and antimicrobial properties of such materials was studied. The results show that, in comparison to the neat PE and PE/PCL films, some of PE/PCL bilayer films with additives exhibit improved barrier properties i.e. decreased water vapour permeability. Higher thermal stability of modified PE/PCL material is obtained due to a modified mechanism of thermal degradation. The samples with the additive nanoparticles homogeneously dispersed in the polymer matrix showed good mechanical properties. Addition of higher ZnO content contributes to the enhanced antibacterial activity of a material.

Keywords

active packaging; casein; polyethylene; polycaprolactone; zinc oxide

Hrčak ID:

151219

URI

https://hrcak.srce.hr/151219

Publication date:

31.12.2015.

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