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Coatings 2016, 6(1), 4;

Development of Antibacterial Composite Films Based on Isotactic Polypropylene and Coated ZnO Particles for Active Food Packaging

Institute of Polymers, Composites and Biomaterials, Consiglio Nazionale delle Ricerche (IPCB/CNR) Via Campi Flegrei 34, Naples 80078, Italy
Istituto per le Macchine Agricole e Movimento Terra, Consiglio Nazionale delle Ricerche (IMAMOTER-CNR) Strada delle Cacce 73, Torino 10135, Italy
Author to whom correspondence should be addressed.
Academic Editor: Stefano Farris
Received: 11 December 2015 / Revised: 13 January 2016 / Accepted: 15 January 2016 / Published: 22 January 2016
(This article belongs to the Special Issue Food and Beverage Packaging Coatings)
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This study was aimed at developing new films based on isotactic polypropylene (iPP) for food packaging applications using zinc oxide (ZnO) with submicron dimension particles obtained by spray pyrolysis. To improve compatibility with iPP, the ZnO particles were coated with stearic acid (ZnOc). Composites based on iPP with 2 wt % and 5 wt % of ZnOc were prepared in a twin-screw extruder and then filmed by a calender. The effect of ZnOc on the properties of iPP were assessed and compared with those obtained in previous study on iPP/ZnO and iPP/iPPgMA/ZnO. For all composites, a homogeneous distribution and dispersion of ZnOc was obtained indicating that the coating with stearic acid of the ZnO particles reduces the surface polarity mismatch between iPP and ZnO. The iPP/ZnOc composite films have relevant antibacterial properties with respect to E. coli, higher thermal stability and improved mechanical and impact properties than the pure polymer and the composites iPP/ZnO and iPP/iPPgMA/ZnO. This study demonstrated that iPP/ZnOc films are suitable materials for potential application in the active packaging field. View Full-Text
Keywords: isotactic polypropylene; zinc oxide; properties; active packaging; composites isotactic polypropylene; zinc oxide; properties; active packaging; composites

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Silvestre, C.; Duraccio, D.; Marra, A.; Strongone, V.; Cimmino, S. Development of Antibacterial Composite Films Based on Isotactic Polypropylene and Coated ZnO Particles for Active Food Packaging. Coatings 2016, 6, 4.

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