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Nanomaterials 2016, 6(12), 244; doi:10.3390/nano6120244

Graphene Oxide Bionanocomposite Coatings with High Oxygen Barrier Properties

1
DeFENS, Department of Food, Environmental and Nutritional Sciences—Packaging Division, University of Milan, via Celoria 2-20133 Milan, Italy
2
Department of Food Engineering, Faculty of Engineering, İzmir University of Economics, İzmir 35330, Turkey
3
School of Packaging, Michigan State University, East Lansing, MI 48824, USA
4
Department of Food Engineering, Izmir Institute of Technology, İzmir 35430, Turkey
5
Department of Materials Science, University of Milano Bicocca, via Cozzi 55-20125 Milan, Italy
6
INSTM, National Consortium of Materials Science and Technology, Local Unit University of Milan, via Celoria 2-20133 Milan, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Mikael S. Hedenqvist
Received: 20 November 2016 / Revised: 10 December 2016 / Accepted: 13 December 2016 / Published: 21 December 2016
(This article belongs to the Special Issue Multifunctional Polymer-Based Nanocomposites)
View Full-Text   |   Download PDF [1888 KB, uploaded 21 December 2016]   |  

Abstract

In this work, we present the development of bionanocomposite coatings on poly(ethylene terephthalate) (PET) with outstanding oxygen barrier properties. Pullulan and graphene oxide (GO) were used as main polymer phase and nanobuilding block (NBB), respectively. The oxygen barrier performance was investigated at different filler volume fractions (ϕ) and as a function of different relative humidity (RH) values. Noticeably, the impermeable nature of GO was reflected under dry conditions, in which an oxygen transmission rate (OTR, mL·m−2·24 h−1) value below the detection limit of the instrument (0.01 mL·m−2·24 h−1) was recorded, even for ϕ as low as 0.0004. A dramatic increase of the OTR values occurred in humid conditions, such that the barrier performance was totally lost at 90% RH (the OTR of coated PET films was equal to the OTR of bare PET films). Modelling of the experimental OTR data by Cussler’s model suggested that the spatial ordering of GO sheets within the main pullulan phase was perturbed because of RH fluctuations. In spite of the presence of the filler, all the formulations allowed the obtainment of final materials with haze values below 3%, the only exception being the formulation with the highest loading of GO (ϕ ≈ 0.03). The mechanisms underlying the experimental observations are discussed. View Full-Text
Keywords: graphene oxide; haze; modelling; oxygen transmission rate; pullulan; relative humidity graphene oxide; haze; modelling; oxygen transmission rate; pullulan; relative humidity
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MDPI and ACS Style

Uysal Unalan, I.; Boyacı, D.; Ghaani, M.; Trabattoni, S.; Farris, S. Graphene Oxide Bionanocomposite Coatings with High Oxygen Barrier Properties. Nanomaterials 2016, 6, 244.

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