Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.14365/2540
Title: Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties
Authors: Unalan, Ilke Uysal
Boyaci, Derya
Trabattoni, Silvia
Tavazzi, Silvia
Farris, Stefano
Keywords: coefficient of friction
haze
mica
modelling
optical properties
oxygen barrier
pullulan
Shear-Stiff
Microfibrillated Cellulose
Mechanical-Properties
Mica
Films
Publisher: Mdpi
Abstract: This study presents a new bionanocomposite coating on poly(ethylene terephthalate) (PET) made of pullulan and synthetic mica. Mica nanolayers have a very high aspect ratio (alpha), at levels much greater than that of conventional exfoliated clay layers (e.g., montmorillonite). A very small amount of mica (0.02 wt %, which is phi approximate to 0.00008) in pullulan coatings dramatically improved the oxygen barrier performance of the nanocomposite films under dry conditions, however, this performance was partly lost as the environmental relative humidity (RH) increased. This outcome was explained in terms of the perturbation of the spatial ordering of mica sheets within the main pullulan phase, because of RH fluctuations. This was confirmed by modelling of the experimental oxygen transmission rate (OTR) data according to Cussler's model. The presence of the synthetic nanobuilding block (NBB) led to a decrease in both static and kinetic coefficients of friction, compared with neat PET (approximate to 12% and 23%, respectively) and PET coated with unloaded pullulan (approximate to 26% reduction in both coefficients). In spite of the presence of the filler, all of the coating formulations did not significantly impair the overall optical properties of the final material, which exhibited haze values below 3% and transmittance above 85%. The only exception to this was represented by the formulation with the highest loading of mica (1.5 wt %, which is phi approximate to 0.01). These findings revealed, for the first time, the potential of the NBB mica to produce nanocomposite coatings in combination with biopolymers for the generation of new functional features, such as transparent high oxygen barrier materials.
URI: https://doi.org/10.3390/nano7090281
https://hdl.handle.net/20.500.14365/2540
ISSN: 2079-4991
Appears in Collections:PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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