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Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties

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 (α), at levels much greater than that of conventional exfoliated clay layers (e.g., montmorillonite). A very small amount of mic...

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Autores principales: Uysal Unalan, Ilke, Boyacı, Derya, Trabattoni, Silvia, Tavazzi, Silvia, Farris, Stefano
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5618392/
https://www.ncbi.nlm.nih.gov/pubmed/28925951
http://dx.doi.org/10.3390/nano7090281
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author Uysal Unalan, Ilke
Boyacı, Derya
Trabattoni, Silvia
Tavazzi, Silvia
Farris, Stefano
author_facet Uysal Unalan, Ilke
Boyacı, Derya
Trabattoni, Silvia
Tavazzi, Silvia
Farris, Stefano
author_sort Uysal Unalan, Ilke
collection PubMed
description 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 (α), 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 ϕ ≈ 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 (≈12% and 23%, respectively) and PET coated with unloaded pullulan (≈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 ϕ ≈ 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.
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spelling pubmed-56183922017-09-29 Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties Uysal Unalan, Ilke Boyacı, Derya Trabattoni, Silvia Tavazzi, Silvia Farris, Stefano Nanomaterials (Basel) Article 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 (α), 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 ϕ ≈ 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 (≈12% and 23%, respectively) and PET coated with unloaded pullulan (≈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 ϕ ≈ 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. MDPI 2017-09-19 /pmc/articles/PMC5618392/ /pubmed/28925951 http://dx.doi.org/10.3390/nano7090281 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Uysal Unalan, Ilke
Boyacı, Derya
Trabattoni, Silvia
Tavazzi, Silvia
Farris, Stefano
Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties
title Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties
title_full Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties
title_fullStr Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties
title_full_unstemmed Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties
title_short Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties
title_sort transparent pullulan/mica nanocomposite coatings with outstanding oxygen barrier properties
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5618392/
https://www.ncbi.nlm.nih.gov/pubmed/28925951
http://dx.doi.org/10.3390/nano7090281
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