Next Article in Journal
Differential Effects of Surface-Functionalized Zirconium Oxide Nanoparticles on Alveolar Macrophages, Rat Lung, and a Mouse Allergy Model
Next Article in Special Issue
Ionic Liquids as Surfactants for Layered Double Hydroxide Fillers: Effect on the Final Properties of Poly(Butylene Adipate-Co-Terephthalate)
Previous Article in Journal
Development and Biocompatibility Evaluation of Photocatalytic TiO2/Reduced Graphene Oxide-Based Nanoparticles Designed for Self-Cleaning Purposes
Previous Article in Special Issue
Water Diffusion through a Titanium Dioxide/Poly(Carbonate Urethane) Nanocomposite for Protecting Cultural Heritage: Interactions and Viscoelastic Behavior
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Nanomaterials 2017, 7(9), 281; doi:10.3390/nano7090281

Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding 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
*
Authors to whom correspondence should be addressed.
Received: 31 August 2017 / Revised: 14 September 2017 / Accepted: 15 September 2017 / Published: 19 September 2017
(This article belongs to the Special Issue Polymer Nanocomposites)
View Full-Text   |   Download PDF [2282 KB, uploaded 21 September 2017]   |  

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 (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. View Full-Text
Keywords: coefficient of friction; haze; mica; modelling; optical properties; oxygen barrier; pullulan coefficient of friction; haze; mica; modelling; optical properties; oxygen barrier; pullulan
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Uysal Unalan, I.; Boyacı, D.; Trabattoni, S.; Tavazzi, S.; Farris, S. Transparent Pullulan/Mica Nanocomposite Coatings with Outstanding Oxygen Barrier Properties. Nanomaterials 2017, 7, 281.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Nanomaterials EISSN 2079-4991 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top