Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/6709
Title: Transparent pullulan/mica nanocomposite coatings with outstanding oxygen barrier properties
Authors: Uysal Ünalan, İlke
Boyacı, Derya
Trabattoni, Silvia
Tavazzi, Silvia
Farris, Stefano
Boyacı, Derya
Keywords: Coefficient of friction
Oxygen barrier
Pullulan
Mica
Nanocomposites
Issue Date: Sep-2017
Publisher: MDPI Multidisciplinary Digital Publishing Institute
Source: Uysal Ünalan, İ., Boyacı, D., Trabattoni, S., Tavazzi, S., and Farris, S. (2017). Transparent pullulan/mica nanocomposite coatings with outstanding oxygen barrier properties. Nanomaterials, 7(9). doi:10.3390/nano7090281
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.
URI: http://doi.org/10.3390/nano7090281
http://hdl.handle.net/11147/6709
ISSN: 2079-4991
Appears in Collections:Food Engineering / Gıda Mühendisliği
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Files in This Item:
File Description SizeFormat 
6709.pdfMakale2.28 MBAdobe PDFThumbnail
View/Open
Show full item record

CORE Recommender

SCOPUSTM   
Citations

4
checked on Oct 16, 2021

WEB OF SCIENCETM
Citations

6
checked on Oct 16, 2021

Page view(s)

24
checked on Oct 16, 2021

Download(s)

18
checked on Oct 16, 2021

Google ScholarTM

Check

Altmetric


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.