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Large Scale Self-Assembly of Smectic Nanocomposite Films by Doctor Blading versus Spray Coating : Impact of Crystal Quality on Barrier Properties

Title data

Tsurko, Evgeny ; Feicht, Patrick ; Nehm, Frederik ; Ament, Kevin ; Rosenfeldt, Sabine ; Pietsch, Ines ; Roschmann, Konrad ; Kalo, Hussein ; Breu, Josef:
Large Scale Self-Assembly of Smectic Nanocomposite Films by Doctor Blading versus Spray Coating : Impact of Crystal Quality on Barrier Properties.
In: Macromolecules. Vol. 50 (May 2017) Issue 11 . - pp. 4344-4350.
ISSN 1520-5835
DOI: https://doi.org/10.1021/acs.macromol.7b00701

Official URL: Volltext

Abstract in another language

Flexible transparent barrier films are required in various fields of application ranging from flexible, transparent food packaging to display encapsulation. Environmentally friendly, waterborne polymer–clay nanocomposites would be preferred but fail to meet in particular requirements for ultra high water vapor barriers. Here we show that self-assembly of nanocomposite films into one-dimensional crystalline (smectic) polymer–clay domains is a so-far overlooked key-factor capable of suppressing water vapor diffusivity despite appreciable swelling at elevated temperatures and relative humidity (R.H.). Moreover, barrier performance was shown to improve with quality of the crystalline order. In this respect, spray coating is superior to doctor blading because it yields significantly better ordered structures. For spray-coated waterborne nanocomposite films (21.4 μm) ultra high barrier specifications are met at 23 °C and 50% R.H. with oxygen transmission rates (OTR) < 0.0005 cm3 m–2 day–1 bar–1 and water vapor transmissions rates (WVTR) of 0.0007 g m–2 day–1. Even in the most challenging environments (38 °C and 90% R.H.), values as low as 0.24 cm3 m–2 day–1 bar–1 and 0.003 g m–2 day–1 were found for OTR and WVTR, respectively.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Anorganic Chemistry I > Chair Anorganic Chemistry I - Univ.-Prof. Dr. Josef Breu
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie
Research Institutions > Collaborative Research Centers, Research Unit > SFB 840 Von partikulären Nanosystemen zur Mesotechnologie > SFB 840 - TP B 3
Research Institutions
Research Institutions > Collaborative Research Centers, Research Unit
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 29 Mar 2018 07:33
Last Modified: 29 Mar 2018 07:33
URI: https://eref.uni-bayreuth.de/id/eprint/43101