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Polymers 2017, 9(9), 425; https://doi.org/10.3390/polym9090425

Simple Green Route to Performance Improvement of Fully Bio-Based Linseed Oil Coating Using Nanofibrillated Cellulose

1
Department of Material Sciences and Process Engineering, BOKU—University of Natural Resources and Life Sciences, Vienna, Konrad Lorenz Straße 24, 3430 Tulln, Austria
2
Holzforschung Austria, Franz Grill Straße 7, 1030 Vienna, Austria
3
Kompetenzzentrum Holz GmbH, Altenberger Straße 69, 4040 Linz, Austria
4
Department of Chemistry, BOKU—University of Natural Resources and Life Sciences, Vienna, Konrad Lorenz Straße 24, 3430 Tulln, Austria
5
Applied Wood Materials Laboratory, EMPA—Swiss Federal Laboratories for Materials Science and Technology, Überlandstraße 129, 8600 Dübendorf, Switzerland
*
Author to whom correspondence should be addressed.
Received: 28 July 2017 / Revised: 29 August 2017 / Accepted: 3 September 2017 / Published: 7 September 2017
(This article belongs to the Special Issue Cellulose Nanomaterials)
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Abstract

Due to their bio-based character, oil-based coatings become more and more prevalent in wood surface finishing. These coatings impart appealing optical and haptic properties to the wood surface, but lack sufficient protection against water and mechanical influences. The present study reports a simple green route to improve the performance of linseed oil coating by the addition of nanofibrillated cellulose (NFC). In order to achieve surface chemical compatibility with linseed oil, NFC was chemically modified with acetic anhydride and (2-dodecen-1-yl)succinic anhydride, respectively, using propylene carbonate as a solvent. NFC/linseed oil formulations were prepared and applied to wood substrates. The wear resistance of oil-coated wood surfaces was assessed by a newly developed test combining abrasive loading with subsequent contact angle measurement. As revealed by infrared and nuclear magnetic resonance (NMR) spectroscopy, as well as X-ray diffraction (XRD), NFC has been successfully modified without significantly affecting the structure of cellulose. In abrasion tests, all NFC-modified oil coatings performed better than the original oil. Interestingly, NFC only suspended in propylene carbonate, i.e., without chemical modification, had the strongest improvement effect on the coating’s wear resistance. This was primarily attributed to the loose network structure of this NFC variant which effectively prevents the oil from penetration into the wood surface, thus forming a protective NFC/oil composite layer on the wood surface. View Full-Text
Keywords: wood coating; linseed oil; nanocellulose; surface modification; wear resistance wood coating; linseed oil; nanocellulose; surface modification; wear resistance
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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).
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Veigel, S.; Lems, E.-M.; Grüll, G.; Hansmann, C.; Rosenau, T.; Zimmermann, T.; Gindl-Altmutter, W. Simple Green Route to Performance Improvement of Fully Bio-Based Linseed Oil Coating Using Nanofibrillated Cellulose. Polymers 2017, 9, 425.

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