University of Oulu

Juho Antti Sirviö and Miikka Visanko, Biomacromolecules 2019 20 (6), 2413-2420, DOI: 10.1021/acs.biomac.9b00427

Highly transparent nanocomposites based on poly(vinyl alcohol) and sulfated UV-absorbing wood nanofibers

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Author: Sirviö, Juho Antti1; Visanko, Miikka1
Organizations: 1Fibre and Particle Engineering Research Unit, University of Oulu, P.O. Box 4300, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 6.7 MB)
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Language: English
Published: American Chemical Society, 2019
Publish Date: 2019-06-24


Unbleached lignocellulose fibers were studied for the fabrication of wood-based UV-absorbing nanofibers and were used to produce transparent nanocomposites. Groundwood pulp (GWP) and sawdust were selected as raw materials thanks to their low processing degree of fibers and abundant availability as a low-value industrial side stream. Both materials were first sulfated using a reactive deep eutectic solvent. The sulfated wood and sawdust nanofibers (SWNFs and SSDNFs, respectively) were fabricated using a mild mechanical disintegration approach. As a reference material, sulfated cellulose nanofibers (SCNFs) were obtained from bleached cellulose pulp. Our results showed that both GWP and sawdust exhibited similar reactivity compared with bleached cellulose pulp, whereas the yields of sulfated lignin-containing pulps were notably higher. The diameters of both SWNFs and SSDNFs were approximately 3 nm, which was similar to those of the SCNFs. When 10 wt % of lignin-containing nanofibers were mixed together with poly(vinyl alcohol), the fabrication of nanocomposites with only a minimal decrease in transparency in the visible light spectrum was achieved. Transmission in the UV region, on the other hand, was significantly reduced by SWNFs and SSDNFs, whereas SCNFs had only a minor UV-absorbing property. Although the reinforcing effect of lignin-containing nanofibers was lower compared with that of SCNFs, it was comparable with those of other UV-absorbing additives reported in the literature. Overall, the wood-based UV-absorbing nanofibers could have a valuable use in optical applications such as lenses and optoelectronics.

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Series: Biomacromolecules
ISSN: 1525-7797
ISSN-E: 1526-4602
ISSN-L: 1525-7797
Volume: 20
Issue: 6
Pages: 2413 - 2420
DOI: 10.1021/acs.biomac.9b00427
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
Funding: The research was conducted as part of the ARVOPURU project funded by the Council of Oulu Region, which was granted by the European Regional Development Fund of the European Union.
Copyright information: © 2019 American Chemical Society. This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.