University of Oulu

Sethi, J., Farooq, M., Österberg, M., Illikainen, M., Sirviö, J. (2018) Stereoselectively water resistant hybrid nanopapers prepared by cellulose nanofibers and water-based polyurethane. Carbohydrate Polymers, 199, 286-293. doi:10.1016/j.carbpol.2018.07.028

Stereoselectively water resistant hybrid nanopapers prepared by cellulose nanofibers and water-based polyurethane

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Author: Sethi, Jatin1; Farooq, Muhammad2; Österberg, Monika2;
Organizations: 1Fibre and Particle Engineering, University of Oulu, Oulu, Finland
2Department of Bioproducts and Biosystems, Aalto University, Helsinki, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.4 MB)
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Language: English
Published: Elsevier, 2018
Publish Date: 2019-07-10


Cellulose nanopapers, known for excellent mechanical properties, loses 90% of their stiffness in the wet conditions. In this study, we attempt to improve the wet mechanical properties of cellulose nanopaper by incorporating polyurethane by a novel and ecofriendly method. Water based PU was dispersed along with CNFs in water and hybrid nanopapers were prepared by draining water under vacuum followed by forced drying. These hybrid nanopapers have a gradient interpenetrating structure with PU concentrated towards one side and CNFs towards the other, which was confirmed by scanning electron microscopy, x-ray photoelectron spectroscopy and contact angle measurements. Because of this, the nanopapers are water resistant on one surface (PU rich side) and hydrophilic on the other (cellulose rich side), making them stereoselectively water resistant. When wetted with water on the PU side, the hybrid nanopaper with 10% PU is able to retain 65% modulus; on the other hand, the reference retains only 10% of the modulus. Similar results are seen in the tensile and the yield strength. Additionally, the hybrid nanopapers have higher elongation and improved thermal stability. The reported material is relevant to the applications such as flexible electronics and transparent displays.

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Series: Carbohydrate polymers
ISSN: 0144-8617
ISSN-E: 1879-1344
ISSN-L: 0144-8617
Volume: 199
Pages: 286 - 293
DOI: 10.1016/j.carbpol.2018.07.028
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
216 Materials engineering
215 Chemical engineering
Funding: This research did not receive any specific grant from funding agencies in the public, commercial or non-profit sectors.
Dataset Reference: Supplementary data:
Copyright information: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license