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The fluorine-free coating has excellent hydrophobic and oleophobic properties for porous cellulose-based materials

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Abstract

Nanofibrillated cellulose is obtained from cellulose resources (e.g., Natural cellulose, bacterial cellulose) and is deemed to be environmentally friendly, green, and inexhaustible. Accordingly, we reported an innovative method for fluorine-free water- and oil/grease-repellent surface based on porous cellulose-based materials. In order to improve oil/grease resistance, sulfonated nanofibrillated cellulose (SNFC) was coated on the surface to fill the porous, the obtained paper was soaked in chitosan aqueous solution as the second layer. The-SNFC-chitosan-coated paper was applied with modified polyvinyl alcohol (MPVA) as the third layer to increase water resistance and water vapour transmittance. The experimental results showed 5.2 g/m2 SNFC, 2.5 g/m2 chitosan and 7% MPVA demonstrated excellent kit rating value of 12/12 (maximum grease resistance) (oil resistance contact angle is 103.93°), good water resistance (water contact angle is 108.6°) and high water vapour transmission rate (4.8 × 10–14 g cm/cm2 s Pa) under the condition of 90% relative humidity. This non-fluorinated and practical method is an excellent alternative to existing fluorinated materials, which will further promote the development of cellulose-based packaging.

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Acknowledgments

The Project Supported by the Foundation (No. ZZ20200107) of State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences and the Guangdong Basic and Applied Basic Research Foundation (2019A1515110708) and the National Natural Science Foundation of China (31670590) and the Science and Technology Projects of Shandong Province (ZR201702220356).

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All authors contributed as the main contributors of this work. All authors performed the literature search and analysis: all authors had drafted, revised the work and approved the final paper.

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Correspondence to Qijun Ding or Chuanshan Zhao.

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Du, P., Ding, Q., Zhao, C. et al. The fluorine-free coating has excellent hydrophobic and oleophobic properties for porous cellulose-based materials. Cellulose 28, 6133–6146 (2021). https://doi.org/10.1007/s10570-021-03959-8

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  • DOI: https://doi.org/10.1007/s10570-021-03959-8

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