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    Permeation properties of a plasma-processed organosilicon–carboxymethylcellulose bilayer on fibrillated cellulosic films for sustainable packaging applications

    Year: 2023

    Journal: Cellulose, Volume 30, 2023-08-01

    Authors: Babaei, Sara; Profili, Jacopo; Al Rashidi, Mariam; Dorris, Annie; Beck, Stephanie; Asadollahi, Siavash; Sarkissian, Andranik; Stafford, Luc

    Keywords: Polymers; Atmospheric-pressure plasma treatment; Barrier coating; Cellulose; Sustainable packaging

    Cellulose, a sustainable and environmentally-friendly polymer derived from biomass, has shown great potential in many applications as an alternative to petroleum-based polymers. However, its hydrophilic nature limits its integration into packaging systems. This study aims to enhance the water-repellency of cellulose filament (CF) films by plasma deposition of an organosilicon (SiOCH) thin film. Water contact angle and Cobb test measurements reveal that the SiOCH coating deposited by non-thermal dielectric barrier discharge (DBD) at atmospheric pressure decreases the water absorbency of the substrate by about one order of magnitude, resulting in a highly hydrophobic CF film. However, the water vapour (WVTR) and oxygen transmission rates (OTR) of CF remain almost unchanged. Spray coating with 5% carboxymethylcellulose (CMC) sealer effectively decreases the WVTR and OTR of the CF film; however, the water absorbency is increased. Finally, the measurements conducted on a CF film sample coated with a bilayer of CMC/SiOCH reveal that the combined treatment reduces the WVTR and OTR of the film by 95% and 66%, respectively, and lowers the water absorbency by two orders of magnitude. The functionalization methods proposed herein provide an effective approach for the selective tuning of CF film permeation properties. It can be applied in the development of both, wet and dry, sustainable packaging materials.
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