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Ultra-thin parylene-aluminium hybrid coatings on nanocellulose films to resist water sensitivity
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology.
Linköping University, Campus Norrköping, Laboratory of Organic Electronics, SE-602 21 Norrköping, Sweden; Central European Institute of Technology, Brno University of Technology, CZ-601 77 Brno, Czech Republic.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology. RISE Research Institutes of Sweden, Material and Surface Design, SE-114 86, Stockholm, Sweden.ORCID iD: 0000-0002-0999-6671
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology, Fibre Technology.ORCID iD: 0000-0002-7410-0333
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2024 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 323, p. 121365-, article id 121365Article in journal (Refereed) Published
Abstract [en]

Non-sustainable single-use plastics used for food packaging needs to be phased out. Films made from cellulose nanofibrils (CNFs) are suitable candidates for biodegradable and recyclable packaging materials as they exhibit good mechanical properties, excellent oxygen barrier properties and high transparency. Yet, their poor water vapour barrier properties have been a major hindrance in their commercialisation. Here, we describe the preparation of 25 μm thick CNF films with significantly improved water vapour barrier properties after deposition of ultrathin polymeric and metallic coatings, parylene C and aluminium, respectively. When first adding a 40 nm aluminium layer followed by an 80 nm parylene layer, i.e. with a combined thickness of less than one percent of the CNF film, a water vapour transmission rate of 2.8 g m−2 d−1 was achieved at 38 °C and 90 % RH, surpassing a 25 μm polypropylene film (4–12 g m−2 d−1). This is an improvement of more than 700 times compared to uncoated CNF films, under some of the harshest possible conditions a packaging material will need to endure in commercial use. The layers showed a good and even coverage, as assessed by atomic force microscopy, and the parylene-coated surfaces were hydrophobic with a contact angle of 110°, providing good water repellency.

Place, publisher, year, edition, pages
Elsevier BV , 2024. Vol. 323, p. 121365-, article id 121365
Keywords [en]
Aluminium, Cellulose nanofibrils, Coatings, Parylene, Vapour deposition, Water vapour barrier
National Category
Condensed Matter Physics Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-337409DOI: 10.1016/j.carbpol.2023.121365ISI: 001086726500001Scopus ID: 2-s2.0-85172102025OAI: oai:DiVA.org:kth-337409DiVA, id: diva2:1802078
Note

QC 20231003

Available from: 2023-10-03 Created: 2023-10-03 Last updated: 2023-11-07Bibliographically approved

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Sethi, JatinReid, Michael S.Larsson, Per A.Wågberg, Lars

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Sethi, JatinReid, Michael S.Larsson, Per A.Wågberg, Lars
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