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Ultra-thin parylene-aluminium hybrid coatings on nanocellulose films to resist water sensitivity
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Fiberteknologi.
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, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Fiberteknologi. RISE Research Institutes of Sweden, Material and Surface Design, SE-114 86, Stockholm, Sweden.ORCID-id: 0000-0002-0999-6671
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi, Fiberteknologi.ORCID-id: 0000-0002-7410-0333
Vise andre og tillknytning
2024 (engelsk)Inngår i: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 323, s. 121365-, artikkel-id 121365Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Elsevier BV , 2024. Vol. 323, s. 121365-, artikkel-id 121365
Emneord [en]
Aluminium, Cellulose nanofibrils, Coatings, Parylene, Vapour deposition, Water vapour barrier
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Identifikatorer
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
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QC 20231003

Tilgjengelig fra: 2023-10-03 Laget: 2023-10-03 Sist oppdatert: 2023-11-07bibliografisk kontrollert

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

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