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| Azevedo, Nuno Monteiro |
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Almeida, Giana
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Topics
Publications (10/10 displayed)
- 2024Water vapor transport properties of bio-based multilayer materials determined by original and complementary methodscitations
- 2023Resilient high oxygen barrier multilayer films of nanocellulose and polylactidecitations
- 2022Gas barrier properties of polylactide/cellulose nanocrystals nanocompositescitations
- 2020TransPoly: A theoretical model to quantify the dynamics of water transfer through nanostructured polymer filmscitations
- 2020New insulating and refractory mineral foam: Structure and mechanical propertiescitations
- 2020In situ measurements of viscoelastic properties of biomass during hydrothermal treatment to assess the kinetics of chemical alterationscitations
- 2019Nanocellulose-based composites: surface modification, processing and properties
- 2018Assessment of biomass alterations during hydrothermal pretreatment by in-situ dynamic mechanical analysiscitations
- 2018Designed cellulose nanocrystal surface properties for improving barrier properties in polylactide nanocompositescitations
- 2012Torrefaction Of Cellulose: Validity And Limitation Of The Temperature/Duration Equivalence
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article
Resilient high oxygen barrier multilayer films of nanocellulose and polylactide
Abstract
Nanocelluloses are promising high gas barrier materials for biobased food packaging, but they must be protected from water to preserve high performance. The respective O2 barrier properties of different types of nanocelluloses were compared (nanofibers (CNF), oxidized nanofibers (CNF TEMPO) and nanocrystals (CNC)). The oxygen barrier performance for all types of nanocelluloses was similarly high. To protect the nanocellulose films from water, a multilayer material architecture was used with poly(lactide) (PLA) on the outside. To achieve this, a biobased tie layer was developed, using Corona treatment and chitosan. This allowed thin film coating with nanocellulose layers between 60 and 440 nm thickness. AFM images treated with Fast Fourier Transform showed the formation of locally-oriented CNC layers on the film. Coated PLA(CNC) films performed better (3.2 × 10−20 m3.m/m2.s.Pa) than PLA(CNF) and PLA(CNF TEMPO) (1.1 × 10−19 at best), because thicker layers could be obtained. The oxygen barrier properties were constant during successive measurements at 0 % RH, 80 % RH and again at 0 % RH. This shows that PLA is sufficiently shielding nanocelluloses from water uptake to keep high performance in an extended range of RH and opens the way to high oxygen barrier films which are biobased and biodegradable.