Multilayer Film Comprising Polybutylene Adipate Terephthalate and Cellulose Nanocrystals with High Barrier and Compostable Properties
2024
Meléndez-Rodríguez, Beatriz | Prieto López, Cristina | Pardo Figuérez, María | Angulo, Inmaculada | Bourbon, Ana I. | Amado, Isabel R. | Cerqueira, Miguel A. | Pastrana, Lorenzo M. | Hilliou, Loic Hugues Gilles | Vicente, António A. | Cabedo, Luis | Lagarón Cabello, José María | European Commission | Ministerio de Ciencia, Innovación y Universidades (España) | Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
In the present study, a multilayer, high-barrier, thin blown film based on a polybutylene adipate terephthalate (PBAT) blend with polyhydroxyalkanoate (PHA), and composed of four layers including a cellulose nanocrystal (CNC) barrier layer and an electrospun poly(3-hydroxybutyrateco- 3-hydroxyvalerate) (PHBV) hot-tack layer, was characterized in terms of the surface roughness, surface tension, migration, mechanical and peel performance, barrier properties, and disintegration rate. The results showed that the film exhibited a smooth surface. The overall migration tests showed that the material is suitable to be used as a food contact layer. The addition of the CNC interlayer had a significant effect on the mechanical properties of the system, drastically reducing the elongation at break and, thus, the flexibility of the material. The film containing CNCs and electrospun PHBV hot-tack interlayers exhibited firm but not strong adhesion. However, the multilayer was a good barrier to water vapor (2.4 ± 0.1 × 10−12 kg·m−2·s−1·Pa−1), and especially to oxygen (0.5 ± 0.3 × 10−15 m3·m−2·s−1·Pa−1), the permeance of which was reduced by up to 90% when the CNC layer was added. The multilayer system disintegrated completely in 60 days. All in all, the multilayer system developed resulted in a fully compostable structure with significant potential for use in high-barrier food packaging applications
Show more [+] Less [-]This research work was funded by the H2020 EU project YPACK (reference number 773872) and by the Spanish Ministry of Science Innovation and Universities (MCIU), project PID2021-128749OB-C31
Show more [+] Less [-]Peer reviewed
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