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Mechanically Reinforced, Flexible, Hydrophobic and UV Impermeable Starch-Cellulose Nanofibers (CNF)-Lignin Composites with Good Barrier and Thermal Properties
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. Zhejiang Ocean Univ, Sch Food & Pharm, Zhoushan 316022, Peoples R China.;Ocean TuniCell AS, POB 12, N-5868 Blomsterdalen, Norway..ORCID iD: 0000-0001-8208-4938
Ocean TuniCell AS, POB 12, N-5868 Blomsterdalen, Norway..
Ocean TuniCell AS, POB 12, N-5868 Blomsterdalen, Norway..
Ocean TuniCell AS, POB 12, N-5868 Blomsterdalen, Norway.;Univ Bergen, Dept Biol Sci, N-5006 Bergen, Norway..
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2021 (English)In: Polymers, E-ISSN 2073-4360, Vol. 13, no 24, p. 4346-, article id 4346Article in journal (Refereed) Published
Abstract [en]

Bio-based composite films have been widely studied as potential substitutes for conventional plastics in food packaging. The aim of this study was to develop multifunctional composite films by introducing cellulose nanofibers (CNF) and lignin into starch-based films. Instead of costly and complicated chemical modification or covalent coupling, this study optimized the performance of the composite films by simply tuning the formulation. We found that starch films were mechanically reinforced by CNF, with lignin dispersing as nanoparticles embedded in the matrix. The newly built-up hydrogen bonding between these three components improves the integration of the films, while the introduction of CNF and lignin improved the thermal stability of the starch-based films. Lignin, as a functional additive, improved hydrophobicity and blocked UV transmission. The inherent barrier property of CNF and the dense starch matrix provided the composite films with good gas barrier properties. The prepared flexible films were optically transparent, and exhibited UV blocking ability, good oxygen-barrier properties, high hydrophobicity, appreciable mechanical strength and good thermal stability. These characteristics indicate potential utilization as a green alternative to synthetic plastics especially for food packaging applications.

Place, publisher, year, edition, pages
MDPI AG , 2021. Vol. 13, no 24, p. 4346-, article id 4346
Keywords [en]
cellulose nanofibers, starch, lignin, composite film, high performance
National Category
Paper, Pulp and Fiber Technology Bio Materials Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-307131DOI: 10.3390/polym13244346ISI: 000737347800001PubMedID: 34960897Scopus ID: 2-s2.0-85121290823OAI: oai:DiVA.org:kth-307131DiVA, id: diva2:1630022
Note

QC 20220119

Available from: 2022-01-19 Created: 2022-01-19 Last updated: 2024-01-17Bibliographically approved

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Zhao, Yadong

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