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Pine Cone Biorefinery: Integral Valorization of Residual Biomass into Lignocellulose Nanofibrils (LCNF)-Reinforced Composites for Packaging
KTH Royal Institute of Technology, Sweden.
KTH Royal Institute of Technology, Sweden.
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design. KTH Royal Institute of Technology, Sweden: SLU Swedish University of Agricultural Sciences, Sweden.
2021 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485, Vol. 9, no 5, p. 2180-2190Article in journal (Refereed) Published
Abstract [en]

Presented herein is the integral valorization of residual biomass to film composites by their fractionation into building blocks in a multicomponent cascade isolation approach. First, pine cones were subjected to alkaline pretreatment, followed by soda pulping. Two different hemicellulose/lignin-based fractions were recovered from the extractives of these treatments, with a yield of 19%. Then, chloride- and peroxide-based bleaching methods were proposed to treat the soda-pulped samples, obtaining two cellulose-rich fractions with different chemical compositions and recovery yields (32% and 44%, respectively). From these cellulose fractions, two types of nanocelluloses with different lignin contents were obtained: cellulose nanofibrils (CNF), with a lignin content of 1%, and lignocellulose nanofibrils (LCNF), with a lignin content of 16%. The LCNF displayed lower crystallinity and viscosity but greater diameter and thermal stability than the CNF. The reinforcing capability of different amounts of both nanocelluloses on the first hemicellulose/lignin-based fraction (PCA-L) to form films was evaluated. The thermomechanical, barrier, antioxidant, moisture sorption, and mechanical properties were assessed and compared. In general, the LCNF films showed less moisture sorption and better thermomechanical and antioxidant properties than the CNF films. These results reveal LCNF to be a promising reinforcing agent for designing all-lignocellulose-based composite films to be used in food packaging applications. 

Place, publisher, year, edition, pages
American Chemical Society , 2021. Vol. 9, no 5, p. 2180-2190
Keywords [en]
Biobased nanocomposites, Biomass integral fractionization, Food packaging films, Gas barrier properties, Nanocelluloses, Thermomechanical properties, Alkalinity, Antioxidants, Cellulose nanocrystals, Chlorine compounds, Composite films, Composite structures, Crystallinity, Lignin, Moisture, Molecular biology, Nanocellulose, Nanofibers, Reinforcement, Alkaline pretreatment, Antioxidant properties, Cellulose fraction, Cellulose nanofibrils, Chemical compositions, Moisture sorption, Reinforced composites, Thermo-mechanical, Cellulose
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-52497DOI: 10.1021/acssuschemeng.0c07687Scopus ID: 2-s2.0-85100778184OAI: oai:DiVA.org:ri-52497DiVA, id: diva2:1532527
Note

Funding text 1: This research was supported by ÅForsk, Project 18-316.

Available from: 2021-03-02 Created: 2021-03-02 Last updated: 2022-05-11Bibliographically approved

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