Abstract
Recyclable cellulose nanofibril (CNF) and lignin-containing cellulose nanofibril (LCNF) coated wood flour composites were fabricated using a vacuum-filtration process for food serving applications. The coated cellulose nanofibril composites had excellent mechanical, and oil, and grease barrier properties compared to a commercial container. However, the composites with both LCNF and CNF coating layers had poor performance in wet conditions compared to the commercial container. The addition of 1 wt.% aluminum sulfate (alum) to the CNF and LCNF coating layer significantly improved the water-resistance of the composites. CNF + 1% alum coated composites had inferior water resistance and lower mechanical strength in wet conditions compared to the commercial container. However, the LCNF + 1% alum coated composites had comparable water resistance and higher wet mechanical properties than the commercial container. The recyclability of the composites was assessed through the disintegration of the samples in water and subsequent reformation, and it was found that the composites were fully recyclable. The composites could fully retain their mechanical and excellent oil and grease barrier properties after each recycling level. These recyclable fully bio-based nanocomposites can be an eco-friendly alternative for currently used food container systems that use harmful chemicals.
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Abbreviations
- CNF:
-
Cellulose nanofibril
- LCNF:
-
Lignin-containing cellulose nanofibril
- LDPE:
-
Low-density polyethylene
- PLA:
-
Polylactic acid
- PFA:
-
Per or poly-fluoroalkyl
- AKD:
-
Alkyl ketene dimer
- BKP:
-
Bleached kraft pulp
- UBKP:
-
Unbleached kraft pulp
- OCC:
-
Old corrugated container
- SFE:
-
Surface free energy
- SEM:
-
Scanning electron microscope
- EDS:
-
Energy-dispersive X-ray spectroscopy
- FTIR:
-
Fourier transform infrared spectroscopy
- ATR:
-
Attenuated total reflectance
- MOE:
-
Modulus of elasticity
- MOR:
-
Modulus of rupture
- MRT:
-
Modulus retention term
- ANOVA:
-
Analysis of variance
- DMRT:
-
Duncan’s multiple range test
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This work was supported by USDA Agricultural Research Service (ARS) [Project # 58–0204-6–003].
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Hossain, R., Tajvidi, M., Bousfield, D. et al. Recyclable grease-proof cellulose nanocomposites with enhanced water resistance for food serving applications. Cellulose 29, 5623–5643 (2022). https://doi.org/10.1007/s10570-022-04608-4
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DOI: https://doi.org/10.1007/s10570-022-04608-4