Isolation of lignocellulose nanofibrils (LCNF) and application as adhesive replacement in wood composites: example of fiberboard

Thermomechanical pulp (TMP) produced using atmospheric refining was ground to isolate lignocellulose nanofibrils (LCNF). Forty minutes and a specific energy of about 1300 kWh/t were necessary to reach the end-point of the process defined by the presence of 95% fines in the slurry. 100% fines were re...

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Bibliographic Details
Published in:Cellulose (London) 2017-07, Vol.24 (7), p.3037-3050
Main Authors: Diop, Cherif Ibrahima Khalil, Tajvidi, Mehdi, Bilodeau, Michael A., Bousfield, Douglas W., Hunt, John F.
Format: Article
Language:English
Subjects:
Adhesion tests
Binding energy
Bioorganic Chemistry
Cellulose fibers
Ceramics
Chemistry
Chemistry and Materials Science
Composite materials
Composites
Fiberboard
Glass
Lignin
Lignocellulose
Mechanical properties
Modulus of elasticity
Modulus of rupture
Nanostructure
Natural Materials
Organic Chemistry
Original Paper
Panels
Physical Chemistry
Polymer Sciences
Similarity
Slurries
Sustainable Development
Thermal stability
Wood composites
Wood products
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Summary:Thermomechanical pulp (TMP) produced using atmospheric refining was ground to isolate lignocellulose nanofibrils (LCNF). Forty minutes and a specific energy of about 1300 kWh/t were necessary to reach the end-point of the process defined by the presence of 95% fines in the slurry. 100% fines were reached after 90 min and 5800 kWh/t. The similarity in structure between pilot-scale produced reference cellulose nanofibrils (CNF) and LCNF with an average fibril diameter of 12 nm confirmed the negligible effect of residual lignin on the defibrillation process. The thermal stability of LCNF was found to be 30 °C lower compared to that of CNF due to the lignin influence, but it was in the range of processing temperatures used for wood composite materials. The effect of using LCNF as adhesive replacement in fiberboard has been assessed. A maximum modulus of rupture of 12.1 MPa comparable to that of commercial fiberboards and high modulus of elasticity, was obtained at 20% LCNF content for panels produced at 180 °C. The binding ability of LCNF and its effect on the mechanical properties of fiberboards were more perceptible when a less refined TMP with lower fine content and longer fibers was used in the process.
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-017-1320-z