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    Author(s): Jen-Chieh Liu; Robert J. MoonAlan Rudie; Jeffrey P. Youngblood
    Date: 2014
    Source: Holzforschung 2014; Volume 68, Number 3, 2014; pp. 283–290.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (2.28 MB)


    Homogeneous and transparent CNF films, fabricated from the (2,2,6,6- tetramethylpiperidin-1-yl) oxyl (TEMPO)-modified CNF suspension, were laminated onto wood flakes (WF) based on phenol-formaldehyde (PF) resin and the reinforcement potential of the material has been investigated. The focus was on the influence of CNF film lamination, relative humidity (RH), heat treatment, and anisotropic properties of WF on the CNF-WF laminate tensile properties (elastic modulus, ultimate tensile strength, strain to failure). Results demonstrated that CNFWF laminates had improved mechanical performance as compared to the neat WF. In the WF transverse direction, there were gains of nearly 200% in Young’s modulus and 300% in ultimate tensile strength. However, in the WF axial direction, the reinforcement effect was minor after PF modification of the wood and the presence of the CNF layers. The effective elastic moduli of the CNF-WF laminates were calculated based on the laminated plate theory, and the calculation in both axial and transverse directions were in agreement with the experimental results.

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    Liu, Jen-Chieh; Moon, Robert J.; Rudie, Alan; Youngblood, Jeffrey P. 2014. Mechanical performance of cellulose nanofibril film-wood flake laminate. Holzforschung 2014; Volume 68, Number 3, 2014; pp. 283–290.


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    cellulose nanofibrils, laminate, phenol-formaldehyde resin, relative humidity, wood flake

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