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Optical Properties and Mechanical Modeling of Acetylated Transparent Wood Composite Laminates

1
Materials Science and Engineering Program, University of Colorado Boulder, UCB 596, Boulder, CO 80309-0596, USA
2
Department of Civil, Environmental, and Architectural Engineering, University of Colorado Boulder, ECOT 441 UCB 428, Boulder, CO 80309-0428, USA
3
Department of Chemistry, Colorado State University, Center Ave, Fort Collins, CO 80523, USA
*
Author to whom correspondence should be addressed.
Materials 2019, 12(14), 2256; https://doi.org/10.3390/ma12142256
Received: 9 June 2019 / Revised: 25 June 2019 / Accepted: 11 July 2019 / Published: 13 July 2019
(This article belongs to the Special Issue New and Emerging Construction Materials)
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Abstract

Transparent wood composites (TWCs) are a new class of light-transmitting wood-based materials composed of a delignified wood template that is infiltrated with a refractive- index-matched polymer resin. Recent research has focused primarily on the fabrication and characterization of single-ply TWCs. However, multi-ply composite laminates are of interest due to the mechanical advantages they impart compared to the single ply. In this work, 1- and 2-ply [0°/90°] TWC laminates were fabricated using a delignified wood template (C) and an acetylated delignified wood template (AC). The optical and mechanical properties of resultant C and AC TWC laminates were determined using ultraviolet-visible spectroscopy (UV-Vis) and tensile testing (5× replicates), respectively. In addition, the ability of classical lamination plate theory and simple rule of mixtures to predict multi-ply tensile modulus and strength, respectively, from ply-level mechanical properties were investigated and are reported herein. Experimental results highlight tradeoffs that exist between the mechanical and optical responses of both unmodified and chemically modified TWCs. Template acetylation reduced the stiffness and strength in the 0° fiber direction by 2.4 GPa and 58.9 MPa, respectively, compared to the unmodified samples. At high wavelengths of light (>515 nm), AC samples exhibited higher transmittance than the C samples. Above 687 nm, the 2-ply AC sample exhibited a higher transmittance than the 1-ply C sample, indicating that thickness-dependent optical constraints can be overcome with improved interfacial interactions. Finally, both predictive models were successful in predicting the elastic modulus and tensile strength response for the 2-ply C and AC samples. View Full-Text
Keywords: transparent wood; laminates; interfacial modification; acetylation; mechanical modeling transparent wood; laminates; interfacial modification; acetylation; mechanical modeling
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Foster, K.E.O.; Hess, K.M.; Miyake, G.M.; Srubar, W.V., III. Optical Properties and Mechanical Modeling of Acetylated Transparent Wood Composite Laminates. Materials 2019, 12, 2256.

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