Optical Properties and Mechanical Modeling of Acetylated Transparent Wood Composite Laminates
Optical Properties and Mechanical Modeling of Acetylated Transparent Wood Composite Laminates
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DOI：
10.3390/ma12142256
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发表时间：
2019-07-02
期刊：
影响因子：
3.4
通讯作者：
Srubar, Wil V., III
中科院分区：
文献类型：
--
作者：
Foster, Kyle E. O.;Hess, Kristen M.;Srubar, Wil V., III
透明木质复合材料是一种新型的木质透光材料，它是以脱木质素的木材为模板，在其表面渗透一种折射率匹配的高分子树脂。最近的研究主要集中在单层TWC的制造和表征。然而，多层复合材料层压件由于与单层相比它们赋予的机械优点而受到关注。在这项工作中，使用脱木质化木材模板（C）和乙酰化脱木质化木材模板（AC）制造1层和2层TWC层压材料。分别使用紫外-可见光谱（UV-Vis）和拉伸测试（5x重复）确定所得C和AC TWC层压体的光学和机械性能。此外，经典的层压板理论和简单的规则的混合物，预测多层拉伸模量和强度，分别从双水平的机械性能的能力进行了研究，并在此报告。实验结果突出了未改性和化学改性的TWC的机械和光学响应之间存在的权衡。与未改性的样品相比，模板乙酰化使0纤维方向上的刚度和强度分别降低了2.4 GPa和58.9 MPa。在高波长的光（>515 nm）下，AC样品表现出比C样品更高的透射率。在687 nm以上，2层AC样品表现出比1层C样品更高的透射率，表明可以通过改善的界面相互作用克服厚度依赖的光学约束。最后，两个预测模型都成功地预测了2层C和AC样品的弹性模量和拉伸强度响应。
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 [07901 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 (5x 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.