通过纤维素纳米晶体浸渍将木材转化为高性能工程材料

D. Bajwa, Ismat Ara, Ashton Oriel Chan, S. Bajwa, Kerry E. Hartman
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引用次数: 0

摘要

建筑业对木材的需求导致强木质木材的短缺,导致人们转而使用混凝土和非生物降解材料等成本更高的替代品,这促使人们研究如何改良软木以获得更好的工程特性。本研究调查了利用功能化纤维素纳米晶体(f-CNCs)提高软木性能的多步浸渍工艺的优化情况。该工艺包括碱脱木质素、超声波处理和真空压力处理,以提高木材的孔隙率,进而改善 CNC 的均匀分散浸渍。通过场发射扫描电子显微镜和原子力显微镜(AFM)进行的微观结构分析可详细了解细胞壁形态和表面形貌,而傅立叶变换红外光谱则突出显示了 f-CNC 浸渍造成的成分变化。机械测试表明,经处理的木材有明显改善,特别是 2% CNC 处理组的弹性模量比对照组提高了 67%;2% CNC、3% NaOH 和 2% 乙酸处理组的断裂模数比对照组提高了 71%。使用 3% NaOH 脱木素并浸渍 2% f-CNC 的样品效果尤为显著。这项研究为使用 CNC 强化软木的潜在进步奠定了基础,包括新型 AFM 方法和替代浸渍技术(如 Lowry 方法),值得进一步探索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Transforming Wood into a High-Performance Engineering Material via Cellulose Nanocrystal Impregnation
The demand for wood in construction has led to shortages of strong wood types, causing a shift to costlier alternatives like concrete and nonbiodegradable materials, prompting the investigation of modifying softwoods for better engineering properties. This study investigates the optimization of a multistep impregnation process utilizing functionalized cellulose nanocrystals (f-CNCs) to enhance softwood properties. The process involves alkali delignification, ultrasonication, and vacuum pressure treatment to improve wood porosity and in turn improve CNC impregnation with uniform dispersion. Microstructural analyses through field emission scanning electron microscopy and atomic force microscopy (AFM) offer detailed insights into cell wall morphology and surface topography, whereas Fourier transform infrared spectroscopy highlights compositional shifts resulting from f-CNC impregnation. Mechanical testing demonstrates significant improvements for treated woods, particularly a 67 percent increase in modulus of elasticity for the 2 percent CNC-treated group compared with the control group; a 71 percent increase in modulus of rupture was observed for 2 percent CNC-, 3 percent NaOH-, and 2 percent acetic acid-treated group compared with the control sample. The sample delignified with 3 percent NaOH and impregnated by 2 percent f-CNC emerged as particularly effective. This research sets the stage for potential advancements in strengthening softwood using CNC, including a novel AFM method and alternative impregnation techniques like the Lowry method, inviting further exploration.
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