不同预处理和致密化桦木的机械性能与化学变异性的关系

IF 7.1 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Matthias Jakob, Jan Janesch, Ulrich Müller, Wolfgang Gindl-Altmutter
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引用次数: 0

摘要

桦木单板试样在浓度、温度和持续时间等方面受到不同程度的碱性木质素分解,导致质量损失高达 50%。在致密化后,木材的机械性能得到了显著改善,超出了密度增加时的预期比例。在 50 GPa(弹性模量)和 450 MPa(拉伸强度)的数值下,弹性模量增加了 2 倍多,强度大约增加了两倍。机械性能首先随着质量损失的增加而提高,在中间水平达到峰值,然后再次降低。傅立叶变换红外光谱(FT-IR)显示,最初的质量损失主要与半纤维素的去除有关,而随着质量损失的增加,木质素的条带也受到影响。显示预处理引起的变化的红外波段与相应木材试样的力学性能之间的相关性分析表明,与纤维素和木质素相关的波段呈正相关,而与半纤维素相关的波段则与力学性能呈负相关。总的来说,71% 的力学性能变化是由红外光谱解释的。在本研究对桦木进行碱性处理的背景下,得出的结论是,在非常温和的碱性提取条件下,最初去除半纤维素对试样的力学性能有积极影响。通过更严格的处理逐步去除木质素成分并没有带来进一步的改善,但最终与未经处理的参照物相比,改善程度有所降低。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Mechanical Performance Related to Chemical Variability in Differently Pretreated and Densified Birch Wood

Mechanical Performance Related to Chemical Variability in Differently Pretreated and Densified Birch Wood
Birch wood veneer specimens were subjected to alkaline delignification with varying degrees of severity, in terms of concentration, temperature, and duration, resulting in up to 50% mass loss. Upon densification, substantial improvements in wood mechanical performance beyond the expected scaling with an increased density were obtained. With values of 50 GPa (elastic modulus) and 450 MPa (tensile strength), the elastic modulus increased by more than a factor of 2, and the strength roughly tripled. The mechanical performance first increased with increasing mass loss, peaked at intermediate levels, and then decreased again. Fourier-transform infrared (FT-IR) spectroscopy revealed that the initial mass loss was primarily related to the removal of hemicellulose, while with increasing mass loss, bands assigned to lignin were also affected. A correlation analysis between IR bands showing changes due to pretreatment and the mechanical performance of the respective wood specimens showed positive correlations for bands associated with cellulose and lignin, whereas bands assigned to hemicellulose showed a negative correlation with mechanics. In total, 71% of the variability of the mechanical performance was explained by IR spectra. Within the setting of the present study dealing with alkaline treatment of birch wood, it is concluded that the initial removal of hemicellulose under very mild alkaline extraction conditions had a positive effect on the mechanical performance of specimens. The progressive removal of lignin components with more severe treatment did not lead to further improvements but ultimately led to reduced improvements compared to the untreated reference.
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来源期刊
ACS Sustainable Chemistry & Engineering
ACS Sustainable Chemistry & Engineering CHEMISTRY, MULTIDISCIPLINARY-ENGINEERING, CHEMICAL
CiteScore
13.80
自引率
4.80%
发文量
1470
审稿时长
1.7 months
期刊介绍: ACS Sustainable Chemistry & Engineering is a prestigious weekly peer-reviewed scientific journal published by the American Chemical Society. Dedicated to advancing the principles of green chemistry and green engineering, it covers a wide array of research topics including green chemistry, green engineering, biomass, alternative energy, and life cycle assessment. The journal welcomes submissions in various formats, including Letters, Articles, Features, and Perspectives (Reviews), that address the challenges of sustainability in the chemical enterprise and contribute to the advancement of sustainable practices. Join us in shaping the future of sustainable chemistry and engineering.
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