香椿木材热处理前后物理力学性能和化学成分的变化。

IF 0.9 4区农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD

Wood Research Pub Date : 2020-12-16 DOI:10.37763/wr.1336-4561/65.6.877884

Jiulong Xie, Lin Chen, Huijuan Shao, Lu He, Yongze Jiang, L. Dan, Hui Xiao, Yuzhu Chen, Xingyan Huang, Jianfeng Hao, L. Tu, Tiantian Lin, Yin-long Xiao, Gang Chen, Jinqiu Qi

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引用次数: 0

摘要

本研究采用真空热处理来提高香椿木材的尺寸稳定性，并对热处理前后的收缩率、膨胀率、物理力学性能和化学成分进行了评价。结果表明，在220°C下热处理6h，木材样品的体积收缩率和膨胀率分别降低了45.60%和49.95%，表明热处理可以显著提高香椿木材的尺寸稳定性。热处理也降低了机械强度。处理后表面颜色发生了变化。化学成分结果表明，密度和机械强度的降低是由于处理过程中半纤维素的部分降解。本研究的结果表明，真空热处理可以通过牺牲一定的机械强度来提高尺寸稳定性，应适当控制处理条件（主要是温度），以在机械强度降低最小的情况下优化尺寸稳定性。

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Changes in physical-mechanical properties and chemical compositions of Toona sinensis wood before and after thermal treatment.

Vacuum heat treatment was used to improve the dimensional stability of Toona sinensis wood in this study, the shrinking and swelling rates, the physical-mechanical properties, and the chemical compositions before and after the thermal treatment were evaluated. The results revealed that the volume shrinkage and swelling rate for the heat-treated wood samples were decreased by 45.60% and 49.95%, respectively at 220°C for 6 h indicating that thermal treatment could obviously improve the dimensional stability of Toona sinensis wood. Thermal treatment also decreased the mechanical strength. The surface color was changed by the treatment. The chemical composition results showed the decrease in density and mechanical strength was due to the partial degradation of hemicellulose during the treatment. The results of this study that vacuum heat treatment could improve the dimensional stability by sacrificing somewhat mechanical strength, the treatment conditions mainly the temperature should be properly controlled to archive an optimized improvement in dimensional stability with minimum reduction in mechanical strength.

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来源期刊

Wood Research 工程技术-材料科学：纸与木材

CiteScore

2.40

自引率

15.40%

发文量

审稿时长

5.4 months

期刊介绍： Wood Research publishes original papers aimed at recent advances in all branches of wood science (biology, chemistry, wood physics and mechanics, mechanical and chemical processing etc.). Submission of the manuscript implies that it has not been published before and it is not under consideration for publication elsewhere.