Adding gaseous ammonia with heat treatment to improve the mechanical properties of spruce wood

IF 2.2 3区 农林科学 Q2 FORESTRY Holzforschung Pub Date : 2023-04-17 DOI:10.1515/hf-2022-0179
Yiqin Gao, Li Li, Yao Chen
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Abstract

Abstract Degradation of the mechanical properties of heat-treated wood is a significant problem that needs to be addressed. This study aimed to stabilize the mechanical strength of heat-treated spruce wood by adding gaseous ammonia during the heat treatment. Gaseous ammonia penetrates rapidly into wood and is expected to form ammonium hydroxide when combined with water in the wood. This modification strategy neutralizes the acids produced by the degradation of hemicelluloses and reduces the degradation of the wood polymer composition and cell-wall structure. The preservation of wood polymer composition and cell-wall structure increases the indentation modulus of the wood cell walls. This increases the strength of the wood cell walls, resulting in an improvement in the mechanical properties of the heat-treated wood. The heat-treated wood’s dimensional stability and equilibrium moisture content are only slightly affected by the weak alkalinity modification.
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热处理添加氨水改善云杉木材力学性能
摘要热处理木材力学性能的退化是一个需要解决的重大问题。本研究旨在通过在热处理过程中添加气态氨来稳定热处理云杉木材的机械强度。气态氨迅速渗透到木材中,当与木材中的水结合时,预计会形成氢氧化铵。这种改性策略中和了半纤维素降解产生的酸,并减少了木材聚合物组合物和细胞壁结构的降解。木材聚合物成分和细胞壁结构的保存增加了木材细胞壁的压痕模量。这增加了木材细胞壁的强度,从而改善了热处理木材的机械性能。弱碱性改性对热处理木材的尺寸稳定性和平衡含水量影响不大。
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来源期刊
Holzforschung
Holzforschung 工程技术-材料科学:纸与木材
CiteScore
4.60
自引率
4.20%
发文量
83
审稿时长
3.3 months
期刊介绍: Holzforschung is an international scholarly journal that publishes cutting-edge research on the biology, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree genetics are also welcome. Rated year after year as one of the top scientific journals in the category of Pulp and Paper (ISI Journal Citation Index), Holzforschung represents innovative, high quality basic and applied research. The German title reflects the journal''s origins in a long scientific tradition, but all articles are published in English to stimulate and promote cooperation between experts all over the world. Ahead-of-print publishing ensures fastest possible knowledge transfer.
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