温度对用酸修饰木材的影响
Assira Keralta1, Johannes Karthäuser2, Jérémy Winninger1
1Renewable Materials Research Center, Department of Wood and Forest Sciences, Université Laval, 2425 Rue de la Terrasse, Quebec City, QC, G1V 0A6, Canada.
概括
酸 (CA) 木材修饰提高了稳定性,但强度下降. 固化温度对这种平衡产生重大影响,140°C为提高木材性能提供了最佳的妥协.
科学领域:
- 材料科学 材料科学 材料科学
- 木材科学 木材科学 木材科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 酸 (CA) 是木材改造的可持续试剂,增强了尺寸稳定性和耐用性.
- 电加热处理可以降低木材的机械强度,而固化温度的作用需要进一步研究.
研究的目的:
- 研究固化温度对CA改性木材的化学,物理和机械性能的影响.
- 为了确定最佳的固化温度,以平衡木材的稳定性和机械强度.
主要方法:
- 苏格兰松树木被修改为30%的CA溶液,并在100,120,140和160°C时固化.
- 使用FTIR和13C NMR分析了化学变化.
- 评估了物理性质 (体重增加,膨胀,胀,排除水分) 和机械性质 (硬度,曲强度).
主要成果:
- 化随温度的增加而增加,改善了尺寸稳定性,特别是在140-160°C.
- 160°C的固化导致细胞壁的水解和显著的强度减少.
- 在140°C时,稳定性和强度之间的最佳平衡得到了实现.
结论:
- 固化温度是优化酸木材改造的关键因素.
- 140°C为增强尺寸稳定性和保持机械强度提供了最好的妥协.
- 研究结果支持可行工业木材改造战略,平衡性能和可持续性.
相关概念视频
Seasoning of Wood
596
Seasoning of wood is a crucial process aimed at reducing and stabilizing the moisture content within the wood to prevent future shrinkage, structural damage, or aesthetic issues once the wood is used in construction. Wood naturally swells when it absorbs moisture and contracts as it dries.
Achieving equilibrium moisture content is the goal of seasoning; this is the point where the wood's moisture content stabilizes to align with the moisture levels of the surrounding environment. Proper...
Achieving equilibrium moisture content is the goal of seasoning; this is the point where the wood's moisture content stabilizes to align with the moisture levels of the surrounding environment. Proper...
596
The Citric Acid Cycle: Overview
24.2K
In aerobic organisms, the citric acid cycle is the second stage of cellular respiration wherein molecules derived from the breakdown of carbohydrates, proteins, and fats are oxidized into carbon dioxide and energy. This process is also known as the tricarboxylic acid (TCA) cycle as the first product of the cycle, citric acid, contains three carboxyl groups in its structure. Alternatively, this cycle is also referred to as the Krebs cycle, in honor of its discoverer Sir Hans Krebs.
The citric...
The citric...
24.2K
Effect of Temperature Change on Reaction Rate
5.2K
The Arrhenius equation,
5.2K
Products of the Citric Acid Cycle
104.3K
The cells of most organisms—including plants and animals—obtain usable energy through aerobic respiration, the oxygen-requiring version of cellular respiration. Aerobic respiration consists of four major stages: glycolysis, pyruvate oxidation, the citric acid cycle, and oxidative phosphorylation. The third major stage, the citric acid cycle, is also known as the Krebs cycle or tricarboxylic acid (TCA) cycle.
104.3K
Acid Attack on Concrete
875
When acids come into contact with concrete, they initiate a chemical reaction that dissolves the hydrated cement paste. This process leads to softening and structural weakening of the concrete. This issue is commonly observed in environments such as chimneys, sewers, and industrial settings. The severity of the damage increases as the pH of the water interacting with the concrete drops below 6.5. In particular, a pH under 4.5 can cause significant concrete damage.
The rate at which hydrogen...
The rate at which hydrogen...
875
The Citric Acid Cycle
164.0K
The citric acid cycle, also known as the Krebs cycle or TCA cycle, consists of several energy-generating reactions that yield one ATP molecule, three NADH molecules, one FADH2 molecule, and two CO2 molecules.
164.0K


