Poplar wood heat treatment: effect of air ventilation rate and initial moisture content on reaction kinetics, physical and mechanical properties
Poplar wood heat treatment: effect of air ventilation rate and initial moisture content on reaction kinetics, physical and mechanical properties
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DOI：
10.1007/s00226-014-0677-5
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发表时间：
2014-10
影响因子：
3.4
通讯作者：
G. Goli;B. Marcon;M. Fioravanti
中科院分区：
文献类型：
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作者：
G. Goli;B. Marcon;M. Fioravanti
本文分析了杨木热处理动力学及其对杨木某些物理力学性能的影响。动力学测试在不同的处理温度和两种不同的通风设置下进行[低和高空气交换率（AER）与外部]。根据时间内的质量损失，从烘箱干燥条件出发，研究了处理动力学。对时间-温度的等效性进行了检验，质量损失与时间的关系通过一条主曲线形式化。分析清楚地表明，即使发现相似的活化能值，低AER和高AER下的热处理也表现出不同的降解动力学。研究了木材在干燥或标准环境条件下，经过质量损失达7%和10%的处理后的一些物理力学性能。与未处理的样本相比，所有处理过的样本都显示出统计学上的显著差异。干质量损失为7%或10%的处理表现出均匀性。除杨氏模量外，在干燥或标准环境条件下开始的处理也有同样的趋势，与干燥样品相比，湿启动条件下的降低幅度较小。
The kinetics of heat treatment as well as its effect on some physical and mechanical properties of poplar wood (Populus albaL.) were analysed in this research. Kinetic tests were performed at different treatment temperatures and two different air ventilation settings [low and high air exchange rate (AER) with the exterior]. The treatment kinetics was studied, starting from the oven-dry condition, according to the mass loss during time. The time–temperature equivalency was checked, the mass loss versus time formalised through a master curve. The analysis clearly showed how the heat treatment at low and high AER presents different degradation kinetics even if similar activation energy values were found. Some physical and mechanical properties of wood after treatments up to a mass loss of 7 and 10 % starting from oven-dry or standard environmental conditions state were also studied. All of the treated samples showed statistically significant differences compared to the untreated one. The treatments performed at 7 or 10 % of dry mass loss showed homogeneous behaviour. The same tendency was observed for the treatments starting at oven-dry or standard environmental conditions with the exception of Young’s modulus, which resulted in smaller reductions in wet starting condition when compared to dry samples.