100～200℃の温度域における木材および木材構成成分の吸発熱挙動
100～200℃の温度域における木材および木材構成成分の吸発熱挙動
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木材及木质构件在100-200℃温度范围内的吸热及吸热行为
DOI：
10.2472/jsms.61.323
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
公三 金山
中科院分区：
文献类型：
--
作者：
裕三 古田;圭輔 神代;恒久 三木;公三 金山
为阐明木材在100°C ~ 200°C热处理的机理，采用变温差示扫描量热法（DSC）测定了干燥空气条件下木材及木材组分（纤维素、半纤维素、木质素）在100°C ~ 200°C的吸热和放热行为。在逐步加热和冷却循环（100°C→140°C → 100°C→160° C → 100 °C→180° C → 100 °C→200 °C，±5°C/min）下的加热过程中进行测量。木材、纤维素和半纤维素在第一次加热过程（100°C→140°C）中的总热流（THF）和不可逆热流（NRHF）曲线与其它加热过程的曲线相比，均位于放热侧。与其他加热过程的曲线相比，木材在第4次加热过程（100°C→200°C）中的反向热流曲线位于放热侧。而纤维素和半纤维素的RHF曲线几乎在同一条线上。木质素的THF和NRHF曲线随着升温和降温循环的进行而向放热侧移动。另一方面，木质素的RHF曲线随着循环次数的增加而向吸热侧移动。这些结果表明，在100°C和200°C之间对木材进行热处理的效果是基于由于加热历史而导致的纤维素、半纤维素和特别是木质素的构象的热力学稳定性。
To clarify the mechanism of the heat-treatment for wood between 100°C and 200°C, the behaviors of endothermic and exothermic of wood and wood components (cellulose, hemicellulose, lignin) between 100°C and 200°C under the dried air condition were measured using the temperature-modulated DSC. The measurement were carried out in the heating processes under stepwise heating and cooling cycles (100°C→140°C→100°C→160°C→100°C→180°C→100°C→200°C, ±5°C/min). The total heat flow (THF) and the nonreversing heat flow (NRHF) curves of wood, cellulose and hemicellulose in the 1st heating process (100°C→140°C) were found in the exothermic side compared with the curves in other heating processes. The reversing heat flow (RHF) curves of wood in the 4th heating process (100°C→200°C) were found in the exothermic side compared with the curves in other heating processes. However the RHF curves of cellulose and hemicellulose were observed on the almost same line. The THF and NRHF curves of lignin were shifted to the exothermic side with the stepwise heating and cooling cycles. On the other hand, the RHF curves of lignin were shifted to the endothermic side with the cycles. These results suggest that the effects of the heat-treatment for wood between 100°C and 200°C are based on the thermodynamic stabilization of the conformation of cellulose, hemicellulose and especially lignin due to the heating history.
木材的蠕变因含水量的变化而不稳定。
DOI：
--
发表时间：
2005
期刊：
Holzforschung 59
影响因子：
--
作者：
Chika Takahashi;Yutaka Ishimaru;Ikuho Iida;Yuzo Furuta
通讯作者：
Yuzo Furuta