Hygrothermal recovery of compression wood in relation to elastic growth stress and its physicochemical characteristics
Hygrothermal recovery of compression wood in relation to elastic growth stress and its physicochemical characteristics
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DOI：
10.1007/s10853-016-0065-7
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发表时间：
2016-05
影响因子：
4.5
通讯作者：
Miyuki Ueda Matsuo;Ginji Niimi;K. Sujan;Masato Yoshida;Hiroyuki Yamamoto
中科院分区：
文献类型：
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作者：
Miyuki Ueda Matsuo;Ginji Niimi;K. Sujan;Masato Yoshida;Hiroyuki Yamamoto
以杉木（Cryptomeria japonica）压缩材和普通材为研究对象，研究了木材在湿热处理后的尺寸变化。在活树表面测量了生长应力的弹性释放应变；随后，在同一位置取标本测量HTR。HTR测量的是在20、40、60、80和100°C的热水中处理200分钟至177天后的尺寸变化。HTR强度与生长应力的弹性释放应变呈正相关。这一结果表明，HTR是树木成熟过程中积累的生长应力粘弹性组分的松弛。高温还原率明显表现出时间-温度依赖性：处理温度越高，处理温度越低。基于动力学分析，计算得到表观活化能（Ea）为407 kJ/mol，与已发表的木质素软化的表观活化能（Ea）相似，表明HTR是木质素相关的现象。
Hygrothermal recovery (HTR), the dimensional changes in wood induced by hygrothermal treatment, was investigated using both compression and normal wood of sugi (Cryptomeria japonica). The elastic released strain of growth stress was measured on living tree surfaces; subsequently, the specimens were taken from the same position to measure HTR. HTR was measured as dimensional changes due to treatment at 20, 40, 60, 80, and 100 °C in hot water ranging from 200 min to 177 days. The intensity of HTR had a positive relationship with elastic released strain of growth stress. This result suggests that HTR is the relaxation of the viscoelastic component of growth stress accumulated during the maturation process of trees. The rate of HTR clearly showed a time–temperature dependency: higher at higher treatment temperatures and lower at lower treatment temperatures. Based on kinetic analysis, the apparent activation energy (Ea) was calculated as 407 kJ/mol, which is similar to the publishedEaof lignin softening implying that the HTR is a lignin-related phenomenon.