Solute diffusion into cell walls in solution-impregnated wood under conditioning process IV: effect of temperature on solute diffusivity
Solute diffusion into cell walls in solution-impregnated wood under conditioning process IV: effect of temperature on solute diffusivity
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DOI：
10.1007/s10086-017-1658-8
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发表时间：
2017-08
影响因子：
2.9
通讯作者：
Soichi Tanaka;M. Seki;T. Miki;K. Umemura;Kozo Kanayama
中科院分区：
文献类型：
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作者：
Soichi Tanaka;M. Seki;T. Miki;K. Umemura;Kozo Kanayama
本文研究了浸渍木材在调湿条件下，溶剂挥发过程中溶质向细胞壁的扩散。已知扩散量由溶质扩散率和细胞壁与细胞腔之间的溶质浓度差决定。本文的目的是澄清温度的影响，只有在溶质分子的热振动是定向相关的溶质扩散率。以扁柏、聚乙二醇（PEG 1540）和水为木材样品、溶质和溶剂，研究了扁柏木材木材的力学性能。将浸渍有20质量%溶液的样品在20 ° C、35 ° C或50 °C下调节以完成溶质扩散，所述溶质扩散使用调节后的样品的尺寸评价，然后在真空中干燥。为了统一所有温度下的溶质浓度差，统一平衡含水量，并在调节过程中以三种方式控制溶剂蒸发速率。在35 ° C、50 ° C和20 °C下，溶质扩散率较高，这是通过在相同蒸发速率下的溶质扩散来评估的。结果表明，扩散系数随胞壁尺寸的增大而增大，而不是随溶质分子热振动的增大而增大。
This study has focused on solute diffusing into cell walls in solution-impregnated wood under conditioning, process of evaporating solvent. The amount of the diffusion is known to be determined by the solute diffusivity and the solute-concentration difference between cell walls and cell cavities. Purpose of this paper was to clarify the effect of temperature only on the solute diffusivity that is directionally related to the thermal vibration of the solute molecule. The cross-cut block of hinoki (Chamaecyparis obtusa), polyethylene glycol (PEG1540), and water was employed as wood sample, solute, and solvent, respectively. The sample impregnated with a 20 mass% solution was conditioned at 20, 35, or 50 °C to finish the solute diffusion evaluated using the dimension of the sample that was conditioned followed by drying in a vacuum. To unify the solute-concentration difference, for all temperatures, the equilibrium moisture content was unified and the solvent-evaporation rate was controlled in three ways during conditioning. The solute diffusivity was higher in order of 35, 50, and 20 °C, which was evaluated by the solute diffusion at the same evaporation rate. It is clarified that the diffusivity increases with increasing the dimension of cell walls rather than with increasing the thermal vibration of solute molecule.