Artificial aging of wood monitored by dynamic viscoelasticity measurement

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  • 動的粘弾性測定による木材の人為的老化過程の追跡
  • Artificial aging of wood monitored by d

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Abstract

In order to accelerate the aging of wood, we successively monitored the dynamic viscoelastic properties of yellow birch heartwood during heating at elevated temperature. The dynamic Young's modulus of wood heated at 160 ℃ and over decreased from the start of heating without any signs of increase as generally reported. On the other hand, the loss tangent decreased to the appreciable extent in the initial stage of heating. The latter change is probably due to the crystallization of cellulose molecules and/or the rearrangement of hydrogen bonds. However, the change of loss tangent by short-term heating was too slight to enhance the sound quality of musical instruments. The mechanical changes caused by short-term heating at elevated temperature was not equivalent to those by leaving in the atmospheric condition for long-term. Therefore, the acceleration of desirable mechanical changes without serious thermal degradation would not be prospective unless the contribution of moisture was considered.

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