The relationship between hygroscopicity and the microsurface of heated wood was examined using
the fractal surface dimensionality. The hygroscopicity of heated wood decreased with the increase
in heating temperature to 250°C, and then decreased again above 350°C after increasing up
to 350°C. This change corresponded to chemical changes in the wood, especially a reduction in hydroxyl
groups, up to 250°C, and to the temperature dependence of the fractal dimensionality calculated
from nitrogen gas adsorption above 250°C. The fractal dimensionality increased gradually
from 100 to 250°C, followed by a rapid increase above 250°C with a peak at 350°C, and leveled off
above 400°C. From the results, it is concluded that hygroscopicity of heated wood changes at
250°C and that it is dependent upon the chemical properties of wood below 250°C and upon the
surface complexity above 250°C.
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