抄録
In this report, wood was decrystallized at 25°C, 40°C and 60°C by using a non-aqueous solvent, that is a dimethylsulfoxide-chloral mixure, and the relationship between the degree of crystallinity and the dynamic modulus of elasticity of the decrystallized wood was examined. The results obtained are summarized as follows.
(1) Small changes in dimension, weight and density of wood were observed in the process of decrystallization.
(2) The degree of crystallinity and the dynamic modulus of elasticity decreased with increasing treated day. Their decreasing rates were accelerated as the temperature at decrystllizing process was raised.
(3) The apparent activation energy for the decrystallization was estimated roughly by the reaction kinetics. The values calculated from the decrease in the degree of crystallinity and in the modulus of elasticity were about 4-8kcal/mol. Since there is no difference between these two activation energies, it may be considered that the modulus of elasticity of the decrystallized wood is closely related to the degree of crystallinity of wood.
