Takato Nakano, Junji Sugiyama, Misato Norimoto
Contractive Force and Transformation of Microfibril with Aqueous Sodium Hydroxide Solution for Wood
Summary
The mechanism of longitudinal contraction of Yezo spruce (Picea jezoensis Carr.) during treatment with
aqueous NaOH solution is discussed. The contraction of wood samples increased with an increase in the
concentration of NaOH solution and in heating temperature. Measurements of the stress relaxation and
the twist angle during the alkali treatment showed that the alkali treatment caused the contractive and
twist forces of a tracheid cell wall in longitudinal and tangential directions, depending on the components
of contractive force. The temperature dependence of the contraction and the thermodynamics led
to the conclusion that the longitudinal contraction of samples is due to that of microfibrils via an entropy-elastic
force.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 54, 04/2000
Pages: 315 - 320
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