Compression behaviors of acetylated wood in organic liquids. Part II. Drying-set and its recovery |
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| Authors: | Eiichi Obataya Hidefumi Yamauchi |
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| Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, 305-8572 Ibaraki, Japan;(2) Institute of Wood Technology, Akita Prefectural University, 016-0876 Noshiro, Akita, Japan |
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| Abstract: | Unmodified and acetylated cedar wood specimens were swollen in various liquids and dried under radial compression. Two stress
relaxation processes were observed during drying, and the second process observed below the fiber saturation point was responsible
for the drying-set and the temporary fixation of compressive deformation. The fixed shape of acetylated wood was partly recovered
by soaking it in water and toluene and completely recovered in acetone. The effective shape fixation and recovery of toluene-swollen
samples implied that the intermolecular hydrogen bonding was not necessary for the drying-set of acetylated wood. The degree
of shape recovery was not explained by initial softening, while the acetylated wood always exhibited greater recoverability
than unmodified wood. Although 85% stiffness was lost after large compression set and recovery of unmodified wood, such a
stiffness loss was limited to 39% when the acetylated wood was processed with organic liquids. This indicated that the swelling
of the hydrophobic region in the acetylated wood was effective in preventing mechanical damage due to large compressive deformation. |
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