Effects of previous solvent exchange on acetylation of wood |
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Authors: | Eiichi Obataya Kazuya Minato |
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Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, Ibaraki 305-8572, Japan;(2) Graduate School of Agriculture, Kyoto Prefectural University, Kyoto, 606-8522, Japan |
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Abstract: | Wood specimens were prepared in a swollen state using solvent exchange (PS) treatment. The swollen wood specimens were acetylated
using acetic anhydride by heating at 80–120°C. At the beginning of heating, the weight percent gain (WPG) of PS-treated wood
was greater than that of conventionally acetylated wood. This acceleration effect of the PS treatment was explained by the
introduction of treating reagent into the wood polymers where the intermolecular hydrogen bonds were previously broken. On
the other hand, the PS treatment had no influence on the final WPG and moisture sorption characteristics of acetylated wood.
This indicated that the intrinsic reactivity of wood constituents was unaffected by the PS treatment. The acetylation of PS-treated
wood produced greater bulking and slightly higher dimensional stability than that in the case of conventional acetylation
at the same WPG. It was speculated that the expansion of cell lumina due to the PS treatment resulted in greater bulking on
acetylation and lesser swelling of acetylated wood with moisture sorption. |
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Keywords: | |
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