Abstract
Sugi heartwood was acetylated with acetic anhydride in supercritical carbon dioxide (CO2) (120°C or 130°C, 10–12 MPa). As a result, the weight percent gain increased with increasing acetylation time up to 16%–20% at 1 h and 24%–28% at 24 h. The antiswelling efficiency of the acetylated specimens reached 75%–80% at 3–4 h of acetylation. It is supposed that the acetylation in supercritical CO2 has a high bulking effect compared with liquid-phase and vapor-phase acetylation with uncatalyzed acetic anhydride. The results showed that the acetylation progressed rapidly because supercritical CO2 and acetic anhydride formed a single phase at more than 90°C, and the acetic anhydride reached the reaction sites in the wood quickly.
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Matsunaga, M., Kataoka, Y., Matsunaga, H. et al. A novel method of acetylation of wood using supercritical carbon dioxide. J Wood Sci 56, 293–298 (2010). https://doi.org/10.1007/s10086-009-1098-1
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DOI: https://doi.org/10.1007/s10086-009-1098-1