Acetylation of wood using supercritical carbon dioxide
2016
Kobayashi, M. | Hewage, D. C. | Matsunaga, M. | Kataoka, Y. | Ishikawa, A. | Kiguchi, M.
This study investigated the effects of acetylation using supercritical carbon dioxide (CO2) on dimensional stability of four wood species grown in Sri Lanka. Heartwood specimens of Paraserianthes falcata, Alstonia macrophylla, Pinus caribaea and Hevea brasiliensis were acetylated with acetic anhydride using supercritical CO2 (120 °C, 10–12 MPa), and their dimensional stability was evaluated. Results showed that anti-swelling efficiency values of the wood species increased to over 60% after 8 hours of acetylation. In particular, A. macrophylla exhibited a relatively high anti-swelling efficiency. High anti-swelling efficiency of A. macrophylla was caused by the large swelling of this high specific gravity wood.
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