Water absorption of boron-treated and heat-modified wood |
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| Authors: | Saip Nami Kartal Won-Joung Hwang Yuji Imamura |
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| Institution: | (1) Forestry Faculty, Istanbul University, Bahcekoy, 34473 Istanbul, Turkey;(2) Research Institute for Sustainable Humanosphere (RISH), Kyoto University, Kyoto 611-0011, Japan |
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| Abstract: | Heat treatments change the chemical and physical properties of wood and dimensional stability and hygroscopicity are affected
as a result of modifications of wood cell components. This study evaluated the water absorption of wood specimens treated
with boron compounds followed by heat treatment. Sugi (Cryptomeria japonica D. Don) sapwood specimens treated with either boric acid (BA) or disodium octoborate tetrahydrate (DOT) solutions were heat-modified
at either 180° or 220°C for 2 or 4 h. Carbohydrate composition and water absorption of the specimens were then measured and
compared with those of untreated and unheated specimens. Wood carbohydrates were significantly degraded in the specimens after
heat treatment. The heat treatment evidently decreased the water absorption and the heat-modified specimens absorbed less
water than unheated specimens. The higher the treatment temperature and the longer the treatment time, the lower the amount
of absorbed water. The boron-treated and heat-modified specimens, however, showed increased water absorption due to the hygroscopic
properties of BA and DOT. |
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| Keywords: | Heat treatment Chemical composition Water absorption Boron compounds |
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