Sorption behaviour of thermally and chemically modified selected wood species

F. A. Faruwa, E. Iyiola
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Abstract

This study investigates the sorption behaviour of thermally and chemically modified selected wood species. Wood samples of dimensions 20 mm × 20 mm × 20 mm were used in this study. The samples were oven dried and thermally treated at temperatures of 160°C, 180°C and 200°C for 30 minutes. Another set of wood samples were prepared for chemical treatment (Acetylation) inside an oven at 80C for 180 min. The colour varied from light cream to slightly brown at 160°C and very brown at 200°C for thermally modified wood. The color of the chemical modified wood changes from being yellowish of the untreated wood to pale yellow in colour. The percentage weight loss increases with temperature from 22.62% at 160°C to 26.46% at 180°C and 20.8% for Percentage Weight Gain (PWG). The average value of water absorption ranged from 8.60 to 16 %; 26 to 40.78 %; 35 to 50.35 % and 42.88 to 57.53 % for 1 hour to 78 hrs respectively. The value for the chemically modified wood ranged between 5.22 and 5.59 %, with RH of 97% and 7% having the lowest and highest value respectively. The study revealed that there was a reduction in the weight and density of thermally treated wood as a result of thermolysis and weight was gained after chemical modification.
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热改性和化学改性精选木材的吸附行为
本研究考察了经热改性和化学改性的精选木材的吸附行为。本研究采用尺寸为20 mm × 20 mm × 20 mm的木材样品。样品在160°C、180°C和200°C的温度下进行烘箱干燥和热处理30分钟。另一组木材样品在80℃的烤箱中进行化学处理(乙酰化)180分钟。在160℃时,颜色从浅奶油色到微棕色,在200℃时,热改性木材的颜色非常棕色。化学改性木材的颜色由未处理木材的淡黄色变为淡黄色。随着温度的升高,失重百分比从160℃时的22.62%增加到180℃时的26.46%,增重百分比(PWG)增加到20.8%。平均吸水率为8.60% ~ 16%;26% ~ 40.78%;1小时~ 78小时,分别为35 ~ 50.35%和42.88 ~ 57.53%。化学改性木材的相对湿度在5.22 ~ 5.59%之间,相对湿度最低为97%,最高为7%。研究表明,热处理木材的重量和密度由于热分解而减少,化学改性后重量增加。
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