Acetylation of Wood Flour from Four Wood Species Grown in Nigeria Using Vinegar and Acetic Anhydride

Y. Azeh, G. Olatunji, C. Mohammed, P. Mamza
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引用次数: 24

Abstract

Effect of acetylation on pretreated wood flour of four different wood species, Boabab (Adansonia digitata), Mahoganny (Daniella oliveri), African locust bean (Parkia biglobosa) and Beech wood (Gmelina arborea), had been investigated. The first batch of wood species were acetylated using acetic anhydride while the second batch were acetylated with commercial vinegar. Both experiments were conducted in the presence of varying amount of CaCl2 as catalyst and at temperature of 120°C for 3 h. The success of acetylation was determined based on Weight Percent Gain for each sample treated with either chemicals used. FT-IR, a veritable tool was used for the analysis of both treated and untreated samples to further investigate the success of acetylation. The results showed the presence of important band such as carbonyl absorptions at 1743, 1744, 1746, 1731, 1718 and 1696 cm−1 as appeared separately in the spectra of acetylated samples, confirming esterification occurred. The purpose of this work was to investigate the applicability of vinegar for acetylation of lignocellulosic fibers. Blends/composites were prepared by solution casting and their kinetics investigated in distilled water. The results indicated they could be used in outdoor applications such as, decking and packaging.
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用醋和醋酸酐对尼日利亚四种木材制成的木粉进行乙酰化
研究了乙酰化处理对四种不同木材(山楂木、红木、刺槐豆和山毛榉)预处理木粉的影响。第一批用乙酸酐进行乙酰化处理,第二批用商品醋进行乙酰化处理。两个实验都是在不同量的CaCl2作为催化剂的情况下,在120℃的温度下进行3 h。乙酰化反应的成功与否取决于每种化学物质处理的样品的重量百分比增益。FT-IR是一种名副其实的工具,用于分析处理和未处理的样品,以进一步研究乙酰化的成功。结果表明,在1743、1744、1746、1731、1718和1696 cm−1处分别出现了羰基吸收,证实了酯化反应的发生。本研究的目的是研究醋在木质纤维素纤维乙酰化中的适用性。采用溶液铸造法制备了共混/复合材料,并在蒸馏水中对其动力学进行了研究。结果表明,它们可以用于户外应用,如装饰和包装。
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