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Journal of Agricultural Science and Technology، جلد ۱۰، شماره ۳، صفحات ۲۵۳-۲۵۹
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عنوان انگلیسی Application of ATR Infrared Spectroscopy in Wood Acetylation
چکیده انگلیسی مقاله Acetylation is a chemical modification of wood to enhance its properties. IR-spectroscopy is a useful technique for proofing chemical bondings in wood and the At-tenuated Total Reflection (ATR) Infrared Spectroscopy technique was applied as an eas-ier technique over other IR-spectroscopies. In this research, different degrees of acetyla-tion, weight percentage gains (WPGs) in beech and pine mini-stakes were achieved by us-ing acetic anhydride. Acetylated samples were analyzed by applying an Attenuated Total Reflection (ATR) Infrared Spectroscopy technique. Comparison of the acetylated samples with non-acetylated woods showed that hydroxyl groups (O-H) were diminished at wave numbers of about 3,354-3,328 cm-1 due to the substitution of hydrophobic acetyl groups in cell wall polymers. A strong peak appeared at wave numbers of about 1,733-1,728 cm-1 in beech and 1,737-1,728 cm-1 in pine due to the carbonyl (C=O) stretching of acetyl groups. The magnitude of the bands increased with raising the weight percentage gains (WPGs). The methyl deformation of the acetyl groups induced at wave number 1369 cm-1 caused by the stretching of C-H in polysaccharides. There was also a clear increase in the magni-tude of the wave numbers at about 1234-1226 cm-1 in beech and 1236-1226 cm-1 in pine due to the stretching of C-O and carbonyl deformation in the ester bonds during the ace-tylation of lignin.
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نویسندگان مقاله | B. Mohebby
Department of Wood and Paper Science, Faculty of Natural Resources and Marine Science, Tarbiat Modares University, P. O. Box: 46414-356, Noor, Islamic Republic of Iran
نشانی اینترنتی http://journals.modares.ac.ir/browse.php?a_code=A-23-1000-3077&slc_lang=en&sid=23
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