Application of ATR Infrared Spectroscopy in Wood Acetylation | ||
| Journal of Agricultural Science and Technology | ||
| Article 7, Volume 10, Issue 3, 2008, Pages 253-259 PDF (234.75 K) | ||
| Author | ||
| 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 | ||
| Abstract | ||
| 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. | ||
| Keywords | ||
| Acetylation; Acetyl groups; Attenuated total reflection; Infrared Spectroscopy; Beech; IR spectroscopy | ||
|
Statistics Article View: 135 PDF Download: 121 |
||
| Number of Journals | 45 |
| Number of Issues | 2,196 |
| Number of Articles | 24,877 |
| Article View | 28,790,504 |
| PDF Download | 18,604,730 |