Research Article
Effect of Addition of Boric Acid and Borax on Fire-Retardant and Mechanical Properties of Urea Formaldehyde Saw Dust Composites
Table 2
Infrared assignments for absorption peaks of sawdust wood modified by urea formaldehyde and different concentrations of (BA + BX).
| wave number | Assignment |
| 3500–3300 | O–H stretching | 2800–3000 | C–H stretching in methyl and methylene groups | 2920, 2850 | Aliphatic CH2 asymmetric stretch | 1750–1730 | C=O stretching in carbonyl | 1640–1618 | C=C alkenes | 1510–1504 | C=C aromatic skeletal vibrations | 1462–1425 | CH2 lignin | 1384–1350 | Phenol–borate B–O | 1260–1234 | C–O stretching vibration in lignin and hemicelluloses’ | 1170–1153 | C–O–C asymmetric bond | 756 | Out-of-plane ring deformation | 691 | COH out-of-plane ring bending |
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