International Journal of Carbohydrate Chemistry / 2011 / Article / Tab 2

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 ( c m − 1 ) Assignment

3500–3300O–H stretching
2800–3000 C–H stretching in methyl and methylene groups
2920, 2850Aliphatic CH2 asymmetric stretch
1750–1730C=O stretching in carbonyl
1640–1618C=C alkenes
1510–1504C=C aromatic skeletal vibrations
1462–1425CH2 lignin
1384–1350Phenol–borate B–O
1260–1234C–O stretching vibration in lignin and hemicelluloses’
1170–1153C–O–C asymmetric bond
756Out-of-plane ring deformation
691COH out-of-plane ring bending

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