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 (cm^−1)	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