Table 3. FTIR peak positions of the all functional groups present in the PEG and PEG-treated bovine apatite.

Name of bond	Peak position (cm−1) in the materials
	PEG	Untreated proximal BA sintered at 900 and 1000°C	PEG-P900 and PEG-P1000
Molecular OH	Absent	3572	3572
Symmetric CH2 stretching	2881		2881
C-H (i.e., alkane) bending and scissoring C-H (i.e., alkane)	1467, 1413, and 1341		1467, 1413, and 1341
C-O and C-C stretching in the crystalline phase	1279		1279
Asymmetric C-O-C stretching	1241		1241
Symmetric C-O-C (i.e., ether) stretching	1146		1146
C-O (i.e., alcoholic) stretching	1095		1095
CO-C axial deformation	1060	1060	1060
Asymmetric PO43- stretching		1023–1027	1023–1027
PO43- stretch symmetric		962	962
= C-H bending	960	960	960
C-CH aliphatic deformation vibration	841		Absent
PO43- vibration		637	Absent
PO43- vibration		Absent	629
PO43- vibration		564, 599	564, 599
C-C vibration	529		Absent