Table 2.

The ATR-FTIR absorption band for SEO samples and vibrational assignments.

Wavenumber (cm−1) of ATR-FTIR Recorded Bands			Vibrational Assignment
L-SEO	B-SEO	EG-SEO
3459	3474	3474	(O-H) stretching vibration [57]
3066	3058	3058	(CH) stretching vibration of CH3 and CH2 (Csp3 and Csp2) [57]
2951	2958	2958
2926	2929	2930
2875	2875	2875
1741	1741	1741	(C=O) stretching vibration in carbonyl group; (C=C) stretching vibration in (>C=CH2), (-CH=CH-), and (-CH=C<) alkyl groups [20,56,57,58,59]
1642	1637	1638
1456	1455	1455	(C-H) symmetric and asymmetric bending vibration of (CH3) and (CH2) groups, (C-H) in-plane bending, (C-O) symmetric and asymmetric stretching vibration, (O-H) in-plane bending, (CH3(CO)) symmetric bending, (C-O-C) symmetric and asymmetric stretching [20,57,59,60]
-	1415	1415
1371	1371	1371
1303	1303	1303
1266	1274	1274
1236	1241	1241
1214	1215	1215
1166	1165	1165
1106	1104	1104
1080	1077	1078
1054	-	-
-	1045	1045
1022	1022	1022
982	983	983	(CH2) and (CH) out-of-plane wagging, (O-H) out-of-plane banding vibration [57,59,60,61]
877	880	879
844	847	848
817	810	810
759	750	750
642	642	642