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Table 5

FTIR Functional groups of HFFA-CPO and LFFA-CPO and their wavelengths.

Functional group Wavelength of HFFA-CPO Wavelength of LFFA-CPO
-OH stretching 3473 3473
C=C bending vibration (aliphatic) 3004 3005
CH stretching vibration (aliphatic) 2923, 2855 2927, 2855
C=O stretching vibration (ester) 1746 1747
C=O stretching vibration (carboxylic acid) 1712
C–H scissoring and bending vibration (aliphatic) 1459 1465
C–O–C stretching vibration (ester) 1235, 1165, 1118 1235, 1165, 1117
C–H group vibration (aliphatic) 722 722

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