Thermal Behavior of Tacca leontopetaloides Starch-Based Biopolymer

Table 2

Summaries of functional group in pure starch and starch incorporated with glycerol (TPE1), olein oil (TPE2), and crude palm oil (TPE3) and without plasticizer (TPE4).

Types of vibration/samples	Wavelength (cm^−1)
	Pure starch	TPE1	TPE2	TPE3	TPE4
O–H stretch in carboxylic acid	3352.81	3325.18	3348.60	3350.47	3352.40
C=O stretching to CH3 in aldehydes group	—	—	1746.38	1746.38	1733.81
C=O stretch to amides	1646.91	1662.06	1661.82	1651.56	1661.75
N=O bend to C–H3	—	1435.37 and 1375.30	1447.98 and 1375.68	1448.20 and 1375.55	1446.81 and 1375.42
C–O stretching to an ether	1015.84	1027.84	1037.64	1016.43	1015.4