“… 31 The symmetric vibration of –CH 2 – is attributed to the peaks at 2855 cm –1 , 2844 cm –1 , and 2850 cm –1 in EDA, BDA, and PDA, whereas the asymmetric vibration of –CH 2 – is attributed to the peaks at 2924 cm –1 , 2922 cm –1 , and 2923 cm –1 , respectively, 32 which became weaker in MED, MBD, and MPD polymers. In epoxidized soyabean oil, the peak at 842 cm –1 is assigned to the out-of-plane deformation, whereas the peak at 1743 cm –1 represents stretching of the triglyceride carbonyls of ESO, 33 almost vanished in the final product, and the additional peak is found at around 1637 cm –1 , attributed to the amide carbonyl (−NH–C=O) stretching, 33 indicates that ester bonds have been converted into amide connections as a result of processes involving aliphatic amino groups and triglyceride. More specifically, the C–N stretching peak and the NH 2 bending peak of MED, MBD, and MPD polymers are observed between 1100 and 1700 cm –1 .…”