Table 1.

Main IR frequencies with assignments.

Samples	Wavelength (cm−1)	Assignments
βCD-TDI	3307	N–H and O–H stretch
	2270	Absence of isocyanate group
	1653, 1534	NHCO, carbamate linkage
	1450	Aromatic group in TDI
βCD-BIMOTs-TDI	3302	N–H, O–H stretch and imidazole ring
	2270	Absence of isocyanate group
	1600, 1412	Aromatic group in TDI
	1535, 1651	NHCO, carbamate linkage
	1153	C–N stretch