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Details of band assignments related to the FTIR analyses of βCD, βCD-TDI and βCD-HDI.
| samples | wavelength (cm−1) | assignments |
|---|---|---|
| βCD | 856.1 | α-(1,4)glucopyranose |
| 1024, 1080 | C–OH stretching vibration | |
| βCD-TDI | 1221 | C–O–C of polyurethane |
| 1449 | aromatic group in TDI | |
| 1535, 1656 | NHCO, carbamate linkage | |
| 2270 | absence of isocyanate group | |
| βCD-HDI | 1256 | C–O–C of polyurethane |
| 1590 | NHCO, carbamate linkage | |
| 2270 | absence of isocyanate group | |
| 2940, 2856 | CH2 asymmetric stretching vibration in HDI |
