Table 2.
Band assignment for Cloisite Na, Cloisite 20A, and Eudragit RS.
| Components | IR Absorption Band (cm−1) | Band Assignment |
|---|---|---|
| Cloisite Na | 1636 | δ (O-H) for adsorbed H2O |
| 1078 | γ (Si-O) (out-of-plane) | |
| 1007 | γ (Si-O) (in-of-plane) | |
| 919 | δ (Al-Al-OH) | |
| Cloisite 20 | 1645 | δ (O-H) for adsorbed H2O |
| 1467 | δ (C-H) of Aliphatic | |
| 1080 | γ (Si-O) (out-of-plane) | |
| 1035 | γ (Si-O) (in-of-plane) | |
| 1027 | γ (Si-O) (in-of-plane) | |
| 919 | δ (Al-Al-OH) | |
| Eudragit RS | 1728 | δ(C=O) for ester group |
| 1448 | δ(C-H) of alkyl chains | |
| 1386 | δ(C-H) of alkyl chains | |
| 1238 | γ (O=C-O) for ester group | |
| 1147 | γ (O=C-O) for ester group |
δ = Bending vibration; γ = Stretching vibration.