Table 1.
Mechanical Properties of Free Films as a Function of HPMC/EC Ratios and Plasticizer Types (DBP and TEC; n = 6)
| Formulation | Ingredients (ratio by weight) | Thickness (μm) | UTS (MPa) | % Elongation at break | Young's modulus (MPa) | |||
|---|---|---|---|---|---|---|---|---|
| HPMC | EC | DBP | TEC | |||||
| F0 | 10 | 0 | − | − | 42 ± 3 | 83.3 ± 9.9 | 38.5 ± 10.4 | 891.1 ± 47.4 |
| F1 | 10 | 0 | 3 | − | 100 ± 8 | 76.7 ± 7.8 | 107.0 ± 30.9 | 516.9 ± 77.1 |
| F2 | 8 | 2 | 3 | − | 101 ± 18 | 19.9 ± 3.4 | 17.7 ± 3.2 | 137.9 ± 25.7 |
| F3 | 6 | 4 | 3 | − | 118 ± 6 | 6.9 ± 7.4 | 22.1 ± 2.4 | 98.9 ± 14.7 |
| F4 | 4 | 6 | 3 | − | 104 ± 10 | 24.8 ± 3.4 | 27.6 ± 2.6 | 351.8 ± 34.9 |
| F5 | 8 | 2 | − | 3 | 121 ± 26 | 5.7 ± 8.2 | 33.2 ± 7.8 | 99.9 ± 23.6 |
| F6 | 6 | 4 | − | 3 | 106 ± 12 | 0.4 ± 0.3 | 29.2 ± 4.2 | 104.6 ± 12.9 |