Table 1.
Tensile properties (elastic modulus: EM, tensile strength: TS, and deformation at break: %E) and barrier properties (water vapor permeability (WVP), oxygen permeability (OP), and limonene permeability (LP)) of starch-polyester bilayer films (S-P) and FA coated starch-polyester bilayer films (S-P-AF) at time zero and after 1 and 2 storage months. Mean values and standard deviation.
| Bilayer Film | S-P | S-P-AF | ||||
|---|---|---|---|---|---|---|
| t0 | t1 | t2 | t0 | t1 | t2 | |
| Thickness (µm) | 239 ± 10 a1 | 235 ± 12 a1 | 230 ± 18 a1 | 231 ± 15 a1 | 234 ± 14 a1 | 228 ± 10 a1 |
| EM (MPa) | 871 ± 21 a1 | 850 ± 47 a1 | 863 ± 18 a1 | 850 ± 10 a1 | 887 ± 53 a1 | 875 ± 25 a1 |
| TS (MPa) | 18.0 ± 2.0 a1 | 16.0 ± 2.0 a1 | 17.0 ± 1.0 a1 | 17.0 ± 3.0 a1 | 18.0 ± 4.0 a1 | 19.0 ± 3.0 a1 |
| E (%) | 3.0 ± 0.5 a1 | 3.0 ± 1.0 a1 | 2.0 ± 0.5 b1 | 3.0 ± 1.0 a1 | 3.0 ± 1.0 a1 | 3.5 ± 0.4 a1 |
| OP × 1014 (cm3⋅m−1⋅s−1⋅Pa−1) |
1.25 ± 0.08 a1 | 1.30 ± 0.03 a1 | 1.28 ± 0.01 a1 | 1.27± 0.02 a1 | 1.28 ± 0.02 a1 | 1.30 ± 0.04 a1 |
| WVP (g⋅mm⋅kPa−1⋅h−1⋅m−2) |
1.6 ± 0.2 a1 | 1.7 ± 0.1 a1 | 1.4 ± 0.2 a1 | 1.5 ± 0.3 a1 | 1.3 ± 0.2 b1 | 1.7 ± 0.4 a1 |
| LP (g⋅mm⋅kPa−1⋅h−1⋅m−2) |
1.2 ± 0.2 a1 | 1.3 ± 0.1 a1 | 1.5 ± 0.2 a1 | 1.1 ± 0.4 a1 | 1.0 ± 0.1 b1 | 1.3 ± 0.3 a1 |
Different superscript letters (a,b) indicate significant differences among formulations (p < 0.05). Different superscript numbers indicate significant differences between the three storage times (p < 0.05).