Table 2.
Dependence of gas and water vapor permeability coefficients and corresponding ideal selectivities in PBAT polymer materials containing different amount of pristine and modified-LDHs.
| Materials | Permeability Coefficient (Barrer) a | Ideal Selectivity | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| H2 | O2 | N2 | CO2 | H2O | H2/N2 | H2O/O2 | O2/N2 | CO2/H2 | CO2/N2 | |
| PBAT | 4.92 | 1.22 | 0.33 | 12.5 | 2580 | 15.1 | 2110 | 3.7 | 2.5 | 38.3 |
| PBAT/LDH 2% | 4.53 | 1.04 | 0.31 | 11.0 | 1970 | 14.8 | 1900 | 3.4 | 2.4 | 36.1 |
| PBAT/LDH 5% | 4.38 | 0.95 | 0.31 | 10.0 | 2210 | 14.3 | 2320 | 3.1 | 2.3 | 32.7 |
| PBAT/LDH-349 2% | 4.01 | 0.95 | 0.29 | 9.9 | 1630 | 13.8 | 1730 | 3.3 | 2.5 | 33.9 |
| PBAT/LDH-104 2% | 3.74 | 0.93 | 0.27 | 9.5 | 1360 | 13.7 | 1470 | 3.4 | 2.5 | 34.8 |
| PBAT/LDH-349 5% | 4.97 | 1.08 | 0.34 | 11.7 | 1400 | 14.6 | 1300 | 3.2 | 2.4 | 34.5 |
| PBAT/LDH-351 5% | 4.20 | 1.00 | 0.28 | 10.1 | 1520 | 15.2 | 1520 | 3.6 | 2.4 | 36.5 |
| PBAT/LDH-104 5% | 4.27 | 1.05 | 0.32 | 10.4 | 1710 | 13.2 | 1630 | 3.2 | 2.4 | 32.1 |
a Barrer = 1 × 10−10 cm3 (STP) cm/(cm2 s cm Hg) = 3.3539 × 10−16 mol s−1 m−1 Pa−1.