Table 2.
Time lag measurements at 30 °C of four gases using membranes formed by blending PIM-1 with different PEGs.
| PEG-Content wt % d) | Permeability (Barrer b)) | Selectivity c) | ||||||
|---|---|---|---|---|---|---|---|---|
| N2 | O2 | CO2 | CH4 | O2/N2 | CO2/N2 | CO2/CH4 | ||
| PIM-1 a) | 0 | 360 | 1030 | 7160 | 590 | 2.8 | 19.9 | 12.1 |
| + PEG-200 | 6.2 | 115 | 310 | 2335 | 199 | 2.7 | 20.2 | 11.7 |
| + PEG-1000 | 5.3 | 120 | 361 | 2776 | 211 | 3.0 | 23.0 | 13.1 |
| + PEG-2000 | 5.0 | 100 | 314 | 2513 | 177 | 3.2 | 25.5 | 14.2 |
| + PEG-200 | 10.0 | 40 | 122 | 1097 | 78 | 3.0 | 26.8 | 14.1 |
| + PEG-1000 | 12.2 | 28 | 95 | 806 | 46 | 3.3 | 28.4 | 17.6 |
| + PEG-2000 | 11.0 | 20 | 74 | 660 | 37 | 3.5 | 30.9 | 18.0 |
a) Mw ca. 300 kg/mol (SEC/MALS detector); b) 1 × 10−10 (cm3(STP)cm cm−2 s−1cm Hg−1); c) Calculated from single gas measurements; d) Content of PEG as calculated from TGA.