Table 3.
Time lag results at 30 °C for PIM-PEG-polymers 4a–c synthesized by quenching with PEG-esters of trihydroxybenzoic acid (3a–c) and compared to a freshly prepared PIM-1 membrane synthesized along the first part of Scheme 1.
| PEG-Content wt % a,b) | N2 | O2 | CO2 | CH4 | O2/N2 | CO2/N2 | CO2/CH4 | |
|---|---|---|---|---|---|---|---|---|
| PIM-1 (50 kg/mol) | 0 | 530 | 1480 | 10,000 | 900 | 2.8 | 18.8 | 10.9 |
| Polymer (4a) | 0.6 (0.5) | 490 | 1360 | 9270 | 830 | 2.8 | 18.9 | 11.2 |
| Polymer (4b) | 0.9 (0.9) | 450 | 1265 | 8700 | 780 | 2.8 | 19.2 | 11.2 |
| Polymer (4c) | 3.1 (2.6) | 140 | 370 | 2210 | 270 | 2.7 | 15.8 | 8.2 |
a) Because of TGA measurements of the 1st decomposition step; b) In brackets: Calculated by 1H-NMR integrals.