Table 1.
The gas permeabilities Px, diffusivity Dx, solubility coefficient Sx and ideal selectivities α (Px/PN2) for a methanol treated film of PIM-Trip-TB of thickness = 132 μm with comparable data for a the same film obtained after 100 days given in parentheses. To allow a direct comparison, data from a film of PIM-EA-TB (180 μm) (and aged for 470 day in parentheses), following an identical pre-treatment, is provided. Px and Dx values were determined by time lag analysis, Sx was determined by gravimetric sorption measurements
| N2 | O2 | CO2 | CH4 | H2 | He | |
|---|---|---|---|---|---|---|
| Px (PIM-Trip-TB) [Barrer] | 629 (189) | 2718 (1073) | 9709 (3951) | 905 (218) | 8039 (4740) | 2500 (1585) |
| α (Px/PN2) (PIM-Trip-TB) | – (–) | 4.3 (5.7) | 15.9 (21.0) | 1.4 (1.4) | 12.8 (25.1) | 4.0 (8.4) |
| Dx (PIM-Trip-TB) [10−12 m2/s] | 135 (28.5) | 462 (148) | 111 (34.6) | 48.9 (7.5) | >7800 (4900) | >10000 a) (>7700) |
| Dx/DN2 (PIM-Trip-TB) | – | 3.4 (5.2) | 0.82 (1.3) | 0.36 (0.26) | 58 a) (172) | 74 a) (270) |
| Sx (PIM-Trip-TB) [cm3 cm−3 bar−1] | 5.3 | – | 51.0 | 21.5 | – | – |
| Sx/SN2 (PIM-Trip-TB) | – | – | 9.6 | 4.1 | – | – |
| Px (PIM-EA-TB) [Barrer] | 580 (188) | 2294 (933) | 7696 (2644) | 774 (219) | 8114 (4442) | 2685 (1630) |
| α (Px/PN2) (PIM-EA-TB) | – (–) | 3.95 (4.95) | 13.3 (14.1) | 1.3 (1.2) | 14.0 (23.6) | 4.6 (8.7) |
| Dx (PIM-EA-TB) [10−12 m2/s] | 89 (22.9) | 310 (104) | 76.4 (35.2) | 31.9 (6.9) | >7200 (4000) | >10000 a) (>7700) |
| Dx/DN2 (PIM-EA-TB) | – | 3.48 (4.5) | 0.82 (1.54) | 0.36 (0.30) | 81 a) (174) | 113 a) (337) |
| Sx (PIM-EA-TB) [cm3 cm−3 bar−1] | 4.4 | – | 47.0 | 17.2 | ||
| Sx/SN2 (PIM-EA(Me)-TB) | – | – | 10.8 | 3.9 | – | – |
a)
For He and H2 the time lag is too short (<1 s) for absolute determination of D and the indicated value of D is the minimum limit.