Gas diffusivity and solubility of copolymer membranes.
| Membrane | Feed ratio | D a | S b | ||||
|---|---|---|---|---|---|---|---|
| O2 | CO2 | N2 | O2 | CO2 | N2 | ||
| SPP : BDPA | |||||||
| Poly(SPP-co-BDPA) | 1 : 4 | 41 | 35 | 38 | 39 | 170 | 20 |
| 1 : 2 | 38 | 33 | 37 | 26 | 120 | 11 | |
| 1 : 1 | 26 | 28 | 24 | 26 | 114 | 10 | |
| 2 : 1 | 25 | 27 | 23 | 26 | 110 | 10 | |
| 4 : 1 | 23 | 24 | 19 | 24 | 100 | 9.5 | |
| DSpoly(SPP-co-BDPA) | 1 : 4 | 45 | 37 | 39 | 40 | 176 | 20 |
| 1 : 2 | 42 | 35 | 38 | 36 | 157 | 17 | |
| 1 : 1 | 40 | 33 | 33 | 30 | 145 | 15 | |
| 2 : 1 | 37 | 30 | 25 | 27 | 140 | 14 | |
| 4 : 1 | 27 | 27 | 20 | 26 | 130 | 10 | |
| SPP : SDPA | |||||||
| Poly(SPP-co-SDPA) | 1 : 4 | 100 | 80 | 70 | 21 | 105 | 14 |
| 1 : 2 | 70 | 60 | 50 | 17 | 72 | 9.6 | |
| 1 : 1 | 50 | 50 | 32 | 15 | 66 | 8.8 | |
| 2 : 1 | 48 | 47 | 30 | 14 | 64 | 7.3 | |
| 4 : 1 | 44 | 40 | 28 | 13 | 62 | 6.4 | |
| DSpoly(SPP-co-SDPA) | 1 : 4 | 80 | 60 | 65 | 20 | 83 | 10 |
| 1 : 2 | 40 | 33 | 30 | 15 | 70 | 5.7 | |
| 1 : 1 | 35 | 30 | 20 | 11 | 54 | 5.0 | |
| 2 : 1 | 30 | 28 | 17 | 10 | 53 | 4.7 | |
| 4 : 1 | 20 | 23 | 10 | 7.5 | 43 | 3.8 | |
Diffusion coefficient (10−7 cm2 s−1).
Solubility coefficient [10−3 cm3 (STP) cm−3 cmHg−1].