Table 6.
Transport properties of supported PVA-0-20 and PVA-5-20 membranes prepared using surface LbL modification after pervaporation of 80 wt % isopropanol–20 wt % water mixture at 22 °C.
| Pair of PEL | Charge Concentration (Number of Ion Pairs/Number of C Atoms in Repeat Unit) | Number of Bilayers | Membranes | |||
|---|---|---|---|---|---|---|
| PVA-0-20 | PVA-5-20 | |||||
| Permeation Flux, kg/(m2h) | Water Content in Permeate, wt % | Permeation Flux, kg/(m2h) | Water Content in Permeate, wt % | |||
| PSS, PAH | 0.09 | 5 bilayers | 0.250 | 92.0 | 0.282 | 95.5 |
| 10 bilayers | 0.270 | 90.6 | 0.296 | 92.6 | ||
| PSS, CS | 0.0625 | 5 bilayers | 0.334 | 94.0 | 0.340 | 95.6 |
| 10 bilayers | 0.229 | 89.3 | 0.252 | 93.3 | ||