Table 2.
He permeability (Barrer), He/N2 and He/CH4 selectivities in a range of polymeric membranes.
| Polymer | He Permeability | He/N2 | He/CH4 | Ref. | Citations |
|---|---|---|---|---|---|
| Poly(trimethylsilylpropyne) | 4100 | 2.05 | 0.98 | [30] | 5 |
| Poly(trimethylsilylpropyne) | 6500 | 1.03 | 0.433 | [31] | 74 |
| Substituted Poly(diphenylacetylene) | 11200 | 0.97 | 0.38 | [25] | 33 |
| Substituted Poly(diphenylacetylene) | 15800 | 1.01 | 0.46 | [25] | 33 |
| Substituted Poly(diphenylacetylene) | 12800 | 1.07 | 0.46 | [25] | 33 |
| Substituted Poly(diphenylacetylene) | 17800 | 1.07 | 0.51 | [25] | 33 |
| Substituted Poly(diphenylacetylene) | 13700 | 1.05 | 0.47 | [25] | 33 |
| Isotactic poly(methyl methacrylate) (PMMA) | 3.75 | 2679 | – | [32] | 51 |
| Atactic PMMA | 9.43 | 806 | – | [32] | 51 |
| Syndiotactic PMMA | 9.57 | 736 | – | [32] | 51 |
| Poly(trichloromonochloroethylene) poly diacetylene (PDA) | 34.1 | 284 | – | [15] | 1384 |
| Nafion 117 | 40.9 | – | 401 | [33] | 93 |
| Poly(trichloromonochloroethylene) | 34.1 | – | 406 | [15] | 1384 |
| Tetramethyl bis polycarbonate | 206 | – | 43.8 | [15] | 1384 |
| Poly(vinyl alcohol) | 0.0071 | – | – | [34] | 67 |
| Poly(vinyl alcohol) | 0.052 | – | – | [15] | 1384 |
| 6FDA-DAF polyimide | 98.5 | – | 156 | [35] | 73 |
| 6FDA/tetramethyl PDA polyimide | 530 | 23.2 | – | [15] | 19 |
| Polyimide (6FDA-6FpDA:DABA (2:1)) | 142 | 65 | – | [36] | 31 |
| Polyimide | 396 | – | – | [15] | 1384 |
| Polypyrrolone (6FDA/PMDA (10/90)-TAB) | 22.5 | 622 | 3041 | [37] | 55 |
| Polypyrrolone (6FDA/PMDA (25/75)-TAB) | 35.7 | 364 | 1594 | [37] | 55 |
| Polypyrrolone (6FDA-TAB) | 166 | 64.4 | 184 | [37] | 55 |
| Polyarylate (TMHFBPA I/T) | 182 | 64.8 | – | [38] | 6 |
| Hyflon AD | 405 | 48.8 | 167 | [16] | 1186 |
| Hyflon AD60X | 476 | 50.3 | 157 | [39] | 43 |
| Teflon AF-2400 | 3600 | – | 6 | [40] | 153 |
| Teflon FEP | 62 | 25 | 44 | [7] | 70 |
| Viton E60 fluoroelastomer | 30.5 | – | – | [41] | 19 |
| Viton fluoroelastomer | 43.9 | – | – | [41] | 19 |
| Cytop | 170 | – | – | [16] | 1186 |
| Fluorinated polynorbornene | 185 | – | – | [42] | 20 |
| Hostaflon perfluoroalkoxy alkane (PFA) | 43.9 | 35.9 | 41.8 | [43] | – |
| Poly(tetrafluoroethylene-co-ethylene) | 5.63 | 30.9 | – | [43] | – |
| Poly(trifluorochloroethylene-co-ethylene) | 5.33 | 87.5 | – | [43] | – |
| Polyvinyl fluoride | 1.8 | 95 | 280 | [7] | 70 |
| Poly(vinyl fluoride) | 0.46 | 289 | – | [43] | – |
| Low density polyethylene (LDPE) | 4.92 | 5.06 | 1.68 | [41] | 552 |
| High density polyethylene (HDPE) | 1.14 | 7.8 | 2.97 | [41] | 552 |
| Poly(ethylene-co-propylene) | 31.9 | 6.49 | – | [42] | 14 |
| Poly(ethylene-co-propylene) | 29 | 5.31 | – | [42] | 14 |
| Poly(ethylene-co-propylene) | 21.3 | 4.32 | – | [42] | 14 |
| Poly(propylene) | 0.373 | 0.85 | – | [43] | – |
| Trespaphan | 14.1 | 25 | – | [44] | – |
| Trespaphan | 11.96 | 25.3 | – | [44] | – |
| Trespaphan | 10.25 | 25.2 | – | [44] | – |
| Trespaphan | 11.6 | 17.6 | – | [44] | – |
| Poly(styrene) | 18.64 | 23.73 | – | [45] | 17 |
| Polystyrene | 35 | 16 | 15 | [7] | 70 |
| Poly(ethyl methacrylate) | 6.9 | 30.5 | – | [43] | – |
| Poly(vinyl acetate) | 12.57 | – | 398 | [46] | 418 |
| Poly(trifluorochloroethylene) | 6.79 | 1360 | – | [47] | – |
| Poly(vinyl alcohol) | 0.001 | 7.5 | – | [47] | – |
| Poly(vinyl benzoate) | 8.88 | 53.79 | – | [48] | 95 |
| Poly(vinyl chloride) | 2 | 168.5 | 71.4 | [43] | – |
| Saran | 0.31 | 330 | 260 | [21,47] | 47 |
| Poly(butadiene) | 32.6 | 5.06 | – | [42] | 14 |
| Poly(butadiene-co-acryonitrile) | 16.9 | 6.7 | – | [49] | 213 |
| Poly(butadiene-co-acryonitrile) | 12.3 | 11.5 | – | [49] | 213 |
| Poly(butadiene-co-acryonitrile) | 9.85 | 16.3 | – | [49] | 213 |
| Poly(oxydimethylsilylene) | 233 | 1.03 | – | [43] | – |
| Nylon 6 | 0.53 | 55.8 | – | [47] | – |
| Cellulose acetate | 13.6 | 48.6 | – | [47] | – |
| Cellulose nitrate | 6.9 | 59.5 | – | [50] | 16 |
| Ethyl cellulose | 53.4 | 12.1 | – | [50] | 16 |
| Polyvinyl fluoride | 0.97 | 231 | – | [51] | 16 |
| Polyvinylidene chloride | 0.066 | 366 | – | [51] | 16 |
| Nylon 6 | 2.43 | 98.8 | – | [51] | 16 |
| Mylar | 1.002 | 167 | 170 | [21,51] | 16 |
| Polyethylene terephthalate | 2.967 | 206 | – | [51] | 16 |
| Cellulose acetate | 1990 | – | 11.8 | [26] | 13 |
| Silicone rubber | 356 | – | 0.34 | [26] | 13 |
| Phenylene silicone rubber | 150 | 3.8 | 0.75 | [7] | 70 |
| Nitrile silicone rubber | 79 | 3.8 | 0.79 | [7] | 70 |
| Polycarbonate | 67 | 15 | 19 | [7] | 70 |
| Trithene B | 34 | 280 | 400 | [7] | 70 |
| Ethyl cellulose | 31 | 11 | 4.9 | [7] | 70 |
| Ethylene-vinyl acetate | 21 | 7.5 | 1.9 | [7] | 70 |
| Viton A | 17 | 55 | 110 | [7] | 70 |
| Polyvinyl chloride | 14 | – | 7 | [7] | 70 |