Components:
(1) Methane,
CH4; [74-82-8]
NIST WebBook
(2) Tetramethylpolycarbonate,
None; [38797-88-5]
NIST WebBook
Original Measurements
Pope, D. S.; Feming, G. K.; Koros, W. J.; Macromolecules 23, 2988 (1990).
Variables:
Ambient temperature: 308 K
Pressure: 0 - 5 MPa
Prepared by:
Method/Apparatus/Procedure:
Two methods of conditioning were studied. Conventionally conditioned isotherms were obtained with the samples which had been previously in contact with CO2 gas under pressure of 6.21 MPa for 2-3 h with consequent pumping for 2 days. Exchange conditioning runs a gravimetric technique was used. In two other types of experiments a pressure decay method was applied.1
Source and Purity of Materials:
- CH4 purity 99.99%. TMPC: Dow Chemical Co., density 1.08 g/cm3, glass transition temperature 476 K.
Estimated Errors:
Ambient temperature: No information given.
References
1 Koros, W. J.; Paul, D. R.; J. Polym. Sci., Polym. Phys. Ed., 1976, 14, 1903.
Experimental Values:
Sorption isotherms of methane at 308 K in unconditioned , conventionally conditioned, and exchange-conditioned samples of TMPC (The original data were represented graphically)
| P (MPa) | Sorption (V1/V2) |
|---|---|
| 4.2 x 10-1 | 4.82 |
| 9.3 x 10-1 | 8.25 |
| 1.49 | 11.04 |
| 2.05 | 13.2 |
| 2.6 | 15.15 |
| 3.12 | 16.79 |
| 3.72 | 18.52 |
| 4.31 | 20.04 |
| 4.94 | 21.45 |
| 7.2 x 10-1 | 9.44 |
| 1.77 | 15.67 |
| 2.89 | 20.73 |
| 3.83 | 24.11 |
| 4.87 | 27.17 |
| 5.2 x 10-1 | 9.25 |
| 1.07 | 14.9 |
| 1.77 | 20.21 |
| 2.47 | 24.26 |
| 3.06 | 26.84 |
| 3.8 | 29.83 |
| 4.48 | 32.29 |
