Components:
(1) Carbon dioxide,
CO2; [124-38-9]
NIST WebBook
(1) Methane,
CH4; [74-82-8]
NIST WebBook
(2) Polystyrene,
(C8H8)n; [9003-53-6]
NIST WebBook
Original Measurements
Raymond, P. C.; Paul, D. R.; J. Polym. Sci. B: Polym. Phys. 28, 2079-2102 (1990).
Variables:
Ambient temperature: 308 K
Pressure: 0 - 2.5 MPa (0 - 25 atm)
Prepared by:
Method/Apparatus/Procedure:
Gas sorption measurement was performed using the same equipment and procedure as in ref.1. Sorption isotherms for methane were obtained using polymer samples which had never been exposed to CO2. The CO2 isotherm was obtained using the samples that had been conditioned in CO2 at 25 atm for 24 h.
Source and Purity of Materials:
- PS (Cosden Oil 550) had a density 1.052 g/cc and the glass transition temperature 373 K. No information on gas purity given.
References
Experimental Values:
Table 1. Sorption C/(cm3(STP)/cm3) of methane and carbon dioxide in PS*
| P (atm) | Sorption (g2/100 g1) |
|---|---|
| 5.0 | 1.5 |
| 10.0 | 2.6 |
| 15.0 | 3.6 |
| 20.0 | 4.4 |
| 25.0 | 5.3 |
| 5.0 | 6.7 |
| 10.0 | 11.1 |
| 15.0 | 14.6 |
| 20.0 | 17.6 |
| 25.0 | 20.0 |
(*) Smoothed data taken from the plot by the compiler.
Table 2. Dual mode sorption parameters
| H (cm3(g) cm-3(s) atm-1) | C'H (cm3/cm3) | b (atm-1) |
|---|---|---|
| 1.35 x 10-1 | 3.28 | 6.1 x 10-2 |
| 5.35 x 10-1 | 8.63 | 1.94 x 10-1 |
