Components:

(1) Methane, CH₄; [74-82-8] NIST WebBook
(2) Polycarbonate, None; [25037-45-0] NIST WebBook

Original Measurements

Pope, D. S.; Feming, G. K.; Koros, W. J.; Macromolecules 23, 2988 (1990).

Variables:

Ambient temperature: 308 K
Pressure: 0 - 6.89 MPa

Prepared by:

Yu.P. Yampol'skii

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. Both isotherms were obtained by the pressure decay method.¹ Exchange conditioning involved exposing the samples to CO₂ gas and then sweeping it by a CH₄ flux with the subsequent gravimetric determination of sorption.

Source and Purity of Materials:

1. CH₄: purity >99.99%. PC: General Electric Co., density 1.200 g/cm³, glass transition temperature 423 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.