Sage Journals: Discover world-class research

Abstract

A simple and sensitive method for measuring CO₂ permeability in polymer films has been developed. The method is based on the use of ¹⁴CO₂. At time zero ¹⁴CO₂ is injected on the high pressure side of the cell. Permeation is monitored with a Geiger counter which senses ¹⁴CO₂ on the low pressure side of the cell. The counts/time on the low pressure side are proportional to the total concentration of CO₂ which has diffused through the film. With the known source concentration the volume-time curve is constructed and the permeability and time lag are calculated. The system sensitivity as it is presently configured is on the order of 10^-15 em³(STP).cm/cm².sec.cm Hg. Results are presented for a measurement of a 0.025 cm polycarbonate film.

Get full access to this article

View all access options for this article.

References

Crank, J. The Mathematics of Diffusion. 2nd Edition, Oxford:Clarendon Press, pp. 44-53 (1975).

Paul, D.R. J. Poly Sci. A-2, 7:1811 (1969).

Paul, D.R. and W.J. Koros. J. Poly Sci Pol Physics Ed., 14:675 (1976).

Koros, W.J. , D.R. Paul and A.A. Rocha. J. Poly Sci Pol Physics Ed., 14:687 (1976).

Chan, A.H. and D.R. Paul. Poly Eng and Sci., 20(1):87 ( 1980).

Koros, W.J. , A.H. Chan and D.R. Paul. J. Membrane Science, 2:165 (1977).

Wonders, A.G. and D.R. Paul. J. Membrane Science, 5:63 ( 1979).

Measurement of Co2 Permeability in Polymer Films

Abstract

Get full access to this article

References