A multilayer model is proposed which predicts the equilibrium sorption isotherms for pure gases in Part I and for binary gas mixtures in Part II. This first part deals with the sorption of a pure gas or vapor, particularly by polymers. The model and equations are significantly different from those presently most used.
The model gives good fits to the data against which it has been tested, particularly when used with sigmoidal isotherms. It allows the thermodynamic parameters to be calculated and gives important knowledge about the distribution and location of sorbed species.
Get full access to this article
View all access options for this article.
References
1.
AndersonR. B., Modifications of the BET Equation I, J. Amer. Chem. Soc.68, 686–691 (1946).
2.
AndersonR. B.HallW. K., Modifications of the BET Equation II, J. Amer. Chem. Soc.70, 1727–1734 (1948).
3.
BrunauerS.EmmettP. H.TellerE., Adsorption of Gases in Multimolecular Layers, J. Amer. Chem. Soc.60, 309–319 (1938).
4.
BullH. B., Adsorption of Water Vapor by Proteins, J. Amer. Chem. Soc.66, 1499–1507 (1944).
5.
BunnC. W.GarnerE. V., The Crystal Structures of Two Polyamides (‘Nylons’), Proc. Roy. Soc., A 39–68, 189 (1947).
6.
ChamberlainN. H.SpeakmanJ. B., Hysteresis Phenomena in the Absorption of Water by Human Hair, Z. Elektrochem.37, 374–375 (1931).
7.
DoleM., Statistical Thermodynamics of the Sorption of Vapors by Solids, J. Chem. Phys.16.1, 25–30 (1948).
8.
FarrowF. D.SwanE., Absorption of Water by Dried Films of Boiled Starch, J. Textile Inst.14, T 465–474 (1923).
9.
GoodingsA. C.TurlL. H., The Density and Swelling of Silk Filaments in Relation to Moisture Content, J. Textile Inst.31, T69–80 (1940).
10.
HailwoodA. J.HorrobinS., Absorption of Water by Polymers, Trans. Farad. Soc.42B, 84–102 (1946).
11.
HillT. L., Statistical Mechanics of Multimolecular Adsorption I, J. Chem. Phys.14.4, 263–267 (1946).
12.
HillT. L., “Introduction to Statistical Thermodynamics,”Addison-Wesley, Reading, Mass. 1960, pp. 134–135.
13.
HillT. L., Theory of Multimolecular Adsorption from a Mixture of Gases, J. Chem. Phys.14.4, 268–275 (1946).
14.
JeffriesR., The Sorption of Water by Cellulose and Eight Other Textile Polymers II, J. Textile Inst.15, T399–418 (1960).
15.
LangmuirI., The Adsorption of Gases on Plane Surfaces of Glass, Mica and Platinum, J. Amer. Clam. Soc.40, 1361–1403 (1918).
16.
SpeakmanJ. B., The Rigidity of Wool and Its Change with Adsorption of Water Vapor, Trans. Farad. Soc.25, 92–103 (1929).
17.
StattonW. O., Polymer Texture: The Arrangement of Crystallites, J. Polym. Sci.41, 143–155 (1959).
18.
UrquhartA. R.WilliamsA. M., The Moisture Relations of Cotton I, J. Textile Inst.15, T138–148 (1924).
19.
UrquhartA. R.WilliamsA. M., The Moisture Relations of Cotton II, J. Textile Inst.15, T433–442 (1924).
20.
VermaasD., Discussion to “Absorption of Water by Polymers,”Trans. Farad. Soc.42B, 97–99 (1946).
