A Study of the Vapor-Pressure Diminution of Rubber Jellies

Methods and results of measurement of vapor-pressure lowering of rubber jellies are described. From the qualitative behavior of the jellies (consistency), from the shape of the curve given in Fig. 3, and from approximate calculations of the thickness of the solvent layer round the molecules, it is assumed that the solvent is bound by the molecules of the jelly in the form of a solvated layer. The existence of such a layer in the sphere of action of the molecules explains sufficiently a decrease of activity of solvents, which results in vapor-pressure lowering, swelling pressure, etc., and makes the process similar to that of solution.