1965 Volume 38 Issue 11 Pages 1852-1857
Cationic polysoap (SP-100, mol. wt. 2770), consisting of a short polymer chain with -chemically-attached soap-like groups, has been prepared by quaternizing N-dodecylpiperidine with polyallyl chloride (mol. wt. 647). Some properties of the aqueous solution of SP-100 has been investigated by the light-scattering and surface-tension methods in the absence of and in the presence of sodium chloride.
We have found that the solution of such a polysoap exhibited the CMC value and that the concentration was 3.64×10−4 mol./l. (light scattering).
When the logarithmic relation between the CMC and the total gegen ion concentration was plotted, the curve thus obtained could be divided into two regions. Namely, the curve was almost flat at lower total gegen ion concentrations, followed by a depressed portion.
The micellar weight of SP-100 was 18800 in water and 32300 in a 0.3 M sodium chloride solution. The charges of SP-100 in aqueous solutions were calculated from the slope of the Debye plots by the derived equation of Princen and Mysels; on the basis of these results, the micellar charge of SP-100 in water is quite small.
The surface excess (Γ2), together with the corresponding surface area (A), of SP-100 at the air-solution interface has been calculated from the slopes of the surface tension vs. the logarithm of polysoap concentration curve slightly below the CMC by applying the Gibbs equation. The Γ2 value thus obtained was 3.78×10−10mol./cm2, while A was 44Å2/mol. The Γ2 value of SP-100 in mol./cm2 was of nearly the same order of magnitude as those of ionic monosoaps.
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