Sodium dinonylnaphthalene

Fig. 14. Aggregation number (n) of sodium dinonylnaphthalene sulfonate versus solubility parameter of the solvents. (J. Phys. Chem. 68, 3453 (1964)1...

Bis(2-ethylhexyl) sebacate containing 1% of sodium dinonylnaphthalene sulfonate... 

Unlike aqueous surfactant solutions in which micellar size and shape may vary considerably, small spherical micelles appear to be the most favored, especially when the reduction of solvent-polar group interactions is important. In much the same way as in water-based systems, geometric considerations often play an important role in determining micelle size and shape. Many materials that commonly form nonaqueous micellar solutions possess large, bulky hydrocarbon tails with a cross-sectional area significantly greater than that of the polar head group. Typical examples of such materials are sodium di-2-ethylhexylsulfosuccinate and sodium dinonylnaphthalene sulfonate ... 

In particular, Fig. 14 shows that the sodium dinonylnaphthalenesulfonate aggregates decrease in size approximately linearly with increasing solubility parameters between 6.5 and 10. According to Little135 the barium dinonylnaphthalene sulfonate (which forms spherical micelles independent of concentration) also obeys a linear relation between micelle size and the solubility parameters (see Fig. 15). Actually, quite a number of authors recommend this relationship, for example117,118,124 142 as the most reliable and appropriate one. It should be noted,... 

Sodium petroleum sulphonates or calcium dinonylnaphthalene sulphonate can be applied as rust preventing additives and the catalytic effect of copper can be retarded by 2-mercaptobenzothiazole. Depending on operating temperature, various oxidation inhibitors may be used. Thus, 2,6-di-fert-butyl-4-methyl phenol is an effective inhibitor below 120 C while phenyl-alpha-naphthylamine is widely used in greases at low temperatures and above 120" C and phenothiazine is effective especially at temperatures above 150" C. Special compounds used as oxidation inhibitors for greases in the food industry are dilauryl thiodipropionate or citric acid. 

Soap Adsorbates. The barium salt of dinonylnaphthalene sulfonic acid, Ba(DNNS)2, was prepared by metathesis of the sodium salt with barium chloride [3]. 

Solubilization studies on small organic molecules, such as methanol, acetic acid, and propylamine, by non-aqueous solutions of sodium and H>tassium dinonylnaphthalene sulphonates, and magnesium phenyl stearates have been reported [194, 214]. Bascom and Singleterry [213] indicated that in the initial stages of the uptake the solubilizate was co-ordinated by the cation. For methanol, which was solubilized to a larger extent than the other compounds at high concentrations, association with the hydrocarbon chains of the surfactant occurred. For this solubilizate there was some evidence of a decrease in micelle size on solubilization. A similar picture of a two-stage process in solubilization was apparent for acetic acid. 

---