Effects of structural variations of non-ionic surfactants on micellar properties and solubilization: surfactants containing very long hydrocarbon chains

Article abstract of DOI:10.1111/j.2042-7158.1981.tb13736.x

Polyoxyethylene mono-ethers of dotriacontanol (C₃₂E₄₁) and 4,9-dimethyltritriacontanol (C₃₅E₄₀) have been synthesized. The micellar weights in water at 298K were 4.82 x 10⁵ and 5.90 x 10⁵, the aggregation numbers 212 and 260, and the levels of hydration 290 and 283 mol water mol^-1 surfactant, respectively. The solubilization of azobenzene, cortisone acetate, griseofulvin, sulphadiazine, phenylbutazone, betamethasone, tolbutamide, and menaphthone was studied in 2% solutions of the above surfactants. The presence of large micelles did not result in increased solubilization; C₃₂E₄₁ and C₃₅E₄₀ had a lower solubilizing capacity than that of cetomacrogol.