Abstract
The densities of aqueous solutions of ((dodecyloxy)methyl)-18-crown-6 (C12-OM-crown) were measured at various temperatures (5−45 °C). The partial molar volume of the micelles at infinite dilution (Vm°) in water increased linearly with the temperature below the cloud point (tc = 30.5 °C) of aqueous C12-OM-crown solutions from 443.7 cm3/mol at 5 °C to 452.9 cm3/mol at 25 °C. C12-OM-crown micelles seemed to be more bulky than micelles of conventional nonionic surfactants having an oligo(oxyethylene) chain, because of a cyclization effect of the chain. Vm° increased upon the addition of KCl. In 0.5 mol/dm3 KCl systems, the Vm°−temperature (T) plot comprised two linear sections with a break point at around 25 °C, one of which at over 25 °C nearly agreed with the extrapolated line of the Vm°−T relation for a no-salt system. The agreement seems to imply a certain compensation effect on the molar volume of partially chelated mixed micelles, since the difference (4.1 cm3/mol) in Vm° at 5 °C between water and 0.5 m...
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