No abstract

Dielectric relaxation technique (10+6−10-3 Hz) and differential scanning calorimetry are used to study the existence of clathrate hydrates in aqueous solutions of a number of alcohols and non hydrogen-bonded liquids. The aqueous solutions studied are those of methanol, ethanol, 2-propanol, tert-butyl alcohol, acetone, and p-dioxane. The corresponding solid−liquid phase diagrams are also determined to support the dielectric results. Evidence for the existence of clathrate hydrates in 2-propanol and tert-butyl alcohol is provided. The clathrate hydrate of 2-propanol is metastable. No clathrate structure is found in methanol mixtures. The composition of the new clathrate found in 2-propanol and tert-butyl alcohol is suggested to be around A. 5H2O−A. 6H2O. The clathrate hydrate relaxation (including that of the two hydrates of ethanol) has been studied down to its kinetic freezing temperature T g and is analyzed in terms of the Arrhenius equation. Also studied are the relaxation rates of the clathrate hydrates of acetone, tetrahydrofuran, and p-dioxane down to their respective T gs. The nature of the dielectric relaxation is discussed.

No abstract

No abstract

No abstract