Thermochimica Acta, Vol.254, 347-357, 1995
Volumetric Properties of Binary-Mixtures of Water with Ethanolamine Alkyl Derivatives
Accurate densities for binary mixtures of water + N,N-dimethylethanolamine, and + N,N-diethylethanolamine were measured at different temperatures. The molar excess volumes V-E of the mixtures and the apparent molar volumes of both components have been derived as functions of the composition. The V-E values are negative over the entire composition range at various temperatures. Compared with monoethanolamine itself, the introduction of two methyl or ethyl groups into it leads to more negative V-E values. The results are discussed in terms of specific interactions present in the binary mixtures and a comparative study is made between the methyl and ethyl ethanolamine derivatives.