Viscosities for binary liquid mixtures of <i>n</i>-alkoxyethanols with water at 298.15K

Abstract

Viscosities at 298.15 K for three alkoxyethanol+water mixtures have been measured over the whole mole fraction range by using an Ubbelohde viscometer . The alkoxyethanol was 2-(2-methoxyethoxy)ethanol or 2-(2- ethoxyethoxy)ethanol or 2-(2-butoxyethoxy)ethanol. From the experimental data, excess logarithmic viscosities (In η^E) and excess energies of activation for viscous flow (<img src='/image/spc_char/delta.gif' border=0><i>G</i>*E) have been calculated. The excess functions are positive over the entire range of composition for all the systems studied. Also the values of parameter <i>d₁₂ </i> have been calculated from the relation ln η_m = x₁ln η₁ + x₂In η₂ + <i>x</i>₁<i>x</i>₂<i>d</i>₁₂<i>, </i> where η₁ and η₁₂ refer to the dynamic viscosities of the two pure liquids 1 and 2 whose mole fractions in the mixture are <i>x</i>₁ and <i>x</i>₂ respectively. The results for In η^E, <img src='/image/spc_char/delta.gif' border=0><i>G*E</i> and <i>d₁₂ </i> are discussed in terms of interactions of water with an ampbipbilic molecule.