Viscosities for binary liquid mixtures of n-alkoxyethanols with water at 298.15K

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 eta(E)) and excess energies of activation for viscous flow (Delta G*(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 d(12) have been calculated from the relation ln eta(m) = x(1)ln eta(1), + x(2)ln eta(2) + x(1) x(2) d(12), where eta(1) and eta(2) refer to the dynamic viscosities of the two pure liquids 1 and 2 whose mole fractions in the mixture are x, and x, respectively. The results for ln eta(E), Delta G*(E) and d(12) are discussed in terms of interactions of water with an amphiphilic molecule.