Excess thermodynamic properties of (2-ethoxyethanol+1,4-dioxane or 1,2-dimethoxyethane) at temperatures between (283.15 and 313.15) K

Measurements of the excess enthalpies H-E at T = 298.15 K and densities at 15 K intervals from T = (283.15 to 313.15) K are reported for (2-ethoxyetha nol + 1,4-dioxane or 1,2-dimethoxyethane). Excess volumes V-E, excess therm al expansivities alpha(E), and the pressure derivatives of the excess entha lpies were estimated from the measured densities. The values of H-E for bot h systems are positive, However, the values of V-E for the 1,2-dimethoxyeth ane system are negative, although they are positive for the 1,4-dioxane sys tem as expected from the sign of H-E. The behaviour of these properties is discussed in terms of hydrogen bonds and size and shape of the ether molecu les. (C) 2000 Academic Press.