EXCESS MOLAR ENTHALPIES AND EXCESS MOLAR VOLUMES OF BINARY-MIXTURES CONTAINING PARAXYLENE + CYCLIC ETHERS

Excess molar enthalpies H(E) , and excess molar volumes V(E), of mixtures of p-xylene with the cyclic ethers oxolane, oxane, 1,3-dioxolane, and 1,4-dioxane have been determined by means of a flow microcalorimeter and a digital density meter at 298.15 K and atmospheric pressure. The experimental values are correlated by polynomial equations. V(E) is positive over the entire range of mole fractions for p-xylene-1,4-dioxane, but is negative for the other mixtures. H(E) is positive for the mixtures involving the diethers 1,3-dioxolane and 1,4-dioxane, and negative for the monoethers. The heat effects are qualitatively discussed in terms of molecular interactions.