Excess molar volumes and partial molar volumes of dipropylene glycol monomethyl ether plus n-alkanol mixtures at 25 degrees C

The excess molar volumes VE for binary liquid mixtures containing dipropyle ne glycol monomethyl ether and methanol, ethanol, 1-propanol, 1-butanol, 1- pentanol, 1-hexanol, and 1-heptanol have been measured using a continuous d ilution dilatometer over the whole mole fraction range at 25 degreesC at at mospheric pressure. V-E are negative over the whole composition range excep t for the systems containing 1-pentanol, 1-hexanol, or 1-heptanol which are positve at every composition. V-E increases in a positive direction with i ncrease in chain length of the n-alcohol. The results have been used to est imate the excess partial molar volumes (V) over bar (E)(i) of the component s. The change of V-E and (V) over bar (E)(i) with composition and the numbe r of carbon atoms in the alcohol molecule are discussed as a basis to under stand some of the molecular interactions present in the mixtures.