Excess molar volumes of 1-alcohol + aliphatic monoethers at 298.15 K

Excess molar volumes VE at 298.15 K and atmospheric pressure for 1-propanol and 1-hexanol + butyl methyl ether, + dipropyl ether or + dibutyl ether with a vibrating-tube densimeter. The VE are negative over the whole mole-fraction range and nearly have been calculated from densities measured symmetrical for all the systems investigated. For each monoether, the VE decreases as the chain length of the 1-alcohol increases. For each 1-alcohol, the VE increases as the chain length of the symmetrical di-n-alkyl ethers increases. Moreover, for the butyl methyl ether (an asymmetrical monoether), the VE is more positive than of the immediately higher symmetrical dipropyl ether. These results, together with previously published excess molar enthalpies HE, suggest the formation of hydrogen bonds between the functional group (OH) of the 1-alcohol and the (O) atoms of the monoethers.