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

Excess molar volumes V^E 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 V^E 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 V^E decreases as the chain length of the 1-alcohol increases. For each 1-alcohol, the V^E increases as the chain length of the symmetrical di-n-alkyl ethers increases. Moreover, for the butyl methyl ether (an asymmetrical monoether), the V^E is more positive than of the immediately higher symmetrical dipropyl ether. These results, together with previously published excess molar enthalpies H^E, suggest the formation of hydrogen bonds between the functional group (---OH) of the 1-alcohol and the (---O---) atoms of the monoethers.