Excess molar volumes of binary mixtures of 1-heptanol or 1-nonanol with n-polyethers at 25 degrees C (original) (raw)

2000, Journal of Solution Chemistry

Excess molar volumes V E m at 25ЊC and atmospheric pressure over the entire composition range for binary mixtures of 1-heptanol with 2, 5-dioxahexane, 2,5,8trioxanonane, 5,8,11-trioxapentadecane, 2,5,8,11-tetraoxadodecane, or 2,5,8, 11,14-pentaoxapentadecane, and mixtures of 1-nonanol with 2,5-dioxahexane, 3,6-dioxaoctane, 2,5, 8-trioxanonane, 3,6,9-trioxaundecane, 5,8,11-trioxapentadecane, 2,5,8,11-tetraoxadodecane, or 2,5,8,11,14-pentaoxapentadecane are reported from densities measured with a vibrating-tube densimeter. V E m curves are nearly symmetrical at about 0.5 mole fraction. Excess molar volumes are usually positive, indicating predominance of positive contributions to V E m from the disruption of H bonds of alcohols and from physical interactions. When chain lengths of both components of the mixture are increased, the contribution from interstitial accommodation appears to be sufficiently negative, such that V E m becomes negative (e.g., l-nonanol ϩ 5,8,11-tetraoxapentadecane).