Excess molar volumes of binary mixtures of hexanol and polyethers at 25°C

Excess molar volumes V-m(E) at 25 degreesC and atmospheric pressure over the entire composition range for binary mixtures of 1-hexanol with n-polyethers: 2,5-dioxahexane, 3,6-dioxaoctane, 2,5,8-trioxanonane, 3,6,9-trioxaundecane. 5,8,11-trioxapentadecane. 2,5, 8,11-tetraoxadodecane, and 2,5,8,11,14-pentaoxapentadecane are reported from densities measured with a vibrating-tube densimeter. Systems containing 2,5-dioxahexane, 2,5,8-trioxanonane, 2,5,8,11-tetraoxadodecane or 2,5,8,11,14-pentaoxapentadecane are characterized by V-m(E) > 0, probably due to predominant positive contributions to V-m(E) from the disruption of H bonds of 1-hexanol and to physical interactions. In contrast, mixtures with 3,6-dioxaoctane, 3,6,9-trioxaundecane. and 5,8,11-trioxapentadecane are characterized by V-m(E) < 0, indicating that the negative contribution to V-m(E) from interstitial accommodation is more important.