Excess Volume of Mixtures of Oxaalkanes and Branched Alkanes

Equimolar values of the excess volume, V E , have been obtained at 25 °C for a series of oxaalkanes, 2,5-dioxahexane, 2,5,8-trioxanonane, 2,5,8,11-tetraoxadodecane, and 2,5,8,11,14-pentaoxapentadecane, mixed with a series of highly-branched alkanes: 2,2-dimethylbutane, 2,2,4-trimethylpentane, 2,2,4,6,6-pentamethylheptane, and 2,2,4,4,6,8,8-heptamethylnonane. The Prigogine-Flory thermodynamic theory predicts the large variations of V E with the chain-lengths of the molecules in the two series.