Thermoynamic properties (HmE, CP,mE, VmE, κTE) of binary mixtures {x1,3-Dioxane + (1−x)Cyclohexane} at 298.15 K

Excess enthalpies and excess heat capacities of binary mixtures of (cyclohexanone, or 2-butanone, or 1,4-dioxane+ 1,2-dimethoxyethane) and (1,4-dioxane + 1,2-dimethoxyethane) atT= 298.15 K

“…In alkane mixtures also, 1,4-dioxane behaves as if it were a polar liquid and gives a W-shaped curve for C E p,m . (8,17) A similar W-shaped curve was observed in {xcyclohexanone + (1 − x)2-butanone}. (2) …”

Thermodynamic properties of (1,3 -dioxane, or 1,4-dioxane + a non-polar liquid) atT= 298.15 K; speed of sound, excess isentropic and isothermal compressibilities and excess isochoric heat capacity

“…The behaviour of C E V,m curves of these system is very similar to those of cyclohexane systems (1) and show a positive tendency in the middle region of concentration due to non-randomness. However, they are more negative than those of cyclohexane systems.…”

“…(3) On the other hand, (1,3-dioxane, or 1,4-dioxane + cyclohexane) are typical of another system of "non-randomness" and show positive κ E S and κ E T according to positive V E m . (1) The reason may be that the values of V E m of (1,3-dioxane, or 1,4-dioxane + 2,2,4-trimethylpentane systems are less than a half of those of the cyclohexane systems because of the more flexible configuration of the former molecule than the latter one, and that the 2,2,4-trimethylpentane) systems cannot afford to be compressed due to bulkiness of 2,2,4- …”

“…using κ S calculated by using equation (1), the molar volume V m and thermal expansivity α of the mixture calculated from the excess molar volume V E m and excess thermal expansivity α E of the mixture (3) and the isobaric molar heat capacity C p,m of the mixture calculated from the excess isobaric molar heat capacity C E p,m of the mixture. (4) The isochoric molar heat capacity C V,m of the mixture was estimated using …”

“…(1)(2)(3)(4) In the report of the thermodynamic properties of (cyclohexane + dioxane isomers), we found that non-polar 1,4-dioxane shows polar properties similar to 1,3-dioxane, due to local dipole moments due to bond dipole. (1) We have also reported the excess molar enthalpies H E m , (2) excess molar volumes V E m , (3) excess thermal expansivities α E , (3) and excess molar isobaric heat capacities C E 298.15 K. The non-polar solvents were selected by showing different intermolecular interactions: 2,2,4-trimethylpentane is a typical aliphatic non-polar solvent; tetrachloroethene has a π interactive site and symmetrical bond dipoles (Cl-C), and benzene is a typical aromatic, showing an induced dipole-dipole interaction with polar solvents. The difference in thermodynamic properties due to different intermolecular interaction is discussed in these papers.…”