RT info:eu-repo/semantics/article
T1 Orientational effects in mixtures of organic carbonates with alkanes or 1-alkanols
A1 González López, Juan Antonio Mariano
A1 Hevia de los Mozos, Luis Fernando
A1 Alonso Tristán, Cristina
A1 García de la Fuente, Isaías Laudelino
A1 Cobos Hernández, José Carlos
K1 Termodinámica
K1 2213 Termodinámica
AB Interactions and structure of organic carbonate + alkane, and 1-alkanol + organic carbonate mixtures have been investigated by means of a set of  molar excess functions, enthalpies (H_m^E), volumes (V_m^E), isobaric  heat capacities, (C_pm^E) or entropies; and considering internal pressure (P_int); liquid-liquid equilibria or permittivity  data. In addition, the mentioned systems have been studied using the Flory model and the concentration-concentration structure factor,S_CC (0), formalism. The mixtures under consideration are characterized by dipolar interactions and by homocoordination (that is, by interactions between like molecules). In systems with a given solvent, dipolar interactions are weakened in the order:  propylene carbonate (PC) > dimethyl carbonate (DMC) > diethyl carbonate (DEC).  Comparison of mixtures containing DMC or DEC with those involving 2-propanone or 3-pentanone shows that dipolar interactions are not determined merely by values of the dipole moment, but they also depend on the size group.  The enthalpies of the alkanol-carbonate interactions have been evaluated from calorimetric data. They are stronger in DMC solutions, and become weaker when the alcohol size increases in mixtures with a given carbonate. Application of the Flory model to 43 systems of the type 1-alkanol + carbonate provides a mean relative standard deviation for H_m^E equal to 0.107. Results reveal that orientational effects decrease in the order DEC > PC > DMC. Orientational effects are particularly relevant in methanol or ethanol + DEC mixtures. Interestingly, the mentioned effects are weaker in 1-alkanol + DMC mixtures than in DMC + alkane systems. A similar trend is observed in DEC solutions when the considered alcohol is longer than ethanol.
PB Elsevier
SN 0378-3812
YR 2017
FD 2017
LK https://uvadoc.uva.es/handle/10324/69218
UL https://uvadoc.uva.es/handle/10324/69218
LA spa
NO Fluid Phase Equilibria, 2017, 449, 91-103
DS UVaDOC
RD 15-ago-2025