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Densities, ρ, dynamic viscosities, η, refractive indices, nD, and heat capacities, Cp, for the binary mixtures containing four block-copolymers [poly(ethylene glycol)−poly(propylene glycol)−poly(ethylene glycol)] (Mn = 1100, Mn = 1900, Mn = 2000, and Mn = 2800) + dimethyl sulfoxide were determined at (298.15 and 313.15) K and at atmospheric pressure using an Anton Paar density meter, a Schott-Gerate AVS viscometer, an Abbe refractometer, and a Perkin-Elmer differential scanning calorimeter. Volume variations, ΔV, during mixing and deviations of the dynamic viscosities, Δη, were obtained at these temperatures and are negative for all mixtures. Experimental data were fitted to the Redlich−Kister equation, and the adjustable parameters and the standard deviations between experimental and calculated values were estimated.

Molar heat capacities, C,, densities, p, dynamic viscosities, eta, and refractive indices, no, for the binary mixtures poly(ethylene glycol) 200 and poly(ethylene glycol) 400 + 2-methyltetrahydrofuran (MTHF) were determined at (293.15, 303.15, and 313.15) K using a Perkin-Elmer differential scanning calorimeter, an Anton Paar density meter, a Schott-Gerate AVS unit, and an Abbe refractometer, respectively. Excess molar volumes, V-m(E), deviations of the dynamic viscosities, Delta eta, and deviations of the refractive indices, Delta R, were calculated at these temperatures. These properties were fitted to the Redlich-Kister equation.

Excess molar enthalpies and heat capacities of dimethyl sulfoxide + 1,4-dioxane, dimethyl sulfoxide + 1,3-dioxolane, dimethyl sulfoxide + tetrahydropyran, dimethyl sulfoxide + tetrahydrofuran, dimethyl sulfoxide + 1,2-dimethoxyethane, and dimethyl sulfoxide + 1,2-diethoxyethane have been measured at 308.15 K and at atmospheric pressure using an LKB micro-calorimeter and a Perkin-Elmer differential scanning calorimeter. Heat capacities of pure components were determined in the range (293.15 T / K

Excess molar enthalpies, molar heat capacities, densities, viscosities, and refractive indices of dimethyl sulfoxide + 1-propanol have been measured at (288.15, 298.15, and 308.15) K and at normal ...

Excess molar enthalpies, , excess molar volumes, , and refractive indices, nD, for the binary mixtures anisole or phenetole + benzyl alcohol, + 2-phenylethanol, and + 3-phenyl-1-propanol have been determined at 308.15 K and at atmospheric pressure using an LKB flow microcalorimeter, an Anton Paar density meter, and an Abbe refractometer, respectively. A Redlich−Kister-type equation was used to correlate the experimental data and to derive the adjustable parameters and the standard deviations. The experimental and calculated quantities were used to study the nature of the mixing behavior between mixture components.

Excess molar enthalpies, , of binary liquid mixtures containing as component 1 ethylene glycol, propylene glycol, di(ethylene glycol), tri(ethylene glycol), tetra(ethylene glycol), or some PEGs, such as PEG200, PEG300, PEG400, PEG600, and 2-phenylethyl alcohol (2), have been measured over the entire range of mole fraction x1 at 308.15 K and at atmospheric pressure, using a flow microcalorimeter. The values of vary from a value of −600 J·mol-1 (mixture containing PEG600) up to a maximum of 254 J·mol-1 (mixture containing propylene glycol) decreasing as the chain length of glycols or PEGs increase. Curves are not symmetric, and in the case of mixtures containing PEGs, an intersection among the curves at x1 ≈ 0.65 has been observed. Results were fitted to the Redlich−Kister polynomial to estimate the adjustable parameters and the standard deviations between experimental and calculated values. Qualitative discussion of H bonding in the liquid state is given.

Excess molar enthalpies, H m E , of binary mixtures of anisole+glycols and polyglycols were measured by a flow microcalorimeter at 308.15 K and at atmospheric pressure over the whole composition range. Binary mixtures contained anisole+diethylene glycol, anisole+triethylene glycol, anisole+tetraethylene glycol, anisole+poly(ethylene glycol)-200, anisole+poly(ethylene glycol)-300, anisole+poly(ethylene glycol)-400, anisole+poly(ethylene glycol)-600. Effects of the molecular weight distribution (MWD), of the polymer were investigated too, by preparing three additional samples of poly(ethylene glycol) (PEG) with the same number average molecular weight ( M n ≈300), but different MWD. Values of H m E of the corresponding binary mixtures with anisole were measured. For all mixtures, results were fitted to the Redlich–Kister polynomial. H m E curves are asymmetrical, showing positive deviations for mixtures containing glycols and poly(ethylene glycol)-200, negative deviations for poly(ethylene glycol)-600, and an inversion of sign in the other cases. Values of H m E vary from a maximum of 440 J mol −1 (anisole+triethylene glycol) to a minimum of −390 J mol −1 (anisole+poly(ethylene glycol)-600). Effects of changes in the glycols chain length and in MWD on the molecular interactions between the mixture components are discussed.

Excess molar enthalpies, H-m(E), were determined as a function of molar fraction at 308.15 K and at atmospheric pressure for the binary mixtures containing dimethyl sulfoxide with ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, poly(ethylene glycol)-200, poly(ethylene glycol)-300, poly(ethylene glycol)-400, and poly(ethylene glycol)-600. All curves are negative over the entire composition range with minima ranging from -430 J.mol(-1) (propylene glycol) up to -1080 J.mol(-1) (poly(ethylene glycol)-600). The results were correlated using the Redlich-Kister polynomial, and the adjustable parameters were obtained by the least-squares method. The dependence of H-m(E) on mixture composition is qualitatively discussed in terms of molecular interactions.

Densities, ρ, viscosities, η, and refractive indices, nD, of binary mixtures containing n-hexane + α-pinene (2,6,6-trimethylbicyclo[3.1.1]hept-2-ene), + β-pinene (6,6-dimethyl-2-methylene bicyclo[3.1.1]heptane), + p-cymene (1-methyl-4-[1-methylethyl]benzene), + (S)-(−)-limonene [(−)-1-methyl-4-(1-methylethenyl)cyclohexene], + 1,8-cineole (1,3,3-trimethyl-2-oxabicyclo[2.2.2]octane), and + linalool (3,7-dimethyl-1,6-octadien-3-ol) were determined at 298.15 K and at atmospheric pressure using a digital density meter, a Schott viscosity measuring system, and an Abbe refractometer, respectively. The excess molar volumes, , deviations in viscosities, Δη, and deviations in molar refractions, ΔR, calculated from experimental measurements, are always negative, with the exception of the curve referring to the hexane + linalool mixture, which shows an inversion of sign. Results were fitted to the Redlich−Kister polynomial and qualitatively discussed in terms of molecular interactions. The McAllister multibody intera...

Densities, ρ, viscosities, η, refractive indices, nD, and excess molar enthalpies, , of binary mixtures containing methyl tert-butyl ether (MTBE) + α-pinene (2,6,6-trimethylbicyclo[3.1.1]hept-2-ene), + β-pinene (6,6-dimethyl-2-methylenebicyclo[3.1.1]heptane), + p-cymene [1-methyl-4-(1-methylethyl)benzene], + (S)-(−)-limonene [(−)-1-methyl-4-(1-methylethenyl)cyclohexene], + 1,8-cineole (1,3,3-trimethyl-2-oxabicyclo[2.2.2]octane), and + linalool (3,7-dimethyl-1,6-octadien-3-ol) were determined at 298.15 K and at atmospheric pressure using a digital density meter, a Schott measuring system, an Abbe refractometer, and a flow microcalorimeter, respectively. The excess molar volumes, , the deviations in viscosities, Δη, and in refractive indices, ΔR, and the excess molar enthalpies, , were calculated from experimental measurements. Results were fitted to the Redlich−Kister equation to obtain the adjustable parameters and standard deviations. Results were also qualitatively discussed in terms of molecular intera...

Densities, ρ, viscosities, η, and excess molar enthalpies, , of binary mixtures containing (S)-(−)-limonene [(−)-1-methyl-4-(1-methylethenyl)cyclohexene] + 1,8-cineole (1,3,3-trimethyl-2-oxabicyclo[2,2,2]octane), (S)-(−)-limonene + linalool (3,7-dimethyl-1,6-octadien-3-ol), and cineole + linalool were determined at (298.15 and 313.15) K and at atmospheric pressure using a digital density meter, a Schott measuring system, and a flow microcalorimeter, respectively. The excess molar volumes, , the viscosity deviations, Δη, and the 's were calculated from experimental measurements. Results were fitted to the Redlich−Kister polynomial to obtain the adjustable parameters and standard deviations. Results were also qualitatively explained in terms of molecular interactions.

Excess molar enthalpies, , and excess molar volumes, , of binary mixtures containing 1,3-dioxolane or 1,4-dioxane + α-pinene, + β-pinene, or + p-cymene were determined at (298.15 and 313.15) K and at atmospheric pressure over the entire composition range using a flow microcalorimeter and a digital density meter. and are always positive, and the temperature dependence is more marked for values. Results were fitted to the Redlich−Kister polynomials to obtain the binary adjustable parameters and the standard deviations

Excess molar enthalpies, , and excess molar volumes, , of binary mixtures containing dimethyl carbonate (DMC), or diethyl carbonate (DEC) + α-pinene, + β-pinene, or + p-cymene have been determined using a flow microcalorimeter and a digital density meter at atmospheric pressure and at (298.15 and 313.15) K. All and data are positive and show symmetrical curves versus composition. The influence of temperature is marked for volumetric measurements while almost negligible for enthalpic data. Results have been correlated using the Redlich−Kister polynomial to estimate the binary interaction parameters. The calculated quantities have been qualitatively discussed in terms of thermodynamic interactions between the mixing compounds.

Excess molar enthalpies, H m E , of binary mixtures containing phenetole (ethoxy benzene)+α-pinene, or β-pinene have been determined in the range (288.15–313.15) K, and at atmospheric pressure using a flow microcalorimeter. H m E curves are symmetrical with positive values over the entire concentration range and show higher values for the mixture containing α-pinene (the maximum value for H m E is 1072 J mol −1 ). Only a slight influence of temperature on excess molar enthalpies has been observed for both systems. Experimental results have been correlated using the Redlich–Kister polynomial and the adjustable parameters have been evaluated by least-squares analysis. Results have also been interpreted by an extended modified cell model of Prigogine.

Excess molar enthalpies, H m E , of binary mixtures containing propylene carbonate + six n -alkoxyethanols have been determined using an LKB flow microcalorimeter at 288.15, 298.15, and 313.15 K and at atmospheric pressure. The alkoxyethanols were 2-methoxyethanol, 2-ethoxyethanol, 2-butoxyethanol, 2-(2-methoxyethoxy)ethanol, 2-(2-ethoxyethoxy)ethanol, and 2-(2-butoxyethoxy)ethanol. From the experimental data, deviations in H m E have been determined and fitted to the Redlich–Kister polynomial to estimate the binary interactions parameters.

Excess molar enthalpies, , and excess molar volumes, , of binary mixtures containing dimethyl carbonate or diethyl carbonate + anisole or + phenetole have been determined at (298.15 and 313.15) K and at atmospheric pressure. Standard deviations have been calculated from correlation of data by the Redlich−Kister polynomial. The calculated quantities have been qualitatively discussed in terms of thermodynamic interactions between the mixing components. Only a slight influence of temperature on the excess properties has been observed.

Excess molar enthalpies and excess molar volumes of diethyl carbonate + some alkoxyethanol mixtures have been determined by an LKB flow microcalorimeter and an Anton Paar density meter as a function of mole fraction of diethyl carbonate at (298.15 and 313.15) K. The alkoxyethanols are 2-methoxyethanol, 2-ethoxyethanol, 2-buthoxyethanol, 2-(2-methoxyethoxy)ethanol, 2-(2-ethoxyethoxy)ethanol, and 2-(2-butoxyethoxy)ethanol, respectively.

Excess molar enthalpies HmE of binary mixtures containing diethyl carbonate + 1-butanol, + 2-butanol, + 2-methyl-1-propanol, and + 2-methyl-2-propanol have been determined using a flow microcalorimeter in the range (288.15−318.15) K and at atmospheric pressure. All mixtures are strongly endothermic, with maxima of HmE varying from 1900 (mixture containing 1-butanol) to 2550 (mixture containing 2-butanol) J·mol-1. The HmE curves are nearly symmetrical and show values increasing as the temperature increases. Data have been correlated using the Redlich−Kister equation, and experimental results have been qualitatively discussed.

Excess molar enthalpies, , and excess molar volumes, , of propylene carbonate + seven pentanol isomers, namely, 1-, 2-, and 3-pentanol, 2-methyl-1-butanol, 2-methyl-2-butanol, 3-methyl-1-butanol, and 3-methyl-2-butanol, have been determined at 298.15 K and at atmospheric pressure using a flow microcalorimeter and a digital densimeter. and values are always positive, with the exception of the volumetric data for the mixture propylene carbonate + 3-methyl-2-butanol, showing a sign inversion of . The Redlich−Kister equation, fitted to the experimental results, provides a satisfactory mathematical representation of and in all mixtures. Results have been qualitatively discussed.

Excess molar enthalpies, , and excess molar volumes, , of dimethyl carbonate + 1-butanol, + 2-butanol, + 2-methyl-1-butanol, and + 2-methyl-2-butanol have been determined at (288.15, 298.15, and 313.15) K and atmospheric pressure using a flow microcalorimeter and a digital density meter. Excess properties are positive over the entire experimental conditions, increasing as the temperature increases. Maxima values of vary from 2100 up to 2900 J·mol-1. Those of vary from 0.57 up to 0.83 cm3·mol-1. Experimental data have been correlated using Redlich−Kister polynomials, and parameters from least-squares analysis have been reported.

Excess molar enthalpies, H E m of binary mixtures containing acetic or propionic acid+eight ethyl alkanoates have been determined at 298.15 K using a flow microcalorimeter. H E m values have been found to be positive with the exception of the acetic acid+ethyl acetate mixtures where an inversion of sign from positive to negative values occurs at the mole fraction of acetic acid x 1 ≈0.62 J mol −1 . H E m values vary in the range from −30 to 440 J mol −1 . The experimental results have been correlated using the Redlich–Kister equation.

Excess molar enthalpies, H E m , have been measured using a flow microcalorimeter at 298.15 K and at atmospheric pressure for the eight mixtures containing 1,2-epoxybutane with ethyl acetate, ethyl propanoate, ethyl butyrate, ethyl pentanoate, ethyl hexanoate, ethyl heptanoate, ethyl octanoate and ethyl decanoate. Excess heats of mixing, H E m , are positive for all the mixtures and increase with the chain length of the alkanoate, with the exception of ethyl acetate whose H E m values were between those of ethyl pentanoate and ethyl hexanoate. Results have been correlated in terms of the Redlich–Kister equation and qualitatively discussed in terms of molecular interactions.

Excess molar enthalpies, , and excess molar volumes, , of 2-methoxy-2-methylpropane (MTBE) and four pairs of structural isomers of alkyl alkanoates (ethyl propanoate, propyl ethanoate, ethyl butanoate, butyl ethanoate, ethyl pentanoate, pentyl ethanoate, ethyl hexanoate, and hexyl ethanoate) have been determined at 298.15 K and at atmospheric pressure using a flow microcalorimeter and an Anton Paar density meter. and values decrease as the chain length of the alkanoates is increased, showing marked negative values for . In contrast the values are small for all mixtures and vary from ≈ 95 J·mol-1 (ethyl propanoate) up to ≈−70 J·mol-1 (ethyl hexanoate); they are positive only for mixtures with ethyl propanoate, propyl ethanoate, ethyl butanoate, and butyl ethanoate and negative for the other mixtures. Results have been correlated using the Redlich−Kister equation.

Excess molar enthalpies of binary mixtures containing diethyl carbonate + fourteen n -alkyl alkanoates (six acetates, four propanoates and four butyrates) have been determined at 298.15 K and at atmospheric pressure using an LKB flow microcalorimeter. The experimental data have been fitted to the Redlich-Kister equation to estimate the binary parameters. The results have been qualitatively discussed.

Determinations of heat capacities, Cp, and excess molar enthalpies, HEm, of the binary mixtures propylene carbonate + acetic or propionic acid were carried out at (285.15, 298.15 and 313.15) K using a Perkin-Elmer DSC differential scanning calorimeter and an LKB flow microcalorimeter. All experimental values are positive and increase with the increase of temperature. The data have been fitted to a simple cubic polynomial (for Cp) and the Redlich-Kister equation (for HEm) to estimate the adjustable parameters and standard deviations of these systems. Results have been discussed in terms of molecular interactions and have been interpretated by an extended cell model.

Excess molar enthalpies and excess molar volumes of dimethyl carbonate + seven alkyl acetates have been determined at 298.15 K and at atmospheric pressure using a flow microcalorimeter and a digital density meter. Values of excess enthalpies and excess volumes increase as the chain length of the acetate molecule is increased. In contrast, the mixtures containing dimethyl carbonate + vinyl acetate show the lowest values. The experimental results have been correlated using the Redlich−Kister equation and have been qualitatively discussed.

Vapor−liquid equilibria, VLE, excess molar enthalpies, , and excess molar volumes, , for dimethyl and diethyl carbonate + methyl tert-butyl ether have been determined at 298.15 K and at atmospheric pressure. VLE data were tested for thermodynamic consistency and were correlated by the Wilson, NRTL, and Redlich−Kister equations. The Redlich−Kister polynomial was used to correlate and values. Parameters and least-squares analysis of the results have been reported.

This paper reports experimentally determined excess molar enthalpies, HEm, excess heat capacities, CEp, densities, ρ, and excess molar volumes, VEm, of propylene carbonate +1,2-epoxybutane at (288.15, 298.15 and 313.15 K) and atmospheric pressure. The results of HEm and VEm are compared with those predicted by an extended cell model elaborated by [I. Prigogine, The Molecular Theory of Solutions, North- Holland, Amsterdam (1957)]. Experimental HEm values are positive and show only small changes with the increase of temperature, while VEm data are always negative and decrease with the increase of temperature. Also CEp values are negative for all mixtures. Results have been qualitatively interpreted in terms of molecular interactions.

Isothermal vapor−liquid equilibria (VLE), excess molar enthalpies, , and excess molar volumes, , have been measured for the binary mixtures dimethyl carbonate + methanol, + ethanol, or + propan-1-ol at 313.15 K and at atmospheric pressure. The three mixtures exhibit large deviations from ideality, showing an azeotrope at 0.14, 0.42, and 0.78 mole fraction of dimethyl carbonate, respectively. The VLE data were correlated by the Wilson equation and the appropriate parameters are reported. and values have been correlated using the Redlich−Kister equation by the method of least-squares.

The excess molar enthalpies, , and the excess molar volumes, , of diethyl carbonate + seven n-alkanols have been determined at 298.15 K and atmospheric pressure in order to investigate interactions between molecules. Mixtures show an endothermic effect which increases with the increase of the chain length of alkanols. The same positive pattern is observed for . The experimental results have been correlated using the Redlich−Kister equation and have been qualitatively discussed.

A previously reported ‘chemical’ model proposes that most strongly non-ideal binary mixtures can be described as consisting of both simple chemical species and their associates. FTIR spectroscopy indicates that the title mixture can be considered to consist mainly of CHCl 3 , C 4 H 8 O, CHCl 3 ·C 4 H 8 O, and (CHCl 3 ) 2 . Comparison between experimental excess enthalpies and those calculated using the model indicates that such a composition provides a viable description of the mixture.

Excess molar enthalpies, HEm, densities, ϱ, and excess molar volumes, VEm, of dimethyl carbonate or diethyl carbonate + 2,2,4-trimethylpentane have been determined at 288.15, 298.15 and 313.15 K and at atmospheric pressure, using an LKB flow microcalorimeter and an Anton Paar digital density meter. For all mixtures, the HEm and VEm values are positive and increase slowly as the temperature is increased. The experimental values have been correlated by the Redlich-Kister equation and the adjustable parameters have been evaluated by least-squares analysis. The results are discussed qualitatively in terms of molecular interactions and have been interpreted by an extended cell model.

Excess molar enthalpies and excess molar volumes of propionic acid + octane, + cyclohexane, + 1,3,5-trimethylbenzene, + oxane, and + 1,4-dioxane have been determined at 313.15 K and atmospheric pressure using an isothermal flow microcalorimeter and a digital vibrating density meter. Redlich−Kister polynomials were fitted to the experimental data, and smooth representations of the results are presented.

Vapor−liquid equilibria, (VLE), excess molar enthalpies, , and excess molar volumes, , of dimethyl carbonate + 1,2-epoxybutane have been determined at 288.15, 298.15, and 313.15 K. The VLE data, obtained by using an all-glass dynamic recirculating still, were tested for thermodynamic consistency and correlated by the Wilson equation. and values were determined by means of an LKB flow microcalorimeter and an Anton Paar vibrating tube density meter, respectively. All excess properties are positive, with a negligible temperature dependence (maxima values of or are 295 J·mol-1 and 0.17 cm3·mol-1). and values have been correlated by the Redlich−Kister equation, and smooth representations are presented.

The excess molar enthalpies and the excess molar volumes for binary mixtures of propylene carbonate with methanol, ethanol, 1- and 2-propanol, and 1- and 2-butanol have been determined as a function of composition at 298.15 K and atmospheric pressure, using an LKB flow microcalorimeter and an Anton Paar density meter. The excess enthalpies are positive for all mixtures, while excess volumes are negative for methanol and ethanol, positive for 1- and 2-butanol and show a change of sign, as a function of composition, for 1- and 2-propanol. Both excess properties increase in magnitude as the alkanol chain length increases. Results were correlated by means of the Redlich−Kister equation and a qualitative molecular interpretation is presented.

Isothermal vapor−liquid equilibria, VLE, excess molar enthalpies, , and excess molar volumes, , were determined for 1,2-epoxybutane +methanol, +ethanol, + 1-propanol, and +2-propanol at 298.15 K. The VLE results were correlated with the Wilson equation, and and were correlated with the Redlich−Kister equation. Nonideality of the vapor phase was accounted for in the analysis of VLE data. Azeotropes occurred in the system 1,2-epoxybutane + methanol and, to a lesser extent, for 1,2-epoxybutane + ethanol.

Densities and excess molar volumes, V{sub m}{sup E}, for binary mixtures containing propylene carbonate + 10 chlorohydrocarbons (dichloromethane, 1,2-dichloroethane, 1,3-dichloropropane, 1,4-dichlorobuthane, 1,6-dichlorohexane, 1,10-dichlorodecane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, trans-1,2-dichloroethene, and trichloroethene) have been measured at 298.15 K and at atmospheric pressure using an Anton Paar digital vibrating tube density meter. The results are fitted to the Redlich-Kister equation. The values of V{sub m}{sup E} for the mixtures containing dichloroalkanes show an increasing trend with the increase of the chain length and vary from a minimum of {minus}0.24 cm{sup 3}/mol for dichloromethane up to a maximum of +0.31 cm{sup 3}/mol for 1,10-dichlorodecane. The excess molar volumes for the other mixtures are negative over the entire range of composition. Results are qualitatively discussed in terms of molecular interactions.

Excess molar enthalpies, H m E , densities, ρ, and excess molar volumes, V m E , of the binary mixtures propylene carbonate + dimethyl carbonate, propylene carbonate + diethyl carbonate and dimethyl carbonate + diethyl carbonate have been determined at 298.15 and 313.15 K. The excess molar enthalpies are positive for all mixtures while the excess molar volumes are positive only for the dimethyl carbonate + diethyl carbonate system. The absolute values of V m E for the mixtures containing propylene carbonate increase with the increase of temperature while for dimethyl carbonate + diethyl carbonate a smaller variation with temperature is noted.

Isothermal vapor-liquid equilibria at 343.15 K for 2,2,4-trimethylpentane+1,2-dichloroethane,+1,1,1-trichloroethane,+1,1,2,2-tetrachloroethane,+trichloroethylene, and+tetrachloroethylene binary systems have been determined using a recirculating still. The data were correlated by means of the Redlich-Kister equation. The excess Gibbs energies, determined from the vapor-liquid equilibrium data, present positive trends for all systems, with the minimum varying from 150 to 600 J mol -1

Isothermal vapor-liquid equilibrium (VLE) data, excess molar volumes VmE, and excess molar enthalpies H m E have been determined for dimethyl carbonate+1,2-dichloroethane or +1,1,1-trichloroethane. V m E and H m E were measured at 298.15 and 313.15 K. VLE measurements were alsomade at 333.15 K. The excess Gibbs free energy for the two systems has been derived at the three temperatures

Densities and excess molar volumes for the six binary mixtures containing 2,2,4-trimethylpentane +1,2-dichloroethane, +1,1,1-trichloroethane, +1,1,2,2-tetrachloroethane, +1,2- trans -dichloroethylene, +trichloroethylene, or +tetrachloroethylene have been determined at 298.15 K and atmospheric pressure using an Anton Paar density meter. The experimental values have been correlated by the Redlich-Kister equation and the parameters have been evaluated by least-squares analysis. For all mixtures, the V E values, whose maximum ranges from −0.38 up to 0.65cm 3 mol −1 , decrease with increasing number of chlorine atoms in the molecule. This volume effect is discussed qualitatively in terms of the molecular interactions.

Excess molar volumes V E of binary mixtures containing isooctane + six methyl- n -alkyl ketones have been determined using a digital density meter at 298.15 K and atmospheric pressure. The experimental values were correlated by the Redlich-Kister equation. V E decreases with an increase in the chain length of the ketone, from the highly positive values of isooctane + 2-propanone ( V E ≈ 1.0cm 3 mol −1 ) up to the markedly negative values of isooctane + 2-undecanone ( V E ≈ −0.4cm 3 mol −1 ). The volume effect is discussed qualitatively in terms of the molecular interactions.

Isothermal vapor-liquid equilibria, excess molar enthalpies, and excess molar volumes at 298.15 K have been determined for 1,3-dioxolane or oxolane+isooctane mixtures. Also the excess Gibbs energies for the two systems have been calculated from the vapor-liquid equilibrium data

Excess molar enthalpies HE of the fifteen binary mixtures containing toluene, p-xylene or pseudocumene + five methyl-n-alkyl ketones at 298.15 K and atmospheric pressure are reported. The results confirm for p-xylene or pseudocumene + ketones the systematic behavior of HE with respect to the chain length of the ketone, whereas for the toluene + 2-undecanone mixture, an inversion in the tendency of HE has been noted (Patterson effect). The experimental data are examined by an extended cell model.

Excess molar enthalpies H E , and excess molar volumes V E , of mixturesof p -xyleae with the cyclic ethers oxolane, oxane, 1,3-dioxolane, and 1,4-dioxane have been determined by means of a flow microcalorimeter and a digital density meter at 298. 15″ K and afinospheric pressure. The experimental values are correlated by polynomiah equations. V E is positive over the entire range of mole fractions for p -xylene-1,4-dioxane, but is negative for the other mixtures. H E is positive for the mixtures involving the diethers-1,3-dioxolane and 1,4-dioxane, and negative for the monoethers. The heat effects are qualitatively discussed in terms of molecular interactions.

Excess molar enthalpies and excess molar volumes of the binary systems 1,2,4-trimethylbenzene+oxane+1,4-dioxane,+oxolane, or +1,3-dioxolane have been measured with an LKB microcalorimeter and an Anton Paar density meter, respectively. Results were correlated by polynomial equation of the type X E =x 1 x 2 Σ k≥0 a k (x 1 -x 2 ) k . The results are interpreted in terms of molecular interactions

Excess molar enthalpies H E of binary mixtures containing chlorobenzene + five ethers (oxolane, oxane, 1,4-dioxane, dimethoxymethane and 1,2-dimethoxyethane) were determined at atmospheric pressure and at 298.15 K by means of a flow microcalorimeter. Experimental H E values were correlated by the Redlich-Kister equation and the results are interpreted in terms of molecular interactions. The influence of the structural parameters on H E is assessed.

Excess molar enthalpies, HE, of binary mixtures containing 1,3-dioxolane plus toluene, p-xylene, 1,2,4-trimethylbenzene, ethylbenzene, 1,4-dimethylbenzene, 1,4-dimethylcyclohexane and ethylcyclohexane were determined by means of a flow microcalorimeter. Experimental HE values were correlated by the Redlich-Kister polynomial. The aromatic set of compounds shows calorimetric behaviour markedly different from that of corresponding aliphatic cyclic compounds.