Ultrasonic speeds and volumetric properties of mixtures containing polyethers and 2-methoxyethanol at the temperature 298.15 K

doi:10.1006/jcht.1998.0449

The Journal of Chemical Thermodynamics

Volume 31, Issue 2, February 1999, Pages 273-287

https://doi.org/10.1006/jcht.1998.0449 Get rights and content

Abstract

The excess molar volume and ultrasonic speed of (polyethers + 2-methoxyethanol) have been measured at the temperature 298.15 K as a function of composition. The polyethers were ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, diethylene glycol diethyl ether, and diethylene glycol dibutyl ether. The ultrasonic speed values have been combined with those of the excess molar volumes converted to densities to give estimates of the productK_S,mof the molar volumes and isoentropic compressibility κ_S, and the excess quantityK_S,m^E. The excess volumes are negative over the entire range of composition for all mixtures with the exception of diethylene glycol dibutyl ether, which changes sign from positive to negative. TheK_S,m^Evalues are negative for all mixtures. Comparable measurements have been carried out on the values of these two properties in an effort to assess the effects of increasing the alkyl group size with a common polar head group, and of inserting oxyethylene groups with a common alkyl group. Also, the deviations of the speed of soundu^Dwere compared with the mixing function δucalculated in the paper. Graphs ofV_m^E, u^D, δu, andK_S,m^Eagainst composition are presented as a basis for a qualitative discussion of the results.

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Ultrasound speeds and molar isentropic compressions of (3-ethoxypropane-1- amine + water) mixtures from T = (283.15 to 303.15) K
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Alkoxyamines containing two hydrophilic groups with great affinity to water are multipurpose compounds with important applications, either on theoretical or practical grounds. The thermodynamic characterization of aqueous mixtures of these compounds is scant. Ultrasound speed measurements have been made in 53 mixtures of the aqueous ethoxypropane-1-amine binary system, across the entire composition range and temperatures between T = (283.15 and 303.15) K, at atmospheric pressure. By combining ultrasound speed and density data, values of the isentropic compressibility were derived. Excess molar isentropic compressions were estimated and analytically fitted to Redlich–Kister polynomial equations. Excess partial molar quantities were then calculated including their limiting values, which were obtained from the Redlich–Kister fitting coefficients. The temperature dependences of limiting partial molar isentropic compressions and isobaric expansions were also scrutinized. Compressibility changes associated with different patterns of aggregation and hydration over the whole composition range are identified.
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Excess molar volumes (V_m^E) at 298.15 K and atmospheric pressure for 2-methoxyethanol or 2-butoxyethanol + 2,5-dioxahexane, +2,5,8-trioxanonane, +3,6,9-trioxaundecane, +5,8,11-trioxapentadecane, or +2,5,8,11,14-pentaoxapentadecane, or for 2-ethoxyethanol + 2,5,8-trioxanonane, +3,6,9-trioxaundecane, or +5,8,11-pentaoxapentadecane have been obtained from densities measured with and Anton-Paar DMA 602 vibrating-tube densimeter.
They are usually small in absolute value. It is due to a compensation between positive and negative contributions to the excess molar volume. For example, free volume effects present in solutions with the pentaether are compensated by the positive contribution to V_m^E from the rupture of dipole–dipole interactions between ether molecules.

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^f1: To whom correspondence should be addressed (E-mail: [email protected]).

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Regular ArticleUltrasonic speeds and volumetric properties of mixtures containing polyethers and 2-methoxyethanol at the temperature 298.15 K

Abstract

Regular Article
Ultrasonic speeds and volumetric properties of mixtures containing polyethers and 2-methoxyethanol at the temperature 298.15 K