Vapor–Liquid Equilibria, Density, Speed of Sound, and Viscosity for the Poly(ethylene glycol) 400 + 1-Propanol and 1-Butanol Systems

Abstract

By using the improved isopiestic method, solvent activity measurements have been performed on the systems poly(ethylene glycol) 400 (PEG 400) + 1-propanol and 1-butanol at 298.15 K. Calcium chloride was used as the isopiestic standard for the calculation of activities. The obtained solvent activity data were correlated with the original Flory−Huggins model. The strength of interaction between different alcohols and the polymer was discussed on the basis of the obtained Flory−Huggins interaction parameters. Measurement of the density, speed of sound, and viscosity data were also performed at T = (288.15 to 328.15) K for the PEG 400 + 1-propanol and 1-butanol systems. The excess molar volume, V E , isentropic compression deviation, ΔK s , and viscosity deviation, Δη, have been calculated for each composition from the experimental data and fitted to the Redlich−Kister equation.

Vapor–Liquid Equilibrium, Volumetric, and Compressibility Properties of 1-Propanol + Poly(ethylene glycol) Dimethyl Ether 250 and 500 Binary Mixtures

“…V s 0 and p s 0 are the molar volume and vapor pressure of 1-propanol and p exp represent the vapor pressure of solution. The constants of B, V s 0 , and p s 0 for 1-propanol at 298.15 K are given in Table 6, and are as follows: 34 p s 0 (kPa) = 2.78. 34 Vapor pressure depression values (Δp) are another important thermodynamic property which is directly attributed to the solute−solvent interactions and can be computed using the vapor pressures of the solutions, with use of eq 12. where p exp is the experimental vapor pressure and p s 0 is the vapor pressure for the pure solvent.…”

“…V s 0 and p s 0 are the molar volume and vapor pressure of 1-propanol and p exp represent the vapor pressure of solution. The constants of B , V s 0 , and p s 0 for 1-propanol at 298.15 K are given in Table , and are as follows: 10 3 · B (m 3 ·mol –1 ) = −2.9134, 10 5 · V s * (m 3 ·mol –1 ) = 7.5117, p s 0 (kPa) = 2.78 …”

Measurement and Correlation of Activity, Density, and Speed of Sound for Binary Mixtures of 1-Propanol + Poly(Propylene Glycol) 400, 725, and 1025

“…Equation coefficients for 1-propanol + CaCl 2 derived from the literature 5 The activity data for 1-propanol + CaCl 2 has obtained with standard deviation of about 0.001, and based on, the activity values are reported with three decimal point for polymer + alcohol solution. The obtained activities are given in Table 2 and shown in Figure 1.…”

“…These data have valuable results to understand the interactions between the components of the mixtures in polymer−solvent systems and deviation from ideal solutions. 5 Different research groups measured the thermodynamic properties of polymers mixtures in several organic solvents. 6,7 Despite the importance and extensive application of the PPG in industry there are limited thermodynamic data for this polymer in organic solvents.…”

“…The design, optimization, and development of process, including polymers mixtures, thermodynamic properties, such as vapor–liquid equilibrium (VLE) and volumetric properties, are needed. These data have valuable results to understand the interactions between the components of the mixtures in polymer–solvent systems and deviation from ideal solutions …”