Molecular Interactions in Poly(ethylene glycol)–Water Mixtures at Various Temperatures: Density and Isentropic Compressibility Study

Abstract

The densities and sound velocities of mixtures of water with poly(ethylene glycol), poly(ethylene glycol) monomethylether, and poly(ethylene glycol) dimethylether with mean molar weights between 250 and 500 have been measured as a function of mixture composition and temperature between 10 and 40 degrees C. Isentropic compressibilities are derived from the data and are compared to those for the ethylene glycol/water system and for other organic solvent/water mixtures. Relative minima in the mixture volume to ideal volume ratio and in the dependence of the compressibility upon mixture composition are discussed in terms of the conformational variability of the chainlike oligomers, of hydrogen-bonded networks, and of water clusters between the oligomer chains.

Interactions of polyethylene glycols with water studied by measurements of density and sound velocity

“…The apparent molar expansibility and compressibility of water were calculated and the results were interpreted in terms of hydration behavior of polymer chain. Recently Hanke et al [26] reported a work on molecular interactions of PEG-water mixtures at various temperatures examined by density and sound velocity measurements. Besides PEGs 200, 400, and 600, the derivatives of PEG with methylated end groups were also studied and the results were discussed in terms of conformational variability of the chainlike oligomers, of H-bonded networks and of water clusters between the oligomer chains.…”

Correlation between ultrasonic velocity, surface tension, density and viscosity of ionic liquids

“…We also used successfully ultrasonic velocity and density data to explain attractive and repulsive interactions in polymeric solutions [28]. As ultrasonic velocity is an important physicochemical property and when used with density, gives bulk modulus [29] which is important mechanical property for device development. …”

Ultrasonic investigation of magnetic nanoparticles suspension with PEG biocompatible coating

“…8 shows the adiabatic compressibility of nanoparticles. The adiabatic compressibility of nanoparticles (magnetite/oleate/PEG system) has a value similar to the PEG compressibility (b s E3.5 Â 10 À 10 m 2 N À 1 [28]) than the magnetite (b s E6 Â 10 À 12 m 2 N À 1 [29]). Layers of surfactant determine elastic properties of nanoparticles.…”