Vapor–Liquid Equilibria, Density, Speed of Sound, and Viscosity for the System Poly(ethylene glycol) 400 + Ethanol at Different Temperatures

Abstract

Solvent activity measurements have been performed on the system poly(ethylene glycol) 400 (PEG400) + ethanol at T ) (298.15 to 328.15) K using an improved isopiestic method. The solvent activity data were correlated with the original and modified Flory-Huggins models. The density, speed of sound, and viscosity data were also measured at T ) (288.15 to 328.15) K for the PEG400 + ethanol system. From these experimental data, the excess molar volume, V E , excess molar isentropic compression, K E s,m , and viscosity deviation, ∆η, have been determined for each composition and fitted to the Redlich-Kister equation.

Stability and rheological properties of nanofluids containing ZnO nanoparticles, poly(propylene glycol) and poly(vinyl pyrrolidone)

“…Reliability of viscosity values measured in this work has been examined with comparison between measured PEG400 viscosity values and that reported in literature and also measured by us in our previous work with capillary viscometer [40]. The value of 85 (mPa.s) was obtained at 298.15 K in zero shear rate for PEG400 using rheometer; the values of 84.71 and 85.05 reported respectively in literature [24] and obtained by us in our previous work [40]. This indicates the accuracy of rheological properties measured by this rheometer.…”

“…Several industrial applications make use of polymers such as PEG, poly (propylene glycol) (PPG), and their copolymers. PPG is less toxic than PEG and frequently used in the pharmaceutical and cosmetic fields as solvent, carrier, humectants, lubricant, binder, base and coupling agent and also for extraction, separation, and purification of biological materials [24]. Poly (vinyl pyrrolidone) (PVP) plays the role of surfactants in the solutions.…”

Concentration dependence of the Flory-Huggins interaction parameter in aqueous solutions of capped PEO chains

“…(1.2). In further contrast, with ethanol as solvent 16 the observed concentration dependence is distinctly modest. …”

Effect of temperature on volumetric and transport properties of nanofluids containing ZnO nanoparticles poly(ethylene glycol) and water

“…Details of the experimental setup and measuring procedure [12] 1526.61 [12] 33.81 [12] 2.00 have been given elsewhere [28]. The temperature was automatically kept constant within uncertainty ±0.001 K. In each measurement, the uncertainty of density and speed of sound were ±5.0 Á 10 À6 g Á cm À3 and ±0.5 m Á s À1 , respectively.…”

“…Because of their low toxicity, PEGs are frequently used in the pharmaceutical and cosmetic fields as solvents, carriers, humectants, lubricants, binders, bases and coupling agents and also for extraction, separation, and purification of biological materials [12]. The influence of PEG on rheological properties and stability of nanocrystalline titania hydrosols, and thermal conductivity of PEG nanofluids containing carbon coated metal nanoparticles have been studied previously [13,14].…”