Measurement and correlation of densities and viscosities of thiourea in triglycol solution using VTF equation

Chen, X.; Li, H.; Guo, Feng

doi:10.1134/s0036024410130108

Cited by 3 publications

(5 citation statements)

References 3 publications

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“…108,109 (squares), Valtz et al134 (circles), Klimaszewski et al136 (triangles), Almasi137 (inverted triangles), Mesquita et al113 (diamonds), Chen et al138 (left-pointing triangles), Afzal et al60 (rightpointing triangles), and Pereira et al62 (stars) to the results of this study.…”

supporting

confidence: 67%

“…Specifically, for diethylene glycol in Figure , the data set of Li et al deviates by more than −10%, the data set by Kumagai et al up to −22%, and the data set by Wang et al deviates by about −40%. For triethylene glycol in Figure , the data set by Chen et al stands out with %RDs increasing with temperature from about −20 to about −45. The data sets by Sagdeev et al , for diethylene glycol in Figure and Hao et al and Qiao et al for triethylene glycol in Figure appear to include one erroneous outlying data point.…”

Section: Resultsmentioning

confidence: 92%

“…In this regard, it would be helpful if one could predict the physicochemical properties of polydisperse PEGs based on the analysis of their exact composition. It should be noted that even the low average molar mass PEG 200 covers oligomers from mono- to nonaethylene glycol with tetra- and pentaethylene glycol being the most prominent components. , A perusal of the literature reveals that there are numerous reports on density and viscosity for the neat lowest oligomers diethylene glycol, ,,− ,− trietheylene glycol, ,− ,,,,− ,− ,− ,− and tetraethylene glycol, ,,…”

Section: Introductionmentioning

confidence: 99%

“…Figure 3. % Relative deviation (%RD) of triethylene glycol density of results from (a) Carvalho et al100 (squares), Carvalho et al100 (circles), Crespo et al101 (triangles), Hao et al127 (inverted triangles), Qiao et al128 (diamonds), Begum et al129 (left-pointing triangles), Guo et al132 (right-pointing triangles), and Aniya et al133 (stars) and (b) Sagdeev et al108,109 (squares), Valtz et al134 (circles), Klimaszewski et al136 (triangles), Almasi137 (inverted triangles), Mesquita et al113 (diamonds), Chen et al138 (left-pointing triangles), Afzal et al60 (rightpointing triangles), and Pereira et al62 (stars) to the results of this study.…”

mentioning

confidence: 99%

“…Figure6. % Relative deviation (%RD) of triethylene glycol viscosity results from Carvalho et al100 (squares), Hao et al127 (circles), Qiao et al128 (triangles), Begum et al98 (inverted triangles), Guo et al132 (diamonds), Ghaedi et al23 (left-pointing triangles), Almasi137 (rightpointing triangles), Mesquita et al113 (hexagons), Chen et al138 (stars), and Pereira et al62 (plus sign) to the results of this study.…”

mentioning

confidence: 99%

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Densities, Viscosities, and Self-Diffusion Coefficients of Ethylene Glycol Oligomers

Hoffmann

Horowitz

Gutmann³

et al. 2021

J. Chem. Eng. Data

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Polyethylene glycol (PEG) is gaining interest as an alternative green solvent in chemical synthesis and processing. This report presents density and viscosity data from 293.15 K to 358.15 K as well as self-diffusion coefficient data from 298.15 K to 358.15 K for oligomers of PEG from di-to nonaethylene glycol. The results were obtained by extrapolation from measurement series where water, the most common impurity in PEGs, was intentionally added in several increments. The obtained results are carefully compared to literature data, which are widely available only for density and viscosity, and only for the lower oligomers. Densities are found to be linearly dependent on temperatures for all studied oligomers. The temperature dependence of viscosity and self-diffusion coefficients show only slight deviations from the Arrhenius equation over the investigated temperature range. The activation energies obtained from the viscosity data agree well with the activation energies from the self-diffusion coefficient data and appear to be linearly dependent with respect to the number of ethylene oxide repeat units in the PEG oligomer. This linearity combined with the observation that the pre-exponential factor appears to be the same for all studied oligomers may serve as a tool to estimate viscosities and self-diffusion coefficients for higher oligomers within the investigated temperature range. The densities of the oligomers all fall within a rather narrow range without a clear trend in homologous series.

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