Densities, Viscosities, and Refractive Indices of New Mixtures of Poly(ethylene glycols) + Dialkyl Carbonates at 313.15 K
| Autor: | Ottani S., Vitalini D., Comelli F., Castellari C. |
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| Rok vydání: | 2004 |
| Zdroj: | Journal of chemical and engineering data 49 (2004): 148. info:cnr-pdr/source/autori:Ottani S., Vitalini D., Comelli F., Castellari C./titolo:Densities, Viscosities, and Refractive Indices of New Mixtures of Poly(ethylene glycols) + Dialkyl Carbonates at 313.15 K/doi:/rivista:Journal of chemical and engineering data/anno:2004/pagina_da:148/pagina_a:/intervallo_pagine:148/volume:49 |
| Popis: | Densities, viscosities, and refractive indexes for binary systems contg. mixts. of poly(ethylene glycols) at the same no.-av. mol. mass (Mn » 300) but different polydispersities (mol. mass distribution between 1.15 and 1.98) with di-Me carbonate or di-Et carbonate were detd. at 313.15 K and at atm. pressure. The measurements were carried out over the whole range of compn., using a vibrating-tube d. meter, Ubbelohde viscometers with a Schott-Geraete AVS 310 unit, and an Abbe refractometer. Densities, viscosities, and refractive indexes were used to compute the excess vols., VE, viscosity deviations, ? ?, and deviations in molar refraction, ?R. Results were fitted to the Redlich-Kister polynomial, and the adjustable parameters were obtained using least-squares methods. The viscosity dependence on temp. was investigated between (309.15 and 327.15) K for some solns. in a restricted compn. range. A qual. discussion on these quantities in terms of mol. interactions is reported. |
| Databáze: | OpenAIRE |
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