Densities, Viscosities, and Refractive Indices of New Mixtures of Poly(ethylene glycols) - Dialkyl Carbonates at 313.15 K

• Autores: Stefano Ottani, Daniele Vitalini, Fabio Comelli, Carlo Castellari
• Localización: Journal of chemical and engineering data, ISSN 0021-9568, Vol. 49, Nº. 1, 2004, págs. 148-154
• Idioma: inglés
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• Resumen

  • Densities, viscosities, and refractive indices for binary systems containing mixtures of poly(ethylene glycols) at the same number-average molecular mass (Mn ≈ 300) but different polydispersities (molecular mass distribution between 1.15 and 1.98) with dimethyl carbonate or diethyl carbonate were determined at 313.15 K and at atmospheric pressure. The measurements were carried out over the whole range of composition, using a vibrating-tube density meter, Ubbelohde viscometers with a Schott-Geräte AVS 310 unit, and an Abbe refractometer. Densities, viscosities, and refractive indices were used to compute the excess volumes, VE, viscosity deviations, Δη, and deviations in molar refraction, ΔR. Results were fitted to the Redlich−Kister polynomial, and the adjustable parameters were obtained using least-squares methods. The viscosity dependence on temperature was investigated between (309.15 and 327.15) K for some solutions in a restricted composition range. A qualitative discussion on these quantities in terms of molecular interactions is reported.