versión On-line ISSN 0718-0764
PAEZ, Manuel S; LAFONT, Jennifer y PORTACIO, Alfonso A. Effect of the Temperature on the Viscosity of Diluted Aqueous Solutions of 1,2-Pentanediol. Inf. tecnol. [online]. 2009, vol.20, n.2, pp.55-60. ISSN 0718-0764. http://dx.doi.org/10.4067/S0718-07642009000200008.
Viscosity of diluted aqueous solutions of 1,2-pentanediol was determined at several temperatures between 283 and 308 K, using an Ubbelohde viscometer. The B coefficients for viscosity, the variation dB/dT, the enthalpy, the entropy and the free Gibbs activation energy were evaluated. It was found that the B coefficient decreases as the temperature increases. The values obtained for dB/dT are both low and negative for all the temperature measures, which indicate that the 1,2-pentanediol has a structure forming effect on water and the presence of specific interactions caused by hydrogen bonds between diol and water.
Palabras clave : viscosity; aqueous solutions; temperature effects; 1,2-pentanediol.