DENSITIES, REFRACTIVE-INDEXES, SPEEDS OF SOUND AND SHEAR VISCOSITIES OF DIETHYLENE GLYCOL DIMETHYL ETHER-METHYL SALICYLATE AT TEMPERATURES FROM 298.15 TO 318.15-K

Densities, refractive indices, speeds of sound and viscosities of the diethylene glycol dimethyl ether-methyl Salicylate system were measure d as a function of mole fraction at 298.15, 303.15, 308.15, 313.15 and 318.15 K. The results are fitted by a power series equation involving both the temperature and mole fraction variables. The basic physical data of the mixtures are further used to calculate the excess molar vo lume V(E), changes in isentropic compressibility DELTAbeta, changes in refractivity DELTAR and changes in viscosity DELTAeta. The results ar e fitted by the Redlich-Kister polynomial relation. The isobaric therm al expansion coefficients of the mixtures are also determined from den sity measurements. The data are compared with those obtained from equa tions derived by differentiation of the Lorentz-Lorenz and Eykman rela tions. Refractive indices of the mixture are used to test the validity of mixing relations. The changes in isobaric thermal expansion coeffi cients DELTAalpha of the mixtures were examined. Viscosity data were t ested in terms of the McAllister, Heric and Auslaender relations.