Effect of Temperature and Composition on the Surface Tension and Thermodynamic Properties of Binary Mixtures of Boltorn U3000 with Alcohols and Ether

The surface tension of the pure hyperbranched polymer, Boltorn U3000, and binary mixtures of Boltorn U3000 with alcohols (1-butanol, 1-hexanol) have been measured at atmospheric pressure in the range of temperatures from 298.15 K to 328.15 K, or of Boltorn U3000 with methyl-tert-butylether (MTBE) in the range of temperatures from 298.15 K to 318.15 K. These measurements have been provided to complete information of the influence of temperature on surface tension for the selected polymer, which was chosen as a possible new entrainer in extraction processes. The surface thermodynamic functions such as surface entropy and enthalpy have been derived from the temperature dependence of the surface tension, as well as the critical temperature, parachor and speed of sound for the pure polymer. The influences investigated here include the effects of the alkyl chain length of an alcohol and solvent polarity on the surface tension. [GRAPHICS] The use of hyperbranched polymers in separation processes involving extractive distillation, solvent extraction, absorption, membranes or preparative chromatography might have considerable potential for future technologies.