Excess Molar Enthalpies of Binary Mixtures Containing Glycols or Polyglycols + Dimethyl Sulfoxide at 308.15 K

Abstract

Excess molar enthalpies,, were determined as a function of molar fraction at 308.15 K and at atmospheric pressure for the binary mixtures containing dimethyl sulfoxide with ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, poly(ethylene glycol)-200, poly(ethylene glycol)-300, poly(ethylene glycol)-400, and poly(ethylene glycol)-600. All curves are negative over the entire composition range with minima ranging from −430 J·mol -1 (propylene glycol) up to −1080 J·mol -1 (poly(ethylene glycol)-600). The results were correlated using the Redlich−Kister polynomial, and the adjustable parameters were obtained by the least-squares method. The dependence of on mixture composition is qualitatively discussed in terms of molecular interactions.