Dielectric constant (epsilon) and refractive indexes (n) were measured for pure N,N-dimethylformamide, ethane-1,2-diol, and their six mixtures over the entire composition range and, where possible, at nineteen selected temperatures ranging between -10 and +80-degrees-C. The above properties were fitted by empirical equations stating their dependence on temperature (T) and mole fraction (x1) of the mixture. The refractive indexes of the binary mixtures were used to test the validity of mixing rules at different temperatures.
The N,N-dimethylformamide + ethane-1,2-diol solvent system. Dielectric constant, refractive index, and related properties at various temperatures / Marchetti, Andrea; Preti, Carlo; M., Tagliazucchi; Tassi, Lorenzo; Tosi, Giuseppe. - In: JOURNAL OF CHEMICAL AND ENGINEERING DATA. - ISSN 0021-9568. - ELETTRONICO. - 36:(1991), pp. 365-368.