Liquid 2-oxazolidones. I. Dielectric constants, viscosities, and other physical properties of several liquid 2-oxazolidones

Dielectric constants, viscosities, and related physical properties of several substituted liquid ureas at various temperatures

“…The density data as a function of temperature were fitted precisely to Equation 2 (18): p = a + bt The average and maximum deviations between experimental and calculated densities does not exceed 0.02% (Table III). DMPU has a consistently higher density (Table I) than DMEU, and both are greater than water up to 75 °C.…”

“…The dielectric constant data were analyzed by fitting them to the linear empirical Equation 1 (10,18):…”

“…A Model 4666 Leeds and Northrup Dyke-Jones conductivity bridge unit, described in detail elsewhere (11), in conjunction with a Freas-type conductance cell (12) was used to measure the specific conductivities of TEU, DMEU, and DMPU. Capacitance measurements were obtained at 1 MHz using a Twin-T impedence bridge assembly, described in detail elsewhere (6), in conjunction with two glass cells having parallel plate electrodes of different geometries (6,18). Cells of this type with platinum electrodes have been used by other investigators, and their results indicate the suitability of these cells for such measurements (7, 18, 21).…”

Several properties of the dimethyl sulfoxide-3-methyl-2-oxazolidone system as functions of composition and temperature

“…Me2SO was obtained commercially (Mallinckrodt Analytical Reagent). 3Me20x was available from a laboratory supply which had been prepared as described previously (6). Me2SO and 3Me20x were purified similarly through a sequence of fractional freezings under nitrogen (4) until a product with a constant, maximum freezing point was obtained, i.e., 18.5 and 15.9 °C for Me2SO and 3Me20x, respectively.…”

“…The utility of dimethyl sulfoxide (Me2SO) as an outstanding solvent for both electrolytes and nonelectrolytes has become well established and known during the last 2 decades. Studies in this laboratory within the last few years (1,5,6) have indicated that 3-methyl-2-oxazolidone (3Me20x), which has a dielectric constant essentially equal to that of water, similarly appears to have great potential as an electrolytic solvent. Me2SO and 3Me20x have dielectric constants of 46.45 and 77.54 and viscosities of 1.991 and 2.450 cP, respectively, at 25 °C.…”