Dielectric constants and viscosities of some mono-N-substituted amides and cyclic esters

Abstract

Dielectric constants, densities, and viscosities of four mono-N-substituted amides of acetic and formic acids and two sulfur-containing cyclic esters have been determined at several temperatures in the 25°to 75°C. range. Computer methods have been used to obtain least squares fitting of the experimental data to appropriate equations. Five of the six liquids have dielectric constants which are greater than that of water at a comparable temperature. The dielectric constants of the liquids are discussed with respect to structure and compared with those of closely related species. Activation energies of viscous flow have been calculated using a differentiated form of the Girifalco equation.

Conductance-Viscosity Studies on Some Moderately Concentrated Nonaqueous Electrolyte Solutions from −50° to 125°C

“…The equipment and procedures which were used in the determination of viscosities and densities have been discussed thoroughly in previous articles (8,9). Densities were necessary for calculating absolute vis- cosities and converting concentrations from a weight to a volume basis.…”

Correlation of Dielectric Properties with Structure and H-Bonding for Liquids

“…All measurements were performed at 298 K, unless otherwise stated. ε s and ε ∞ literature values for F, ,,– NMF ,,,,,,,– , and NEF. – …”