Dielectric properties of pure liquid N-methyl acetamide

Abstract

The dielectric absorption of pure liquid N-methyl acetamide has been studied. The permittivities and dielectric losses have been measured over the frequency range 450–2000 MHz and for the temperature range 31.0–50.0°C. A single relaxation time was observed at all temperatures studied and the values obtained were in the range (310–619)× 10^–12 s, which are greater than expected for such molecules. A linear Arrhenius plot of the relaxation times gives an activation energy of 31.5 kJ mol^–1.

The apparent dipole moment associated with this absorption was also calculated using the Onsager equation and values of 5.83–618 D were obtained.