Microwave Dielectric Relaxation in Binary Mixtures of 1,3-Diaminopropane in Dimethylaminoethanol

Abstract

The dielectric dispersion ε′ and dielectric loss ε″ of binary mixture of 1,3-diaminopropane-N,N-dimethylaminoethanol were measured by employing the time domain reflectometry technique over a frequency range 10 MHz to 20 GHz at 288 K, 298 K, 308 K, and 318 K. To evaluate various dielectric parameters, the frequency dependents complex permittivity (ε* (ω) = ε′ – jε″) data viz., dielectric constant (ε0), relaxation time (τ), and permittivity at high frequency (ε∞) were fitted by the nonlinear least-squares fit method to Debye expression. Temperature dependent ε0, τ, Kirkwood correlation factor (geff), and free energy of activation (ΔG) have been determined and discussed in terms of the effect of -NH2 and -CH3 side-group on molecular dynamics and intermolecular hydrogen bonds.