Abstract
The dielectric dispersion ε′ and dielectric loss ε″ of binary mixture of 1,2–diaminopropane – 2-aminoethanol were measured by employing the Time Domain Reflectometry technique over a frequency range 10 MHz to 20 GHz at 15, 25, 35 and 45°C. To evaluate various dielectric parameters, the frequency dependents complex permittivity (ε* (ω) = ε′- jε″) data such as static permittivity (εs), relaxation time (τ) and permittivity at high frequency (ε∞) were fitted by the non-linear least-squares fit method to Debye expression. Temperature dependent εs, τ, Kirkwood correlation factor (g), free energy of activation (ΔG) and enthalpy of activation (ΔH) have been determined and discussed in terms of the effect of -NH2 and -CH3 side-group on molecular dynamics and intermolecular hydrogen bonds. It is appropriate to report the present work on the dielectric behavior of 1,2–diaminopropane and 2-aminoethanol liquid molecules, and also their conformations, because the dielectric behavior and molecular dynamics of the system under study can be explored more clearly only by comparing the dielectric data of the mixture system with the dielectric data of the individual molecules and their dynamics.