Viscoelastic relaxation in the acetamide + sodium thiocyanate binary system

Abstract

The shear impedance, density and viscosity of the eutectic mixture NaCNS + CH₃CONH₂ have been measured in the temperature range 253–313 K and at the frequencies 31 and 87 MHz. The real parts of the complex impedance and of the rigidity modulus have been obtained. The relaxation region is shifted in comparison with that of the Maxwell model and is interpreted using the modified B.E.L. model. Irregularities in the real part of the mechanical impedance (around 283 K) and in the Arrhenius plot of the viscosity (around 293 K) may be attributed to changes in the liquid structure.