Comparative measurements of the electrical and shear mechanical response functions in some supercooled liquids

Abstract

The frequency dependences of the shear modulus, G s( ω), (10 Hz–60 kHz) and dielectric constant, ϵ(ω), (10 Hz–10 MHz) have been measured at various temperatures. Two different liquids have been studied: the polyalcohol 1,3-Butandiol which has a large dielectric relaxation strength and a silicone oil with a very small relaxation strength. It is shown that the normalized relaxational part of the inverse dielectric susceptibility and the mechanical shear modulus are identical for both liquids, while the loss peak frequencies are different.