ROLE OF THE 2ND-ORDER MEMORY FUNCTION ON THE DIELECTRIC-RELAXATION

In this paper the use of the second-order memory function to represent experimental results of dielectric relaxation data of amorphous and g lass forming materials is presented, and particularly, its interpretat ion in terms of the frequency dependence of the complex, shear modulus , shear viscosity, and diffusion coefficient is pointed out. The metho d used for its evaluation is applied to consider the experimental resu lts for three ester substances, and their particular features are disc ussed. (C) 1998 American Institute of Physics. [S0021-9606(98)50843-4] .