On the universal scaling of the dielectric relaxation in dense media

We reconsider the idea of the universal scaling of the alpha relaxation and point out what is the cause of the recent controversy concerning this concept. A necessary condition the scaling relationship has to follow is presented. Consequently, we suggest that a generalized scaling relationship, which is potentially able to account for the dielectric relaxation of low-molecular-weight as well as polymeric glass-formers, is likely to be established. The generalized scaling plot for the literature experimental data of several glass-forming systems (low molecular weight and polymeric) is presented.