Changes of the Primary and Secondary Relaxation of Sorbitol in Mixtures with Glycerol

The dielectric relaxation experimental data on the α - and Johari−Goldstein β -relaxation dynamics of sorbitol in the neat state and in mixtures with glycerol published by Duvvuri and Richert ( J. Phy s. Che m. B, published online Apr 23, http://dx.doi.org/10.1021/jp031366b ) is challenging to explain. Not only does one need a theory or model that can address both the α - and Johari−Goldstein β -relaxation dynamics in a neat glass-former, but one also a theory or model that can address them in a mixture. The coupling model fulfills these requirements. Naturally, we employ the coupling model to interpret the experimental data. Fair agreements are found between the predictions of the model and data of neat sorbitol and mixtures of sorbitol with glycerol.