We investigated the microscopic origin of the excess wing through isothermal and isobaric dielectric relaxation measurements for the Quinaldine/tristyrene mixture. Our results show that the excess wing, characteristic of the high frequency side of the structural loss peak in neat Quinaldine, becomes a well resolved Johari-Goldstein secondary relaxation on mixing with the apolar tristyrene. Analyzing the temperature and pressure behavior of the two processes, a clear correlation has been found between the structural relaxation time, the Johari-Goldstein relaxation time and the dispersion of the structural relaxation (i.e. its Kohlrausch parameter). These results support the idea that the Johari-Goldstein relaxation acts as a precursor of the structural relaxation and therefore of the glass transition phenomenon. (c) 2007 Elsevier B.V. All rights reserved.
|Autori:||Kessairi, Khadra; Capaccioli, Simone; Prevosto, Daniele; Sharifi, Soheil; Rolla, Pierangelo|
|Titolo:||Effect of temperature and pressure on the structural (alpha-) and the true Johari-Goldstein (beta-) relaxation in binary mixtures|
|Anno del prodotto:||2007|
|Digital Object Identifier (DOI):||10.1016/j.jnoncrysol.2007.01.095|
|Appare nelle tipologie:||1.1 Articolo in rivista|