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Glassy dynamics in mono-, di-, and tri-propylene glycol: From the alpha- to the fast beta-relaxation

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      Abstract

      We present a thorough characterization of the glassy dynamics of three propylene glycols (mono-, di- and trimer) by broadband dielectric spectroscopy. By covering a frequency range of more than 15 decades, we have access to the entire variety of dynamic processes typical for glassy dynamics. These results add three more molecular glass formers to the sparse list of materials for which real broadband spectra, including the region of the fast beta-process, are available. Some first analyses of the various observed dynamic processes are provided.

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      The Excess Wing in the Dielectric Loss of Glass-Formers: A Johari-Goldstein beta-Relaxation?

      Dielectric loss spectra of glass-forming propylene carbonate and glycerol at temperatures above and below T_g are presented. By performing aging experiments lasting up to five weeks, equilibrium spectra below T_g have been obtained. During aging, the excess wing, showing up as a second power law at high frequencies, develops into a shoulder. The results strongly suggest that the excess wing, observed in a variety of glass formers, is the high-frequency flank of a beta-relaxation.
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        Anomalies in the scaling of the dielectric α-relaxation

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          Merging of the α and β relaxations in polybutadiene: A neutron spin echo and dielectric study

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            Author and article information

            Journal
            29 October 2008
            0810.5316
            10.1016/j.jnoncrysol.2009.07.029

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

            Custom metadata
            J. Non-Cryst. Solids 356, 529 (2010)
            cond-mat.soft cond-mat.dis-nn

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