Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 351, Issue 33-36, Pages 2635-2642Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnoncrysol.2005.03.060
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Experimental evidence is presented to show that temperature, volume and/or entropy enter earlier into the Johari-Goldstein (JG) relaxation to assert their influence on the mobility of molecules, long before the primary alpha-relaxation becomes known. Since the JG relaxation is the precursor of alpha-relaxation, a theory of glass transition needs reconsideration if it considers only the alpha-relaxation and it regards the alpha-relaxation as where originate the dependences of molecular mobility on temperature, volume and/or entropy. Actually, many-molecule dynamics transform the precursory JG relaxation to the terminal alpha-relaxation progressively with time. The stronger dependences of the alpha-relaxation time T. on temperature, volume and/or entropy are derived from the weaker dependences of the JG relaxation time tau(JG). A schematic solution of the glass transition problem based on the coupling model and the JG relaxation is proposed.
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