Abstract
Dynamics of the primary and the Johari‐Goldstein (JG) secondary relaxations for polar molecules as a component in mixtures and also neat glass‐forming systems have been investigated by means of broadband dielectric measurements at ambient pressure and elevated pressures P and various temperatures T. The ratio of their relaxation times was found invariant to different combinations of P and T keeping the primary relaxation time constant. In addition, isochronal spectra, obtained with different T‐P combinations, superimposed. Several other properties of the JG relaxation were also found to be related to or correlated with the primary relaxation. Our results indicate the fundamental role played by the JG relaxation in glass transition.
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