Dynamic Correlation Under Isochronal Conditions

  • C. M. RolandEmail author
  • D. Fragiadakis
Part of the Advances in Dielectrics book series (ADVDIELECT)


Results of various methods of evaluating the dynamic correlation volume in glassforming liquids and polymers are summarized. Most studies indicate that this correlation volume depends only on the α-relaxation time; that is, at state points associated with the same value of τ α , the extent of the correlation among local motions is equivalent. Nonlinear dielectric spectroscopy was used to measure the third-order susceptibility. Its amplitude, a measure of the dynamic correlation volume, is constant for isochronal state points, which supports the interpretation of the magnitude of the nonlinear susceptibility in terms of dynamic correlation. More broadly, it serves to establish that for non-associated materials, the cooperativity of molecular motions is connected to their timescale.



This work was supported by the Office of Naval Research.


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Authors and Affiliations

  1. 1.Naval Research Laboratory, Chemistry DivisionWashingtonUSA

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