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/content/aip/journal/jcp/139/13/10.1063/1.4823797
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/content/aip/journal/jcp/139/13/10.1063/1.4823797
2013-10-04
2016-09-27

Abstract

The temperature dependence of polymer dynamics below the standard glass transition is of considerable interest. Glassy relaxation dictates the process of physical aging, and understanding these slow dynamics helps in assessing a possible divergence at a finite temperature. In a recent paper, Zhao and McKenna have measured the equilibrium dynamics of poly(vinyl acetate) in the range from − 15 K to + 30 K using Struiks protocol [J. Zhao and G. B. McKenna, J. Chem. Phys.136, 154901 (2012)]. In a figure that is meant to compare their results with dielectric relaxation data from Wagner and Richert [Polymer38, 255 (1997)], dielectric retardation data from that work is shown instead. The corrected figure shows a considerable difference in the two measurements below − 10 K, Arrhenius versus Vogel-Fulcher-Tammann behavior, and a possible source of the difference is discussed.

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