Abstract.
The previtreous dynamics in the glass-forming monomer, glycerol monoacrylate (GMA), was tested using the broadband dielectric spectroscopy (BDS). The measurements revealed a clear dynamic crossover at the temperature \( T_{B} = 254\) K and the time scale \( \tau (T_{B}) = 5.4\) ns for the primary (structural) relaxation time and no hallmarks for the crossover for the DC electric conductivity \(\sigma_{DC}\). This result was revealed via the derivative-based and distortions-sensitive analysis \( \mathrm{d} \ln H_{a}/\mathrm{d} (1/T)\) vs. \( 1/T\) , where \( H_{a}\) stands for the apparent activation energy. Subsequent tests of the fractional Debye-Stokes-Einsten relation \( \sigma_{DC} (\tau_{\alpha})^{S} = \mbox{const}\) showed that the crossover is associated with \( S = 1\) \( (\mathrm{for}\ T > T_{B}) \rightarrow S = 0.84\) (for \( T < T_{B}\). The crossover coexists with the emergence of the secondary beta relaxation, which smoothly develops deeply into the solid amorphous phase below the glass temperature \( T_{g}\).
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Starzonek, S., Kędzierska-Sar, A., Drozd-Rzoska, A. et al. Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture. Eur. Phys. J. E 41, 108 (2018). https://doi.org/10.1140/epje/i2018-11714-8
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DOI: https://doi.org/10.1140/epje/i2018-11714-8