Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture

Szymon Starzonek; Aleksandra Kędzierska-Sar; Aleksandra Drozd-Rzoska; Mikołaj Szafran; Sylwester J. Rzoska

doi:10.1140/epje/i2018-11714-8

EPJ

Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture

Szymon Starzonek¹^,3^*, Aleksandra Kędzierska-Sar¹^,2, Aleksandra Drozd-Rzoska¹^,3, Mikołaj Szafran² and Sylwester J. Rzoska¹^,3

¹ Institute of High Pressure Physics, Polish Academy of Sciences, ul. Sokołowska 29/37, 01-142, Warsaw, Poland
² Department of Chemical Technology, Warsaw University of Technology, ul. Noakowskiego 3, 00-664, Warsaw, Poland
³ Warsaw Dielectrics Group, Warsaw, Poland

Received: 15 August 2017
Accepted: 13 August 2018
Published online: 20 September 2018

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 $T_{g}$ .

Key words: Soft Matter: Polymers and Polyelectrolytes

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EPJ

Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture

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