https://doi.org/10.1140/epje/i2018-11714-8
Regular Article
Unique dynamic crossover in supercooled x,3-dihydroxypropyl acrylate (x = 1, 2) isomers mixture
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
* e-mail: starzoneks@unipress.waw.pl
Received:
15
August
2017
Accepted:
13
August
2018
Published online:
20
September
2018
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 K and the time scale
ns for the primary (structural) relaxation time and no hallmarks for the crossover for the DC electric conductivity
. This result was revealed via the derivative-based and distortions-sensitive analysis
vs.
, where
stands for the apparent activation energy. Subsequent tests of the fractional Debye-Stokes-Einsten relation
showed that the crossover is associated with
(for
. The crossover coexists with the emergence of the secondary beta relaxation, which smoothly develops deeply into the solid amorphous phase below the glass temperature
.
Key words: Soft Matter: Polymers and Polyelectrolytes
© The Author(s), 2018