Secondary relaxation in ultrastable etoricoxib: evidence of correlation with structural relaxation

TítolSecondary relaxation in ultrastable etoricoxib: evidence of correlation with structural relaxation
Tipus de publicacióJournal Article
Any de publicació2018
AutorsRodríguez-Tinoco, C, Rams-Baron, M, Ngai, KL, Jurkiewicz, K, Rodriguez-Viejo, J, Paluch, M
JournalPhysical Chemistry Chemical Physics
Volume20
Pàgines3939 - 3945
Date Published2018
ISBN Number1463-9076
Resum

Secondary relaxations are fundamental for their impact in the properties of glasses and for their inseparable connection to the structural relaxation. Understanding their density dependence and aging behavior is key to fully address the nature of glasses. Ultrastable glasses establish a new benchmark to study the characteristics of secondary relaxations, since their enthalpy and density levels are unattainable by other routes. Here, we use dielectric spectroscopy at ambient and elevated pressures to study the characteristics of the secondary relaxation in ultrastable etoricoxib, reporting a 71% decrease in dielectric strength and one decade increase in relaxation time compared to the ordinary glass. Interestingly, we find an unprecedented connection between secondary and structural relaxations in ultrastable etoricoxib in exactly the same manner as in the ordinary glass, manifested through different properties, such as aging and devitrification. These results further support and extend the general validity of the connection between the secondary and structural relaxation.

URLhttp://dx.doi.org/10.1039/C7CP06445D
Short TitlePhys. Chem. Chem. Phys.
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