Coupling of Caged Molecule Dynamics to JG β-Relaxation III: van der Waals Glasses

The Journal of Physical Chemistry. B
K L NgaiLi-Min Wang

Abstract

In the first two papers separately on the polyalcohols and amorphous polymers of this series, we demonstrated that the fast dynamics observed in the glassy state at high frequencies above circa 1 GHz is the caged dynamics. We showed generally the intensity of the fast caged dynamics changes temperature dependence at a temperature THF nearly coincident with the secondary glass transition temperature Tgβ lower than the nominal glass transition temperature Tgα. The phenomenon is remarkable, since THF is determined from measurements of fast caged dynamics at short time scales typically in the ns to ps range, while Tgβ characterizes the secondary glass transition at which the Johari-Goldstein (JG) β-relaxation time τJG reaches a long time of ∼10(3) s, determined directly either by positronium annihilation lifetime spectroscopy, calorimetry, or low frequency dielectric and mechanical relaxation spectroscopy. The existence of the secondary glass transition originates from the dependence of τJG on density, previously proven by experiments performed at elevated pressure. The fact that THF ≈ Tgβ reflects the density dependence of the caged dynamics and coupling to the JG β-relaxation. The generality of the phenomenon and its theoretical ...Continue Reading

References

Apr 1, 1994·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·W SteffenE W Fischer
Jan 4, 2001·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·G MonacoG Ruocco
Jul 23, 2004·The Journal of Chemical Physics·K L Ngai, M Paluch
Apr 16, 2009·The Journal of Physical Chemistry. B·S CapaccioliK L Ngai
Jul 20, 2011·Carbohydrate Research·Lokendra P SinghJ Colmenero
Feb 4, 2014·Nature Communications·Y H LiuM W Chen
Jun 20, 2015·Molecular Pharmaceutics·Juraj SibikJ Axel Zeitler
Jun 20, 2015·The Journal of Physical Chemistry. B·S CapaccioliD Prevosto
Sep 1, 2015·The Journal of Physical Chemistry. B·K L NgaiLi-Min Wang

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Citations

Oct 25, 2016·Journal of Pharmaceutical Sciences·M Teresa ViciosaHermínio P Diogo
May 8, 2016·Biochimica Et Biophysica Acta. General Subjects·K L NgaiA Paciaroni
Jun 23, 2018·Physical Chemistry Chemical Physics : PCCP·Wioleta Edyta Smiszek-LindertMarian Paluch
Nov 3, 2017·Physical Chemistry Chemical Physics : PCCP·Michael T RuggieroJ Axel Zeitler
Feb 27, 2019·The Journal of Physical Chemistry. B·G P Johari
Sep 22, 2018·The Journal of Physical Chemistry Letters·Hai-Bin YuKonrad Samwer

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