Coupling of Caged Molecule Dynamics to JG β-Relaxation II: Polymers

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

Abstract

At temperatures below the nominal glass transition temperature Tgα, the structural α-relaxation and the Johari-Goldstein (JG) β-relaxation are too slow to contribute to susceptibility measured at frequencies higher than 1 GHz. This is particularly clear in the neighborhood of the secondary glass transition temperature Tgβ, which can be obtained directly by positronium annihilation lifetime spectroscopy (PALS) and adiabatic calorimetry, or deduced from the temperature at which the JG β-relaxation time τβ reaches 1000 s. The fast process at such high frequencies comes from the vibrations and caged molecules dynamics manifested as the nearly constant loss (NCL) in susceptibility measurements, elastic scattering intensity, I(Q, T), or the mean-square-displacement, ⟨u(2)(T)⟩, in quasielastic neutron scattering experiment. Remarkably, we find for many different glass-formers that the NCL, I, or ⟨u(2)⟩ measured in the glassy state changes its temperature dependence at temperature THF near Tgβ. In paper I (Capaccioli, S.; et al. J. Phys. Chem. B 2015, 119 (28), 8800-8808) we have made known this property in the case of the polyalcohols and a pharmaceutical glass former, flufenamic acid studied by THz dielectric spectroscopy, and explai...Continue Reading

References

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Citations

Sep 5, 2015·The Journal of Physical Chemistry. B·K L NgaiLi-Min Wang
May 8, 2016·Biochimica Et Biophysica Acta. General Subjects·K L NgaiA Paciaroni
Oct 25, 2016·Journal of Pharmaceutical Sciences·M Teresa ViciosaHermínio P Diogo
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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