Fast contribution to the activation energy of a glass-forming liquid

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

This paper presents physical-aging data for the silicone oil tetramethyl-tetraphenyl trisiloxane. The density and the highfrequency plateau shear modulus G1 were monitored following temperature jumps starting from fully equilibrated conditions. Both quantities exhibit a fast change immediately after
a temperature jump. Adopting the material-time formalism of Narayanaswamy, we determine from the dielectric loss at 0.178 Hz the time evolution of the aging-rate activation energy. The relative magnitude of the fast change of the activation energy differs from that of the density, but is identical to that of G1. In fact, the activation energy is proportional to G1 throughout the aging process, with minor deviations at the shortest times. This shows that for the silicone oil in question the dynamics are determined by G1 in—as well as out of—equilibrium.
OriginalsprogEngelsk
TidsskriftProceedings of the National Academy of Sciences of the United States of America
Vol/bind116
Udgave nummer34
Sider (fra-til)16736-16741
Antal sider6
ISSN0027-8424
DOI
StatusUdgivet - 20 aug. 2019

Citer dette

@article{20f8240f78f545068bcebed9c213d551,
title = "Fast contribution to the activation energy of a glass-forming liquid",
abstract = "This paper presents physical-aging data for the silicone oil tetramethyl-tetraphenyl trisiloxane. The density and the highfrequency plateau shear modulus G1 were monitored following temperature jumps starting from fully equilibrated conditions. Both quantities exhibit a fast change immediately aftera temperature jump. Adopting the material-time formalism of Narayanaswamy, we determine from the dielectric loss at 0.178 Hz the time evolution of the aging-rate activation energy. The relative magnitude of the fast change of the activation energy differs from that of the density, but is identical to that of G1. In fact, the activation energy is proportional to G1 throughout the aging process, with minor deviations at the shortest times. This shows that for the silicone oil in question the dynamics are determined by G1 in—as well as out of—equilibrium.",
author = "Tina Hecksher and Olsen, {Niels Boye} and Jeppe Dyre",
year = "2019",
month = "8",
day = "20",
doi = "10.1073/pnas.1904809116",
language = "English",
volume = "116",
pages = "16736--16741",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
publisher = "The National Academy of Sciences of the United States of America",
number = "34",

}

Fast contribution to the activation energy of a glass-forming liquid. / Hecksher, Tina; Olsen, Niels Boye; Dyre, Jeppe.

I: Proceedings of the National Academy of Sciences of the United States of America, Bind 116, Nr. 34, 20.08.2019, s. 16736-16741.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Fast contribution to the activation energy of a glass-forming liquid

AU - Hecksher, Tina

AU - Olsen, Niels Boye

AU - Dyre, Jeppe

PY - 2019/8/20

Y1 - 2019/8/20

N2 - This paper presents physical-aging data for the silicone oil tetramethyl-tetraphenyl trisiloxane. The density and the highfrequency plateau shear modulus G1 were monitored following temperature jumps starting from fully equilibrated conditions. Both quantities exhibit a fast change immediately aftera temperature jump. Adopting the material-time formalism of Narayanaswamy, we determine from the dielectric loss at 0.178 Hz the time evolution of the aging-rate activation energy. The relative magnitude of the fast change of the activation energy differs from that of the density, but is identical to that of G1. In fact, the activation energy is proportional to G1 throughout the aging process, with minor deviations at the shortest times. This shows that for the silicone oil in question the dynamics are determined by G1 in—as well as out of—equilibrium.

AB - This paper presents physical-aging data for the silicone oil tetramethyl-tetraphenyl trisiloxane. The density and the highfrequency plateau shear modulus G1 were monitored following temperature jumps starting from fully equilibrated conditions. Both quantities exhibit a fast change immediately aftera temperature jump. Adopting the material-time formalism of Narayanaswamy, we determine from the dielectric loss at 0.178 Hz the time evolution of the aging-rate activation energy. The relative magnitude of the fast change of the activation energy differs from that of the density, but is identical to that of G1. In fact, the activation energy is proportional to G1 throughout the aging process, with minor deviations at the shortest times. This shows that for the silicone oil in question the dynamics are determined by G1 in—as well as out of—equilibrium.

UR - http://glass.ruc.dk/pdf/articles/2019_PNAS_116_16736.pdf

U2 - 10.1073/pnas.1904809116

DO - 10.1073/pnas.1904809116

M3 - Journal article

VL - 116

SP - 16736

EP - 16741

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 34

ER -