Logo image
Back
Testing the paradigm of an ideal glass transition: Dynamics of an ultrastable polymeric glass
Journal article   Open access   Peer reviewed

Testing the paradigm of an ideal glass transition: Dynamics of an ultrastable polymeric glass

Heedong Yoon and Gregory B. McKenna
Science advances, v 4(12), pp eaau5423-eaau5423
07 Dec 2018
DOI: https://doi.org/10.1126/sciadv.aau5423
PMID: 30588491
url
https://doi.org/10.1126/sciadv.aau5423View
Published, Version of Record (VoR)CC BY-NC V4.0,  Open

Abstract

Measurements on nanogram samples of ultrastable polymer Teflon films challenge paradigms of the glass transition event. A major challenge to understanding glass-forming materials is obtaining equilibrium data far below the laboratory glass transition temperature T g . The challenge arises because it takes geologic aging times to achieve the equilibrium glassy state when temperatures are well below T g . Here, we finesse this problem through measurements on an ultrastable amorphous Teflon with fictive temperature T f near to its Kauzmann temperature T K . In the window between T f and T g , the material has a lower molecular mobility than the equilibrium state because of its low specific volume and enthalpy. Our measurements show that the determined scaled relaxation times deviate strongly from the classical expectation of divergence of time scales at a finite temperature. The results challenge the view of an ideal glass transition at or near to T K .

Metrics

8 Record Views
50 citations in Web of Science
43 citations in Scopus

Details

InCites Highlights

Data related to this publication, from InCites Benchmarking & Analytics tool:

Collaboration types
Domestic collaboration
Web of Science research areas
Chemistry, Physical
Logo image