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

ABSTRACT: 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 classic

SUBMITTER: Yoon H 

PROVIDER: S-EPMC6303122 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature