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Fizika Tverdogo Tela, 2015 Volume 57, Issue 8, Pages 1629–1634 (Mi ftt11607)

Polymers

On the relaxation nature of the glass transition of amorphous polymers and low-molecular amorphous materials

D. S. Sanditovab, M. V. Darmaeva, B. D. Sanditova

a Buryat State University, Ulan-Ude
b Institute of Physical Materials Science, Siberian Branch of the Russian Academy of Sciences

Abstract: The relative temperature range $(\delta T_g/T_g)$ characterizing the liquid-to-glass transition is a single-valued function of the fluctuation volume fraction $f_g$ frozen at the glass transition temperature $T_g$. The fluctuation volume $\Delta V_e$ of the amorphous material is determined by delocalization of active (excited)) atoms, i.e., their thermal displacements from equilibrium positions. The fluctuation volume fraction $f=\Delta V_e/V$ controls the molecular mobility that is characteristic of delocalized atoms in the liquid-glass transition region. It is shown that $\delta T_g$ for the majority of amorphous materials is only 0.7% of the glass transition temperature $T_g$. The narrow temperature range $\delta T_g$ is consistent with the classical Simon concept on the insignificant temperature range in which the structure is frozen.


 English version:
Physics of the Solid State, 2015, 57:8, 1666–1672

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© Steklov Math. Inst. of RAS, 2025