On the Relaxation Nature of the Glass Transition of Amorphous
Polymers and Low-Molecular Amorphous Materials

D. S. Sanditov^{a, b,} *, M. V. Darmaev^a, and B. D. Sanditov^a

^a Buryat State University, ul. Ranzhurova 6a, Ulan-Ude, 670000 Buryatia, Russia

* e-mail: sanditov@bsu.ru

^b Institute of Physical Material Science, Siberian Branch of the Russian Academy of Sciences,
ul. Sakhyanovoi 8, Ulan-Ude, 670047 Buryatia, Russia

Received October 22, 2014

Abstract—The relative temperature range (T_g/T_g) characterizing the liquid-to-glass transition is a single-val-
ued function of the fluctuation volume fraction f_g frozen at the glass transition temperature T_g. The fluctuation
volume 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 = V_e/V controls the
molecular mobility that is characteristic of delocalized atoms in the liquid–glass transition region. It is shown
that T_g for the majority of amorphous materials is only 0.7% of the glass transition temperature T_g. The narrow
temperature range T_g is consistent with the classical Simon concept on the insignificant temperature range in
which the structure is frozen.

DOI: 10.1134/S1063783415080272

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