RUS  ENG
Full version
JOURNALS // Fizika Tverdogo Tela // Archive

Fizika Tverdogo Tela, 2016 Volume 58, Issue 2, Pages 372–376 (Mi ftt10092)

This article is cited in 6 papers

Polymers

Temperature range of the liquid–glass transition

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: It has been shown that the currently used method for calculating the temperature range of $\delta T_{g}$ in the glass transition equation $q\tau_{g}=\delta T_{g}$ as the difference $\delta T_{g}=(T_{12}-T_{13})$ results in overestimated values, which is explained by the assumption of a constant activation energy of glass transition in deriving the calculation equation $(T_{12}$$T_{13}$ are the temperatures corresponding to the logarithmic viscosity values of $\operatorname{lg}\eta$ = 12 and $\operatorname{lg}\eta$ = 13). The methods for the evaluation of $\delta T_{g}$ using the Williams–Landel–Ferry equation and the model of delocalized atoms are considered, the results of which are in satisfactory agreement with the product $q\tau_{g}$ ($q$ is the cooling rate of the melt and $\tau_{g}$ is the structural relaxation time at the glass transition temperature). The calculation of $\tau_{g}$ for inorganic glasses and amorphous organic polymers is proposed.

Keywords: Glass Transition, Inorganic Glass, Landel, Structural Relaxation Time, Sodium Silicate Glass.

Received: 22.07.2015


 English version:
Physics of the Solid State, 2016, 58:2, 382–386

Bibliographic databases:


© Steklov Math. Inst. of RAS, 2025