Thermodynamic consequences of the kinetic nature of the glass transition

Kajetan Koperwas; Andrzej Grzybowski; Satya N Tripathy; Elzbieta Masiewicz; Marian Paluch

doi:10.1038/srep17782

Thermodynamic consequences of the kinetic nature of the glass transition

Sci Rep. 2015 Dec 10:5:17782. doi: 10.1038/srep17782.

Authors

Kajetan Koperwas^{1

2}, Andrzej Grzybowski^{1

2}, Satya N Tripathy^{1

2}, Elzbieta Masiewicz^{1

2}, Marian Paluch^{1

2}

Affiliations

¹ Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland.
² Silesian Center for Education and Interdisciplinary Research, 75 Pulku Piechoty 1A, 41-500 Chorzow, Poland.

Abstract

In this paper, we consider the glass transition as a kinetic process and establish one universal equation for the pressure coefficient of the glass transition temperature, dTg/dp, which is a thermodynamic characteristic of this process. Our findings challenge the common previous expectations concerning key characteristics of the transformation from the liquid to the glassy state, because it suggests that without employing an additional condition, met in the glass transition, derivation of the two independent equations for dTg/dp is not possible. Hence, the relation among the thermodynamic coefficients, which could be equivalent to the well-known Prigogine-Defay ratio for the process under consideration, cannot be obtained. Besides, by comparing the predictions of our universal equation for dTg/dp and Ehrenfest equations, we find the aforementioned supplementary restriction, which must be met to use the Prigogine-Defay ratio for the glass transition.

Publication types

Research Support, Non-U.S. Gov't