"

Cookies ussage consent

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

I agree, do not show this message again.

THE STUDY OF THE GLASS TRANSITION BY THE STEPSCAN DSC TECHNIQUE

J. Holubová1,* , Z. Cernošek1, E. Cernošková2

Affiliation

  1. Department of General and Inorganic Chemistry, University of Pardubice, nám. Legií 565 CZ-532 10 Pardubice, Czech Republic
  2. Joint Laboratory of Solid State Chemistry of Institute of Macromolecular Chemistry of Czech Acad. Sci. and University of Pardubice, Studentská 84, CZ-532 10 Pardubice, Czech Republic

Abstract

The glass transition has been studied by novel StepScan DSC technique (Perkin-Elmer). This one allows separate by way of equilibrium steps fast reversible processes from slow kinetic ones. The reversible part of the glass transition has been the subject of this study. It was found that this part could be regarded as a temperature dependence of equilibrium glass«undercooled melt conversion, a. Two-parametric semi-empirical model a=1-exp( (T/T’g)n) was proposed. Parameter T’g corresponds to the inflection point of S-shaped a vs. T curve. The steepness parameter, n, depends inversely on the glass transition temperature. The results obtained means that untransformed glass and undercooled melt coexist in the glass transition region..

Keywords

Non-crystalline materials, StepScan DSC, Glass transition.

Submitted at: June 14, 2005
Accepted at: Sept. 22, 2005

Citation

J. Holubová, Z. Cernošek, E. Cernošková, THE STUDY OF THE GLASS TRANSITION BY THE STEPSCAN DSC TECHNIQUE, Journal of Optoelectronics and Advanced Materials Vol. 7, Iss. 5, pp. 2671-2676 (2005)