Table of Contents
ISRN Materials Science
Volume 2011 (2011), Article ID 460751, 5 pages
http://dx.doi.org/10.5402/2011/460751
Research Article

Temperature Dependence of the Activation Volume of Secondary Relaxation in Glass Formers

Department of Physics, University of Sistan and Baluchestan, P.O. Box 98155-987 Zahedan, Iran

Received 5 April 2011; Accepted 27 May 2011

Academic Editors: R. Z. Domingues and N. G. Semaltianos

Copyright © 2011 Soheil Sharifi. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We study a nonmonotonic behavior with temperature of the activation volume ΔV𝛽 of secondary relaxation in PPGE [Poly[(phenyl glycidyl ether)-co-formaldehyde]] and PVAc [Poly(vinyl acetate)] glass formers. Our results show that the non-monotonic behaviour of secondary relaxation does not depend on the type of the secondary relaxation. Moreover, the study of secondary relaxation under pressure at isothermal paths shows two different behaviours of ΔV𝛽 in the glassy state (which describe two different types of glasses); for temperatures higher than the glass transition temperature (Tg), ΔV𝛽 increases with a decrease of the temperature while at temperatures lower than Tg, ΔV𝛽 decreases with a decrease of the temperature.