Table of Contents
ISRN Materials Science
Volume 2011, Article ID 764874, 10 pages
Research Article

Secondary Relaxation inside the Glass

1Department of Physics, University of Sistan and Baluchestan, P.O. Box 98155-987, Zahedan, Iran
2Iranian National Center of Laser Science and Technology, P.O. Box 1465733441, Tehran, Iran

Received 5 April 2011; Accepted 18 May 2011

Academic Editors: H. Rahier and Y. Yue

Copyright © 2011 Soheil Sharifi and Jahanbakhsh Mashaiekhy Asl. 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.


The physical properties of the glass depend on the procedure used to produce the glass. In particular, if the glass is obtained through the variation of external thermodynamic parameters, the specific way in which the parameters are varied (thermodynamic history) has influence on the final properties. In this work, we studied the effect of thermodynamic history on secondary relaxation inside the glassy state on different molecular glass forming, namely, PPGE(poly[(phenyl glycidyl ether)-co-formaldehyde]), 1,18-bis (p methoxyphenyl) cyclohexane (BMPC), poly(propylene glycol)—(PPG400), phenolphthalein-dimethyl-ether(PDE), Poly(vinyl acetate) (PVAc), and poly(bisphenol A-co-epichlorohydrin) glycidyl end-capped (DGEBA). We found secondary relaxation change with thermodynamic history and depends on the value of the activation volume which activation entropy of secondary relaxation inside the glassy state. Also, we found most of the JG secondary relaxation change with thermodynamic history and most of the Non-JG secondary relaxation are not sensitive.