Effect of hygrothermal aging on the diffusion of seawater in epoxy/glass composites studied by positron lifetime spectroscopy

Radha, J. C. and Ranganathaiah, C. (2008) Effect of hygrothermal aging on the diffusion of seawater in epoxy/glass composites studied by positron lifetime spectroscopy. Polymer Composites, 29 (2). pp. 149-155. ISSN 1548-0569

Text (Full Text) Effect of Hygrothermal Aging on the Diffusion.pdf - Published Version Restricted to Registered users only Download (275kB) | Request a copy

Abstract

Abstract The effect of hygrothermal aging on the free volume controlled diffusion of seawater in the epoxy/glass (E/G) composite samples with E-glass fibers woven at 0° and 45° to the epoxy matrix has been studied using Positron lifetime technique. The equilibrium mass uptake of seawater is assessed by the gravimetric method. The positron results indicate that the free volume hole size increases with hygrothermal aging in the composite E/G (0°) suggesting swelling while the hole size shows continuous decrease in the E/G (45°) composite up to 45°C. We also found that hygrothermal aging process in the present composites is an exothermic process. Although the equilibrium uptake of seawater decreases with the increasing temperature in both the cases, the magnitude of decrease is more in 0°-oriented composite than in 45°-oriented composite. The heat of absorption calculated from the temperature dependence of equilibrium mass uptake is found to be negative in both the cases. POLYM. COMPOS., 2008. © 2007 Society of Plastics Engineers

Item Type:	Article
Subjects:	D Physical Science > Physics
Divisions:	Department of > Physics
Depositing User:	Manjula P Library Assistant
Date Deposited:	26 Aug 2019 08:00
Last Modified:	26 Aug 2019 08:00
URI:	http://eprints.uni-mysore.ac.in/id/eprint/7050

Actions (login required)

View Item