Table of Contents
ISRN Polymer Science
Volume 2012, Article ID 161364, 8 pages
http://dx.doi.org/10.5402/2012/161364
Research Article

Thermophysical and Mechanical Properties of Polystyrene: Influence of Free Quenching

Laboratoire de Physico-Chimie des Hauts Polymères, Université Ferhat ABBAS, Sétif 19000, Algeria

Received 9 December 2011; Accepted 31 January 2012

Academic Editors: C. De Rosa and A. Voronov

Copyright © 2012 F. Rouabah et al. 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

The effect of free quenching on the mechanical, thermal, and thermophysical properties of polystyrene has been investigated. Three different thermal treatments were investigated: a first quenching from the melt state to different temperatures, a second quenching from 𝑇 𝑔 + 7 °C, and finally an annealing. The results have shown that a slight improvement of the impact strength can be obtained after a second quenching at 40°C, and a correlation between the mechanical and thermal properties is observed. The improvement of this property was obtained at the expense of other properties such as the elastic modulus, density, hardness, and the heat distortion temperature (HDT). The little improvement of the impact strength after the second quenching is probably linked to the existence of a relaxation mode located around 40°C. However, no effects have been shown on the thermophysical properties.