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Thermal Aging Effect on Mechanical Properties of Polyurethane

Article dans une revue avec comité de lecture
Author
FARZANEH, Sedigheh
ABDALLAH-ELHIRTSI, Sofiane
ESMAEILLOU, Bardia
NONY, Fabien
45202 CEA Le Ripault [CEA Le Ripault]
BARON, A
ccTCHARKHTCHI, Abbas
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]

URI
http://hdl.handle.net/10985/9892
DOI
10.1080/1023666X.2014.932644
Date
2014
Journal
International Journal of Polymer Analysis and Characterization

Abstract

This study concerns the effect of thermal aging on mechanical properties of polyurethane. Polyurethane samples were exposed at 85° and 120°C under inert atmosphere. Mechanical tests were carried out on these samples the aging period. Tensile tests were performed to see the effect of aging on elastic modulus (E), stress (σr), and strain (ϵr) at break. It was shown that there are two distinct periods. Due to aging, E and σr increase in the first period, then they decrease in the second period. ϵr decreases first and then increases. Fatigue tests were performed on unaged and aged samples. It was shown that the fatigue behavior of polyurethane (PU) is improved the same way during the first stage of aging. In the second step, the number of cycles to failure increases due to aging. The results show that aging has an important effect on mechanical properties of PU. The strain at break decreases during the first step of aging due to post-cross-linking and then increases due to chain scission in the network. Based on these results, the effect of cross-linking and chain scission on the mechanical properties of PU was discussed.

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