Thermal Aging Effect on Mechanical Properties of PolyurethaneReport as inadecuate

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1 PIMM - Procédés et Ingénierie en Mécanique et Matériaux Paris 2 CEA Le Ripault - CEA Le Ripault 3 Raigi - Raigi SA

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.

Keywords : Fatigue behavior Mechanical properties Polyurethane Thermal aging

Author: Abbas Tcharkhtchi - S Farzaneh - S Abdallah-Elhirtsi - B Esmaeillou - F Nony - A. Baron -



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