Elastic Properties of Polychloroprene Rubbers in Tension and Compression during Ageing

Polymers

Cristian Ovalle¹  Rami Bouaziz¹  Lucien Laiarinandrasana¹  Rouslan Borisov²  Guillaume Miquelard-Garnier³  Bruno Fayolle³  Laurianne Truffault³ 

[1] Centre des Matériaux, Mines ParisTech, PSL University, CNRS UMR 7633 BP 87, F-91003 Evry, France;EDF, Nuclear New Build Engineering & Projects, Design and Technology Branch, La Grande Halle, 19 rue Pierre Bourdeix, 69007 Lyon, France;PIMM, Arts et Metiers Institute of Technology, CNRS, Cnam, HESAM University, 151 boulevard de l’Hôpital, 75013 Paris, France;

关键词: polychloroprene;    ageing;    mechanical properties;    rubber elasticity theory;    crosslinking;   

DOI  :  10.3390/polym12102354

来源: DOAJ

【 摘 要 】

Being able to predict the lifetime of elastomers is fundamental for many industrial applications. The evolution of both tensile and compression behavior of unfilled and filled neoprene rubbers was studied over time for different ageing conditions (70 °C, 80 °C and 90 °C). While Young’s modulus increased with ageing, the bulk modulus remained almost constant, leading to a slight decrease in the Poisson’s ratio with ageing, especially for the filled rubbers. This evolution of Poisson’s ratio with ageing is often neglected in the literature where a constant value of 0.5 is almost always assumed. Moreover, the elongation at break decreased, all these phenomena having a similar activation energy (~80 kJ/mol) assuming an Arrhenius or pseudo-Arrhenius behavior. Using simple scaling arguments from rubber elasticity theory, it is possible to relate quantitatively Young’s modulus and elongation at break for all ageing conditions, while an empirical relation can correlate Young’s modulus and hardness shore A. This suggests the crosslink density evolution during ageing is the main factor that drives the mechanical properties. It is then possible to predict the lifetime of elastomers usually based on an elongation at break criterion with a simple hardness shore measurement.

【 授权许可】

Unknown