[Relation entre la réponse mécanique des élastomères renforcés et la dynamique des chaînes polymères confinées]
Les élastomères utilisés dans la vie courante sont toujours renforcés avec des nanoparticules rigides (noir de carbone, ou silice). L’ajout de nanoparticules rigides dans un élastomère leur confère des propriétés mécaniques très spécifiques. Dans cet article, nous rappelons d’abord ce que l’on connait aujourd’hui des propriétés mécaniques d’un élastomère autour de sa transition vitreuse, et en particulier lorsqu’il est confiné entre deux surfaces solides proche de quelques nanomètres. Puis nous expliquerons comment ces propriétés peuvent aider à la compréhension de celles des élastomères renforcés. En effet nous montrons que dans les élastomères renforcés, les propriétés mécaniques sont dominées par la propagation de la contrainte entre nanoparticules par des ponts de polymère confinés. Nous discuterons comment la connaissance de la dynamique des polymères confinés permet de comprendre les effets de température, de pression est les non-linéarités précoces de la mécanique des élastomères renforcés.
Elastomers used in everyday life are always reinforced with rigid nanoparticles (carbon black or silica). The addition of rigid nanoparticles to an elastomer gives it very specific viscoelastic properties. In this article, we discuss the current understanding of mechanical properties of a polymer matrix around its glass transition, focusing on the situation of polymers confined between two rigid surfaces with a nanometric gap. Then, we will explain how the properties of the matrix can help to understand the properties of filled or reinforced elastomers. We will then explain that in reinforced rubbers, the mechanical properties are dominated by stress propagation between neighboring aggregates through a nanometric polymer gap, thus by confined polymer bridges. We will discuss how knowledge of the dynamics of confined polymers allows us to understand the temperature dependence, the pressure dependence and the non-linearities observed for strain below 0.1 of reinforced elastomers.
Publié le :
Mot clés : Transition vitreuse, Physique des polymères, Propriétés mécaniques, Élastomères renforcés, Confinement, Nanoparticules, Pression
CC-BY 4.0
@article{CRPHYS_2021__22_S5_33_0,
author = {Helene Montes and Francois Lequeux},
title = {Relation between mechanical response of reinforced elastomers and dynamics of confined polymer chains},
journal = {Comptes Rendus. Physique},
pages = {33--50},
publisher = {Acad\'emie des sciences, Paris},
volume = {22},
number = {S5},
year = {2021},
doi = {10.5802/crphys.96},
language = {en},
}
TY - JOUR AU - Helene Montes AU - Francois Lequeux TI - Relation between mechanical response of reinforced elastomers and dynamics of confined polymer chains JO - Comptes Rendus. Physique PY - 2021 SP - 33 EP - 50 VL - 22 IS - S5 PB - Académie des sciences, Paris DO - 10.5802/crphys.96 LA - en ID - CRPHYS_2021__22_S5_33_0 ER -
%0 Journal Article %A Helene Montes %A Francois Lequeux %T Relation between mechanical response of reinforced elastomers and dynamics of confined polymer chains %J Comptes Rendus. Physique %D 2021 %P 33-50 %V 22 %N S5 %I Académie des sciences, Paris %R 10.5802/crphys.96 %G en %F CRPHYS_2021__22_S5_33_0
Helene Montes; Francois Lequeux. Relation between mechanical response of reinforced elastomers and dynamics of confined polymer chains. Comptes Rendus. Physique, Volume 22 (2021) no. S5, pp. 33-50. doi : 10.5802/crphys.96. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.96/
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