Volume 64, Number 1, October 2003
|Page(s)||50 - 56|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 November 2003|
Gradient of glass transition temperature in filled elastomers
Laboratoire de Physicoschimie des Polymères et milieux dispersès
ESPCI, UMR 7615 10 rue Vauquelin, 75005 Paris, France
2 Laboratoire de Physique des Solides, UMR 8502, Université Paris-Sud, bât. 510 91405 Orsay Cedex, France
Corresponding author: email@example.com
Accepted: 18 July 2003
By studying model systems consisting of poly(ethyl acrylate) polymer chains covalently bound to silica particles, we show here how the temperature dependence of the modulus of filled elastomers can be explained by a long-ranged gradient of the polymer matrix glass transition temperature in the vicinity of the particles. We are led to this conclusion by comparing NMR and mechanical data. We show thereby that the mechanisms of reinforcement are the same as those which lead to an increase of the glass transition temperature of strongly adsorbed thin polymer films. It allows us in particular to propose a new time-temperature superposition law for the filled elastomers viscoelasticity.
PACS: 62.25.+g – Mechanical properties of nanoscale materials / 64.70.Pf – Glass transitions / 68.15.+e – Liquid thin films
© EDP Sciences, 2003
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