Experimental clues of soft glassy rheology in strained filled elastomers

Abstract : Tensile stress-relaxation measurements have been performed on a series of cross-linked filled elastomers. The fillers are chosen in order to investigate the effect of the filler-filler and the filler-matrix interactions on the time dependence of the tensile relaxation modulus E(t) after UP and DOWN jumps. For the carbon black filled sample (strong filler-elastomer interaction) E(t) decreases as log(t) when the strain epsilon is strictly larger than 0.2 and reached by UP jumps. For the silica filled samples in the same conditions, and for all samples after a DOWN jump including epsilon = 0.2, the experimental data can be fitted with a power law equation characterized by the exponent m. Thus, in all cases, |dE(t)⁄dt| scales as t^(-α) with α=m+1. Pertinence of the Soft Glassy Rheology (SGR) model for interpreting the present results is examined. It is shown that α could be equivalent to the effective noise temperature x and related to the polymer chain mobility.
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Françoise Ehrburger-Dolle, Isabelle Morfin, Françoise Bley, Frédéric Livet, Gert Heinrich, et al.. Experimental clues of soft glassy rheology in strained filled elastomers. Journal of Polymer Science Part B: Polymer Physics, Wiley, 2014, 52, pp.647-656. ⟨10.1002/POLB.23463⟩. ⟨hal-01006630⟩

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