Spectral hole burning to probe the nature of unjamming (Payne effect) in particle-filled elastomersC. G. Robertson and X. Wang
Applied Physics Research Group, Bridgestone Americas, Center for Research and Technology - 1200 Firestone Parkway, Akron, OH 44317-0001, USA
received 6 June 2006; accepted 21 August 2006
published online 8 September 2006
The Payne effect is a low-strain hysteretic softening in particle-filled elastomers which we recognize as part of jamming physics. We find that aging at a fixed oscillatory strain produces a hole in the unjamming loss modulus spectrum which is localized near the aging strain for a silica-filled elastomer. This cannot be predicted by any existing Payne effect model. By applying the Einstein fluctuation-dissipation relation and comparing our findings to nonequilibrium glassy behavior, we show that oscillatory strain amplitude in particle-filled elastomers can be interpreted as an effective temperature.
64.70.Dv - Solid-liquid transitions.
81.05.Qk - Reinforced polymers and polymer-based composites.
83.80.Hj - Suspensions, dispersions, pastes, slurries, colloids.
© EDP Sciences 2006