Volume 93, Number 5, March 2011
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||10 March 2011|
Transient forces and non-equilibrium states in sheared polymer networks
Department of Physics, Harvard University - 9 Oxford Street, Cambridge, 02138 MA, USA
2 Institut de la Matière Condensée et des Nanosciences, Université Catholique de Louvain Croix du Sud 1, 1348 Louvain-la-Neuve, Belgium, EU
3 Computational Biophysics, University of Twente - PO Box 217, 7500 AE, Enschede, The Netherlands, EU
4 Institute for Physical Sciences and Technology, University of Maryland - College Park, 20742-2431 MD, USA
Accepted: 9 February 2011
The response of many soft materials to external fields is dominated by transient forces, which arise from memory of the configurations the system has undergone in the past. Using large-scale particle-based simulations we show that these transient forces lead to a rich non-equilibrium behavior in networks of soft polymeric particles or polymer-engrafted colloids. We compute the diagram of states for an experimental system of network-forming associative polymers and show viscoelastic instabilities such as shear banding, melt fracture and a shear-induced disorder-order transition.
PACS: 83.60.Wc – Flow instabilities / 83.80.Kn – Physical gels and microgels / 81.16.Rf – Micro- and nanoscale pattern formation
© EPLA, 2011
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