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Publication Citation: Multi-Step Relaxation in Equilibrium Self-Assembling Solutions: A General Model of Relaxation in 'Complex' Fluids

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Author(s): Evgeny B. Stukalin; Jack F. Douglas; Karl Freed;
Title: Multi-Step Relaxation in Equilibrium Self-Assembling Solutions: A General Model of Relaxation in 'Complex' Fluids
Published: September 05, 2008
Abstract: We examine the rheological and dielectric properties of a solution of equilibrium self-assembling particles that form polydisperse chains whose average length depends on temperature and concentration (free association model). Relaxation of the self-assembling clusters proceeds by motions associated either with cluster rotations, diffusive internal chain dynamics, or with inter-chain entanglement interactions. This internal relaxation in these complex fluids is decribed using the following hierarchy of models to emphasize different physical effects: unentangled rod-like clusters, unentangled flexible polymers, and entangled chains. All the models yield a multi-step relaxation for low polymer scission rates ( persistent polymers ).
Citation: Journal of Chemical Physics
Volume: 129
Pages: pp. 094901-1 - 094901-17
Keywords: complex fluids;dielectric relaxation;equilbrium polymerization;multi-step relaxation;non-Arrhenius relaxation;self-assembly;stress relaxation
Research Areas: Polymers
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