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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|
|Pages:||pp. 094901-1 - 094901-17|
|Keywords:||complex fluids,dielectric relaxation,equilbrium polymerization,multi-step relaxation,non-Arrhenius relaxation,self-assembly,stress relaxation|
|PDF version:||Click here to retrieve PDF version of paper (805KB)|