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
Pub Type: Journals
complex fluids, dielectric relaxation, equilbrium polymerization, multi-step relaxation, non-Arrhenius relaxation, self-assembly, stress relaxation