The rise and fall of branching: A slowing down mechanism in relaxing wormlike micellar networks

A mean-field kinetic model suggests that the relaxation dynamics of wormlike micellar networks is a long and complex process due to the problem of reducing the number of free end-caps (or dangling ends) while also reaching an equilibrium level of branching after an earlier overgrowth. The model is validated against mesoscopic molecular dynamics simulations and is based on kinetic equations accounting for scission and synthesis processes of blobs of surfactants. A long relaxation time scale is reached with both thermal quenches and small perturbations of the system. The scaling of this relaxation time is exponential with the free energy of an end cap and with the branching free energy. We argue that the subtle end-recombination dynamics might yield effects that are difficult to detect in rheology experiments, with possible underestimates of the typical time scales of viscoelastic fluids. Published under an exclusive license by AIP Publishing.

Automated summary

A mean-field kinetic model suggests that the relaxation dynamics of wormlike micellar networks is a long and complex process, with subtle end-recombination dynamics that may not be easily detected in rheology experiments. The relaxation time scale is exponential and related to the free energy of an end cap and branching free energy.