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Giant Activity-Induced Stress Plateau in Entangled Polymer Solutions
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abstract
We study the viscoelastic properties of highly entangled, flexible, self-propelled polymers using Brownian dynamics simulations. Our results show that the active motion of the polymer increases the height of the stress plateau by orders of magnitude due to the emergence of grip forces at entanglement points. Identifying the activity-induced energy of a single polymer and the ratio of polymer length to self-propulsion velocity as relevant energy and time scales, we find the stress autocorrelation functions collapse across P\'eclet numbers. We predict that the long-time viscosity scales with polymer length squared $\sim L^2$, in contrast to equilibrium counterparts $\sim L^3$. These insights offer prospects for designing new materials with activity-responsive mechanical properties.
Forward citations
Cited by 2 Pith papers
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Activity-enhanced shear thinning of flexible linear polar polymers
Tangential polar activity amplifies shear thinning of flexible polymers, changing the viscosity exponent from 1/2 to 4/3 and the tumbling-frequency exponent from 2/3 to 1/3.
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Entropic tug of war: Topological constraints spontaneously rectify the dynamics of a polymer with heterogeneous fluctuations
A polymer with one hot block and one cold block, with no built-in direction, develops persistent drift along its own path inside a topological mesh, with speed scaling as temperature contrast divided by mesh spacing.
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