(534g) Influence of Topology on Polymer Dynamics in High Shear Rate Flows

Polymers can be used as additives to manipulate the properties of fluids across a range of shear rates. These additives must be able to withstand high shear rate flows without degradation of their influence on the fluid properties. It has been found that changing the topology of the polymers can be used to improve the effectiveness of the additives. But the mechanism is not fully understood. Here we use coarse-grained simulations of polymers of varying topology in high shear rates. Changes in topology lead to changes in the structure and thereby their ability to withstand high shear rates. We are able to use the simulations to isolate the roles of finite extensibility and hydrodynamic interactions. We also compare the simulations with rheological measurements and in situ neutron scattering during high shear rates.