Direct Measurement of Topological Interactions In Polymers under Shear Using Neutron Spin Echo Spectroscopy

Abstract

<div><div><div><div><p>We present in-situ neutron spin echo measurements on an entangled polydimethylsiloxane melt under shear and demonstrate the ability to monitor nano-scale dynamics in flowing liquids. We report no changes in the topological interactions of the chains for shear rates approaching the inverse longest relaxation time. Further experiments following along this line will allow to systematically test the predictions of theories, like e.g. convective constraint release.</p></div></div></div></div>

On the Mechanism of Shear-Thinning in Viscous Oppositely Charged Polyelectrolyte Surfactant Complexes (PESCs)

“…increase of mobility of the PE chains in the aggregates. In principle, rheoNSE measurements 41 might be able to clarify this point in the future (Figure 4).…”