Towards In Situ Studies of Polymer Dynamics and Entanglement under Shear through Neutron Spin Echo Spectroscopy
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Entangled polymeric fluids subjected to shear display a stress plateau through a range of shear rates. The formation of this plateau is often attributed to an entanglement-disentanglement transition in scientific literature. However, to our best knowledge in situ studies recovering the intermediate scattering function of polymer dynamics under shear have until now never been performed. This thesis documents the successful development of a high viscosity shear device whose interaction with polarized neutrons is small enough to allow use for Neutron Spin Echo spectroscopy. Further, first measurements towards the direct observation of the variation of the degree of entanglement throughout increasing shear are documented, albeit yet for too short Fourier times to measure beyond Rouse dynamics.
Place, publisher, year, edition, pages
Neutron Spin Echo, NSE, Entanglement, Disentanglement, Shear, Polymer Dynamics, Polymer Physics, Cone To Plate, SANS, Neutron Scattering
Condensed Matter Physics
IdentifiersURN: urn:nbn:se:uu:diva-262370OAI: oai:DiVA.org:uu-262370DiVA: diva2:853728
Master Programme in Physics
Wolff, Max, Prof.Adlmann, Franz
Korn, Andreas, Prof.