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Towards In Situ Studies of Polymer Dynamics and Entanglement under Shear through Neutron Spin Echo Spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. (Materials Physics)
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

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
Keyword [en]
Neutron Spin Echo, NSE, Entanglement, Disentanglement, Shear, Polymer Dynamics, Polymer Physics, Cone To Plate, SANS, Neutron Scattering
National Category
Condensed Matter Physics
URN: urn:nbn:se:uu:diva-262370OAI: diva2:853728
Educational program
Master Programme in Physics
Available from: 2015-09-16 Created: 2015-09-14 Last updated: 2015-09-16Bibliographically approved

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