Shear-induced disentanglement transition in polymer solutions and melts
Polymer solutions containing sufficiently long chains are known to show a strain plateau once a certain ammount of stress is reached. This plateau is discussed to have its origin in the formation of shear bands or in a disentanglement transition. With small angle neutron scattering it has been shown that long polymer chains under shear may stretch along the flow direction. However, rheological experiments probe dynamics properties in a sample and it is expected that transitions found in rheological measurements manifest themselves in the local dynamics of the polymer chains as well. Having shown in a proof-of-principal measurement that it is possible to monitor the dynamics of molecules and molecular segments in flowing media, we propose a full neutron spin echo experiment combined with a small angle neutron scattering study to shed light upon the origins of shear thinning in polymeric fluids.
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WOLFF Maximilian; Franz. A. Adlmann; AKIYAMA Tomoko; FALUS Peter; GUTFREUND Philipp; M. Kawecki; KOROLKOVAS Airidas and PREVOST Sylvain. (2018). Shear-induced disentanglement transition in polymer solutions and melts. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1813
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