Speaker
Dr
Maximilian Wolff
(Uppsala University)
Description
Polymers show very interesting flow properties with increasing deformation related to changes of the storage and loss moduli. Ideally, these macroscopically observable changes can be linked to the microscopic structure and dynamics. Getting a direct handle on the microscopic quantities is challenging since scattering experiments on in-situ sheared polymers are difficult. We have constructed a custom made shear device to allow in-situ scattering experiments on high molecular mass polymers at Weissenberg numbers larger than one. We developed a neutron spin echo based approach that for the first time allows to in situ monitor nano-scale dynamics in flowing media and report evidence for a transition in the topological interactions in high molecular mass polydimethylsiloxane. This transition is only traceable in the single chain dynamics but not linked to structural rearrangements.
Primary author
Dr
Maximilian Wolff
(Uppsala University)
Co-authors
David Uhrig
(Oak Ridge National Laboratory)
Mr
Franz Adlmann
(Uppsala University)
Gupta Sudipta
(Juelich Center for Neutron Research)
Mr
Maciej Kawecki
(Uppsala University)
Dr
Peter Falus
(Institut Laue-Langevin)
Dr
Philipp Gutfreund
(Institut Laue-Langevin)
