Polymer motion as detected via dielectric spectra of 1,4-cis-polyisoprene under large amplitude oscillatory shear (LAOS)》.pdfVIP

J. Non-Newtonian Fluid Mech. 160 (2009) 93–103 Contents lists available at ScienceDirect Journal of Non-Newtonian Fluid Mechanics j o u rn al h omepage: w w w. elsev /locate/jnnfm Polymer motion as detected via dielectric spectra of 1,4-cis-polyisoprene under large amplitude oscillatory shear (LAOS) Kyu Hyun a,b , Sarah Höfl a , Stefan Kahle a , Manfred Wilhelm b,∗ a Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany b Institute for Chemical Technology and Polymer Chemistry, Universität Karlsruhe (TH), Engesserstraße 18, 76128 Karlsruhe, Germany a r t i c l e i n f o a b s t r a c t Article history: In order to investigate the global polymer chain motion under large amplitude oscillatory shear (LAOS), Received 10 December 2007 the dielectric properties under LAOS are measured by a new rheo-dielectric combination. The design Received in revised form 20 October 2008 of the rheo-dielectric setup including a new fixture and modified oven is explained in detail. For 1,4- Accepted 6 March 2009 cis-polyisoprene, having type-A dipoles parallel to the backbone, the dielectric dipoles can detect the global polymer chain motion via the end-to-end vector. Thus rheological and dielectric (rheo-dielectric) Keywords: properties reflect the dynamics of the polymer chain motion under LAOS. In this study, we investigate Rheo-dielectric setup the rheo-dielectric properties under LAOS with 1,4-cis-polyisoprene as model component. As the strain Rheo-dielectric pro