Dresden 2009 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 32: Polymer Physics III
CPP 32.2: Talk
Thursday, March 26, 2009, 09:45–10:00, ZEU 222
Modelling of hysteresis behaviour of multigraft copolymers — •Ralf Schlegel1, Daniel Wilkin1, Ulrike Staudinger1,5, Roland Weidisch1, Jimmy W. Mays2, David Uhrig3, and Nikos Hadjichristidis4 — 1Institute of Materials Science and Technology (IMT), Friedrich-Schiller-University Jena, Löbdergraben 32, D-07743 Jena, Germany — 2Department of Chemistry, University of Tennessee, Knoxville, USA — 3Center for Nanophase Materials Science at ORNL, PO BOX 2008 MS6494, Knoxville, TN USA — 4Department of Chemistry, University of Athens, Athens 15771 Greece — 5current address: Institute of Materials Science, Technische Universität Dresden, 01062 Dresden, Germany
Multigraft copolymers are thermoplastic elastomers with a special molecular architecture. Polystyrene(PS) arms are grafted regularly spaced and with different functionalities onto a rubbery polyisoprene(PI) backbone chain. Graft functionality and the number of grafting points can be controlled at synthesis level. The hysteresis properties of multigraft copolymers have been critically investigated. TEM investigations revealed that the materials are showing micro phase separation. The non-affine tube model of Kaliske and Heinrich was applied and adapted to the stress release curve of the materials. In addition to the model parameters a parameter describing the stress softening is attained. Multigraft copolymers with tetra and hexafunctional molecular architecture were characterized. Significant low stress softening characteristics were observed for the tetrafunctional materials with spherical PS micro domains.