Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Nanoparticles and Composite Materials I
CPP 40.6: Vortrag
Donnerstag, 25. März 2010, 11:00–11:15, H48
Dynamics of entangled Polyisoprene-POSS Nanocomposites studied by Dielectric Spectroscopy and Linear Rheology — •Thomas Glomann1,2, Klaus Nusser1,2, Gerald Johannes Schneider2, Wim Pyckhout-Hintzen1, Reiner Zorn1, Lutz Willner1, Juergen Allgaier1, and Dieter Richter1 — 1IFF, Forschungszentrum Jülich GmbH, 52425 Jülich — 2Jülich Centre for Neutron Science at FRM2, 85747 Garching
Filler particles can tremendously improve the macroscopic properties of polymeric substances attributing to the enormous technological importance of composite materials. Recently, it was found that the addition of nanosized particles can lead to new and unexpected effects like a huge drop in viscosity. The microscopic details of the complex polymer-filler interactions still lack a general understanding.
We investigated the dynamics of entangled polyisoprene in the presence of POSS (polyhedral oligomeric silsesquioxanes) nanoparticles at different filler loadings by means of dielectric spectroscopy and linear rheology. The dielectric measurements reveal that the particles do not alter the observed microscopic chain dynamics at all. However, the mechanical properties show a strong increase in modulus strength with increasing filler concentration. Moreover, the liquid-like behavior at low frequencies changes to a solid-like behavior above a certain critical filler level.