Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 40: Nanoparticles and Composite Materials I
CPP 40.10: Vortrag
Donnerstag, 25. März 2010, 12:00–12:15, H48
Modelling of electric conductivity in sheared CNT/polymer composites — •Marina Saphiannikova1, Tetyana Skipa2, Dirk Lellinger2, Ingo Alig2, and Gert Heinrich1 — 1Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Str. 6, 01069 Dresden — 2Deutsches Kunststoff Institut, Schlossgartenstr. 6, 64289 Darmstadt
Theoretical description of electric properties of the polymer melts, filled with attractively interacting conductive particles, represents a great challenge. Such filler particles tend to build a network-like structure [1] which is very fragile and can be easily broken under steady shear flow with shear rates of about 1/s. In the quiescent state of melt the particles agglomerate again, slowly restoring the network structure. The agglomeration process can be facilitated by application of shear flow with small shear rates of about 0.01/s [1]. In this study, the shear-induced changes in electric conductivity of polymer composites are described using a Bethe-lattice percolation theory [2] which enables the modelling of filler network conductivity. Additionally, we take into account the matrix conductivity enhanced by the presence of single filler particles. The percolation theory is coupled with a kinetic equation for the scalar structural parameter which describes the instantaneous state of filler network at particular flow conditions. The coupling approach is verified in transient shear experiments carried out on polycarbonate composites filled with multi-wall carbon nanotubes.
This work was supported by the BMBF grant No.03X0504E.
[1] T. Skipa et al. Phys. Stat. Sol. B 246, 2453 (2009)
[2] F. Semeriyanov et al. J. Phys. A: Math. Theor. 42, 465001 (2009)