Berlin 2024 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 17: Poster Ib
MM 17.21: Poster
Monday, March 18, 2024, 18:30–20:30, Poster F
Multi-scale modeling of heat conduction in filled polymer composites — •Oliver Roser1,2, Andreas Griesinger3, and Othmar Marti2 — 1Center for Heat Management (ZFW), Stuttgart — 2Institute of Experimental Physics, Ulm University — 3Baden-Wuerttemberg Cooperative State University (DHBW), Stuttgart
When polymers are modified with granular fillers to increase thermal conductivity, the simultaneous viscosity increase of the composite often limits the allowable filler concentration and thus the achievable thermal conductivity. If fillers from several size classes are smartly combined, the viscosity increase can be mediated and the allowable filler concentration increased. The result is a complex material whose microstructure extends over several orders of magnitude. The largest particles used may be thousands of times larger than the smallest. For a detailed simulative analysis of the heat transport phenomena in such materials, we have designed a new multi-step homogenization approach. This approach allows us to take into account the filler structure in all size scales and to calculate the achievable thermal conductivity as a function of the filler composition. Starting with the heat transfer from the smallest filler particles into the polymer up to the large spatial heat paths between the largest filler particles, all effects are taken into account. We present our multi-step homogenization approach, experimental validation, and the results of computational studies on the optimal composition of filler blends.
Keywords: Filled Polymers; Multi-Scale Heat Conduction; Multi-Step Homogenization; Filler Packing Structure