SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 13: Composites and Functional Polymer Hybrids
CPP 13.2: Talk
Monday, March 27, 2023, 15:30–15:45, ZEU 255
Rheological optimization of filler packings using micro scale simulations — •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
In a wide range of applications, polymers are modified with granular fillers to improve thermal or electric conductivity. The higher the amount of filler, the higher the conductivity. However, the attainable conductivity is restricted by processing limitations as the amount of filler also affects the composites viscosity. Only a clever combination of filler with multimodal size distributions can shift this limit and allow for higher amounts of filler without significant viscosity increase. The effect of multimodal packing structures on viscosity has already been investigated in several experimental and numerical studies, however common calculation techniques are mainly restricted to spherical and equal-sized filler particles. We extended common approaches with new packing simulations, considering the actual size distribution and shape of different filler materials. We implemented numerical packing optimization to find the best filler compositions for highly filled polymers with up to 80 v%. In this talk we will introduce the new packing simulations and their use for packing optimizations and present the acquired results and experimental validations.