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Heat Conduction in Filled Polymers Experimental and Simulative Investigations on Microscopic Heat Transport and Particle-Level Phenomena (en Inglés)
Roser, Oliver (Autor)
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Heat Conduction in Filled Polymers Experimental and Simulative Investigations on Microscopic Heat Transport and Particle-Level Phenomena (en Inglés) - Roser, Oliver
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Reseña del libro "Heat Conduction in Filled Polymers Experimental and Simulative Investigations on Microscopic Heat Transport and Particle-Level Phenomena (en Inglés)"
Thermally conductive filled polymers are widely used in micro and power electronics as well as in electromobility. They have a highly complex and heterogeneous microstructure. The present work describes the development and application of experimental and simulative methods to investigate the microscopic heat transport through filled polymers and across filled polymer to substrate transitions. The aim is to develop a comprehensive understanding of the effects of various polymer, filler, and substrate properties on the effective thermal conductivity and on thermal contact resistance between filled polymers and solid surfaces. Experimental studies are carried out using the steady-state cylinder method and a newly developed technique based on micro thermography. This enables microscopic resolution of the thermal contact resistances, providing insight into the mechanisms in filled polymer to substrate transitions that were previously unattainable. In addition, microstructure simulation models assist the investigation into the processes inside the materials that cannot be resolved experimentally. The simulative investigations also allow an isolated analysis of individual influencing variables, which is only possible to a limited extent experimentally due to the versatile property profiles of available fillers. The geometrically detailed microstructure models can be constructed based on measurable material properties such as particle shape plus size distribution or surface structure of a substrate and thus reconstruct the structure of real sample materials. Generally, the effect of the microscopic packing structure is more significant than that of the thermal properties of polymer, filler, and substrate. Particle morphology, size distribution, packing compaction and phenomena such as agglomeration and sedimentation define how well thermally conductive paths are formed in the material and which filler volume fractions are necessary to achieve the desired effect
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