Study of the thermal properties of polyester composites loaded with oriented carbon nanofibers using the front-face flash method |
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Institution: | 1. 3SR Lab, Univ. Grenoble Alpes, F-38000 Grenoble, France;2. 3SR Lab, CNRS, F-38000 Grenoble, France;3. MATEIS CNRS UMR5510, INSA-Lyon, Université de Lyon, F-69621 Villeurbanne, cedex, France;4. LaMCoS CNRS UMR5259, INSA-Lyon, Université de Lyon, F-69621 Villeurbanne, cedex, France |
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Abstract: | In this work, we have prepared polyester resin based composites, loaded with carbon nanofibers decorated with magnetite nanoparticles (m-CNF) in several volumetric concentrations covering from 0 to 3.25% and oriented applying a constant magnetic field before polymerization. A study of the heat transfer along the direction of the alignment of the fibers was performed by measuring the in-depth thermal diffusivity and thermal effusivity using the laser flash method in the front-face configuration. For the maximum volumetric concentration of aligned nanofibers along the thickness of the sample, an improvement of 80% of the thermal conductivity above the thermal conductivity of the polyester resin was observed. In contrast, the increment of the thermal conductivity was only of 20% above the value of the matrix for samples with non-oriented carbon nanofibers. The effects of the m-CNF and their orientation on the effective thermal conductivity of the composites were analyzed using a simple theoretical model, which takes into account the thermal mismatch between the matrix and the fillers, as well as the aspect ratio of the embedded fibers. |
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Keywords: | Carbon nanofibers Polymer-matrix composites Thermal transport properties Flash method Non-destructive testing |
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