Caractérisation thermique de matériaux isolants légers. Application à des aérogels de faible poids moléculaire

Abstract : The issue of preserving energy raises a number of challenges to science, particularly its efficiency. The conception and characterization of new more efficient thermal insulating materials prove fundamental in this regard. Aerogels appear as serious candidates in this area, their manufacturing process provides extreme characteristics such as high porosity and low density for some of them. Thermal characterization of such materials is tricky, their low sensitivity to heat flux makes well-known methods difficult to implement. Through the study of low molecular weight aerogel samples designed by the LCPM a characterization method suitable to these samples has been developed by the LEMTA. This three-layers method offers the advantages of being robust and to overcome the knowledge of parameters that are difficult to reach in such cases. Describing and validating this method is the main object of this work. In addition, thermal conductivity measurements under vacuum have been processed which allowed a deeper understanding of the structure of aerogels. The results obtained this study open perspectives for the optimization of new solutions for thermal insulation
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Vincent Félix. Caractérisation thermique de matériaux isolants légers. Application à des aérogels de faible poids moléculaire. Autre. Institut National Polytechnique de Lorraine, 2011. Français. ⟨NNT : 2011INPL095N⟩. ⟨tel-01749491⟩

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