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New optimisation and characterisation methods of tannin-based foams for thermal insulation of buildings

Abstract : In this thesis, foams based on more than 90% of natural products and with an exceptionally low thermal conductivity have been studied in depth. The main objective of this work was to improve some of the weaknesses of those materials and to solve problems that might be encountered during use, for allowing them to compete with other synthetic foams that are currently on the thermal insulation market. New methodologies have been proposed to optimise tannin-based foams from different points of view. First, liquid foams were analysed in terms of stability and polymerisation process using a backscattered light analyser, in order to convert them into improved rigid tannin-based foams. Experimental design was also used to improve the mechanical properties of physically blown rigid foams without prejudicing their thermal conductivity. On the other hand, hydrophobisation treatments were suggested for reducing the sensitivity of those foams to water in liquid or vapour form, and the effect of formulations’ ingredients on their fire properties were elucidated. Finally, two techniques of mechanical characterisation were investigated and compared, leading to Poisson’s coefficient and loss factor, and evidencing the precautions to be taken for characterising brittle foams
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Submitted on : Friday, June 22, 2018 - 4:24:25 AM
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  • HAL Id : tel-01820656, version 1

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Clara Delgado Sánchez. New optimisation and characterisation methods of tannin-based foams for thermal insulation of buildings. Material chemistry. Université de Lorraine, 2017. English. ⟨NNT : 2017LORR0246⟩. ⟨tel-01820656⟩

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