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Etude de la dégradation thermique et de la réaction au feu de nanocomposites à matrice PMMA et PS

Abstract : Despite exceptional properties, polymers are liable to ignite when reaching high temperature under air atmosphere. In order to substitute halogenated flame-retardant additives which are considered of high concern and submitted to regulations, we studied new flame-retardant systems based on nanosized mineral oxides, for two polymers: poly(methyl methacrylate) (PMMA) and polystyrene (PS). Three strategies have been developed. Firstly, we investigated the influence of nanometric silicon and aluminum oxides on flame-retardant properties and thermal stability mechanisms of thermoplastics based nanocomposites. Various parameters have been evaluated such as filler loading, chemical composition of oxide and polymer matrix. The impact of surface modification of nanoparticles on fire reaction of composites have been analysed as well. Surface treatments concerned grafting of low molecular weight organic molecules, molecular deposition of inorganic compounds and grafting of oligomers. Finally, combinations between phosphorus additives and pristine or treated nanofillers highlight strong synergies on fire reaction. The study of flame-retardancy process was carried out in particular by deep analyses of char residues.
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https://tel.archives-ouvertes.fr/tel-00382965
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Submitted on : Friday, July 24, 2009 - 2:35:10 PM
Last modification on : Wednesday, June 24, 2020 - 4:19:07 PM
Long-term archiving on: : Wednesday, September 22, 2010 - 12:48:48 PM

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  • HAL Id : tel-00382965, version 2

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Nicolas Cinausero. Etude de la dégradation thermique et de la réaction au feu de nanocomposites à matrice PMMA et PS. Sciences de l'ingénieur [physics]. Université Montpellier II - Sciences et Techniques du Languedoc, 2009. Français. ⟨tel-00382965v2⟩

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