Polyméthacrylate de méthyle (PMMA) : Développement de nouveaux systèmes retardateurs de flamme à base de nanocharges minérales. Recherche de synergies avec des montmorillonites et des composés phosphorés

Abstract : The poly(methyl methacrylate) (PMMA) is a very interesting thermoplastic polymer. It finds many applications in many sectors and particularly in the field of lighting (lamps, signs...). However, like many polymers, it is easily flammable and its fireproofing is an important commercial stake, especially as the norms in the matter are more and more stricts (halogen-free compounds). Among the methods of improvement of the fire resistance of polymers, one of the most used consists in incorporating in the polymeric matrix particles of inorganic compounds. Among those, clays of the montmorillonite type are particularly promising by ensuring the construction of a silicato-carbonized layer at the surface of the polymer during its combustion. Nevertheless, the majority of the performed studies show the need for using these lamellar particles in combination with other flame retardant additives in order to obtain a flame behaviour fully meeting the norms in use. Among these additives, are the metallic oxide nanoparticles. The principal objective of this work was the study of the effect of some metal oxides or hydroxides, with different features (size and specific surface area), on the thermal stability and fire resistance of PMMA. Then, synergies were investigated between the oxides considered as the most interesting (particularly, the nanometric ones) and an organo-modified montmorillonite (OMMT) or with various commercial phosphorated flame retardant additives.
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Abdelghani Laachachi. Polyméthacrylate de méthyle (PMMA) : Développement de nouveaux systèmes retardateurs de flamme à base de nanocharges minérales. Recherche de synergies avec des montmorillonites et des composés phosphorés. Autre. Université Paul Verlaine - Metz, 2005. Français. ⟨NNT : 2005METZ012S⟩. ⟨tel-01752425⟩

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