Fire behavior and morphology of epoxy-amine matrix designed by polyhedral oligomeric silsesquioxane-supported imidazolium ionic liquid (IL- g-POSSPh)
Résumé
The design of new nanostructured and high performance polymer materials is a major challenge for industrial applications (1). Here, two novel polyhedral oligomeric silsesquioxane- supported imidazolium ionic liquids having chloride (Cl-) and bis(trifluoromethane)sulfonimide (NTf2-) counter anions have been synthesized and used as nano-objects of epoxy networks prepared from copolymerization of diglycidyl ether of bisphenol A (DGEBA) and isophorone diamine (IPD). 5 wt % of hybrid organic-inorganic nanomaterials have been introduced into epoxy prepolymer leading to a homogeneous and uniform dispersion of these nano-objects into networks (10 - 100 nm) (2).The flame retardancy of these networks was studied using pyrolysis-combustion flow calorimetry (PCFC) and cone calorimetry. Finally, the use of low amount of these polyhedral oligomeric silsesquioxane-supported imidazolium ionic liquids led to a significant decrease of the peak of heat release rate (between -53 and -56 %) with a substantial and effective intumescent-like behavior compared to the neat epoxy-amine and the epoxy hybrid containing POSSPh-triol (Fig.1).