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Synthesis of New Ionic Liquid-Grafted Metal-Oxo Nanoclusters – Design of Nanostructured Hybrid Organic-Inorganic Polymer Networks

Abstract : Designing innovative multi-functional thermoset polymers represents a major challenge in materials science. In this work, two novel polyhedral imidazolium ionic liquid supported on oligomeric silsesquioxane nanocages having chloride (Cl-) and bistrifluoromethanesulfonimidate (NTf2-) counter anions have been synthesized. These ionic nano-objects were used to nanostructure a model epoxy network. Hence, networks displaying a homogeneous nanoscale morphology were obtained by introducing 5wt % of such organic-inorganic (O/I) silicon-oxo clusters functionalized with ionic liquids. The obtained ionic hybrid O/I epoxy-amine networks display an excellent thermal stability (> 400 °C) compared to their neat counterparts, as well as a pronounced hydrophobic character (23 mJ m-2) and good mechanical performances. Moreover, these O/I nanostructured networks demonstrate an improved fire resistance according to pyrolysis-combustion flow calorimetry (PCFC) and cone calorimetry analyses. In fact, the use of low amounts of imidazolium ionic liquid-modified polyhedral oligomeric silsesquioxanes induce a significant decrease of heat release rate (about 55 %), as well as a retardation of the ignition time (close to 29 %) compared to the neat epoxy-amine network.
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https://hal.mines-ales.fr/hal-03191501
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Soumis le : jeudi 3 juin 2021 - 13:33:13
Dernière modification le : lundi 21 novembre 2022 - 16:29:36
Archivage à long terme le : : samedi 4 septembre 2021 - 18:40:42

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Houssém Chabane, Sébastien Livi, Xavier Morelle, Rodolphe Sonnier, Loïc Dumazert, et al.. Synthesis of New Ionic Liquid-Grafted Metal-Oxo Nanoclusters – Design of Nanostructured Hybrid Organic-Inorganic Polymer Networks. Polymer, 2021, 224, pp.123721. ⟨10.1016/j.polymer.2021.123721⟩. ⟨hal-03191501v2⟩

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