Synthesis of new ionic liquid-grafted metal-oxo nanoclusters – Design of nanostructured hybrid organic-inorganic polymer networks. (14th May 2021)

• Record Type: Journal Article
• Authors: Chabane, Houssém; Livi, Sébastien; Morelle, Xavier P.; Sonnier, Rodolphe; LoïcDumazert, ; Duchet-Rumeau, Jannick; Gérard, Jean-François
• Is Part Of: Polymer. Volume 224(2021)
• Publication Date: 2021-05-14
• Subjects: Ionic liquid -- Polyhedral oligomeric silsesquioxane (POSS®) -- Epoxy network -- Organic-inorganic nanomaterials -- Fire resistance; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2021.123721
• Languages: English
• ISSNs: 0032-3861

Abstract

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 5 wt % 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. Graphical abstract: Image 1 Highlights: Design of New Ionic Liquid-Grafted Metal-Oxo Nanoclusters. Synergistic effect of POSS®Ph nanoclusters combined to imidazolium ionic liquids. Hybrid O/I epoxy networks with higher thermal stability and mechanical performances. Huge potential for fire retardancy of IL-grafted POSS®Ph modified epoxies.