Résumé
Fluoropolymers are exceptional materials that exhibit remarkable properties, hence being involved in High Tech applications. [1] However, fluorinated nanomaterials are scarce. The objective of this presentation consists in supplying three examples of such nanomaterials. 1) First, fluorinated terpolymers were synthesized then crosslinked according to a sol-gel process to obtain original polymer exchange fuel cell membranes (Figure 1), the conductivities of which reached 43 mS.cm-1 à 120 °C. [2] Figure 1: scanning electron microscopic picture and photograph of a membrane arising from a poly(VDF-ter-PFSVE-ter-VTES) terpolymer after sol-gel process 2) Poly(VDF-co-PMVE) copolymers (where VDF and PMVE stand for vinylidene fluoride and perfluoromethyl vinyl ether, respectively) were functionalized into novel telechelic bis(triethoxysilane)s or bis(diethoxymethylsilane)s and then crosslinked, leading to fluorinated elastomers (Figure 2) whose thermal and mechanical properties were studied. [3] These materials displayed excellent stability between -40 °C and 360 °C. Figure 2: Crosslinked telechelic bis(triethoxysilane) poly(VDF-co- PMVE) copolymer that preserved its softness (Tg = -38 °C) and thermostability (T10 = 380 °C, under air) 3) A new method of surface modification of nanosilica based of the “grafting from” polymerization of VDF enabled to offer core-shell nanoparticules coated with PVDF shell to obtain nanocomposites for coating applications. [4] References1) a) B. Ameduri and B. Boutevin; Well Architectured Fluoropolymers: Synthesis, Properties and Applications; Elsevier, Amsterdam (2004); b) B. Ameduri and H. Sawada; Fluoropolymers: Synthesis, Properties and Simulation (Volume 1) Applications (Volume 2) Royal Society of Chemistry, Cambridge (2016).2) O. Sel, A. Soules, C. Laberty, B. Ameduri and C. Sanchez, Adv. Funct. Mater. 20, 1090-1098 (2010). 3) M. H. Hung and B. Ameduri, US Patent US2011/0,136,999 (deposited by DuPont and CNRS).4) N. Durand, G. Silly, B. Boutevin and B. Ameduri, Macromolecules, 44, 6249–6257 (2010).