Elaboration et caractérisation de nanofibres obtenues par l'électrofilage de mélanges polymère/nano-objet

Abstract : Ln the last decade, a novel class of coordination compounds comprising metal-based nodes and bridging organic linkers known as «Metal Organic Frameworks (MOFs) » has been extensively studied. These compounds were popularized by Yaghi et al. around 1995 and have attracted enormous attention due to their highly designable structure, their wide range of pore sizes with a large surface area and their easily tailorable functionalities. These materials offer a great potential for various applications especially in the field of catalysis, gas storage and gas separation. Despite the huge potential especially in the gas separation, there are few reports about the growth of MOFs as thin films or synthetic membranes.In this work, we describe the use of electrospinning for building hierarchical structures and auto-supported membranes of MOFs. ln fact, the electrospinning is a simple and versatile technique to produce continuous fibers with average diameters in the range of nanometers to a few micrometers.Two strategies were adopted: for producing auto-supported membranes, different polymer/MOF composites were firstly electrospun, then, the obtained nanofibers were exposed to solutions containing different cation/linker mixtures. Accordingly, after the MOFs' growth, auto-supported membranes were obtained with the nanofibers serving as backbone. ln another hand, for building hierarchical structures, polymer/cation mixtures were electrospun and the obtained nanofibers were immersed in linkers' solutions for growing different MOFs on the fibers. The described methods were successfully tested using 1\\0 polymers (PVA,P/\N) and different metal organic frameworks (MOF-5. I IKUST- 1 and ZIF-8). Indeed, these MOFs are among the most representative metal organic frameworks. Finally, the different obtained materials were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy, powder X-ray diffraction and thermogravimetric analysis.
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Hanen Talmoudi. Elaboration et caractérisation de nanofibres obtenues par l'électrofilage de mélanges polymère/nano-objet. Matériaux. Université de Haute Alsace - Mulhouse; Faculté des sciences, université de Monastir, Tunisie, 2018. Français. ⟨NNT : 2018MULH2299⟩. ⟨tel-02184793⟩

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