In recent decades, membrane technology has shown its great performance in liquid phase separations such as production of drinking water from seawater. It has now attracted much scientific attention to expand its application to gas separations. Separation of air components, H2 from refinery industrial gases, separation and recovery of CO2 from biogas and natural gas are some examples in which the membrane technology is potentially applied at industrial level. The membrane based separation was either partially substituted or integrated with conventional methods like cryogenic distillation to product oxygen-enriched air (mole fraction ≥ 30% ) that is injected into industrial burners to obtain higher temperature with less gas consumption. It is also possible to use membrane technology to capture and recycle CO2 emitted from flue gas streams of power plants and steel mills in solving the greenhouse effect. The membranes for gas separation can be classified in two main categories, based on material, polymeric and inorganic, in which polymeric membranes are more popular. Compared to the inorganic, the polymer membranes show better processability, mechanical strength and higher packing density, hence, being suitable for large-scale applications. They cannot, however, withstand high temperatures or aggressive chemical agents. Their separation properties (permeability and selectivity) may be severely affected by condensable hydrocarbons (C2+) when they are applied in petrochemical plants, refineries and natural gas treatment. To enhance the performance of polymer membranes, a new concept, mixed matrix membrane (MMM), has been proposed by dispersing nanoor micro-sized particles of inorganic materials into a polymer matrix. In this work, we have prepared novel MMMs using polymers and metal organic framework (MOF) as the continuous and dispersed phases, respectively. We have developed several techniques to overcome the weak interfacial adhesion between the two phases that typically decreases the separation efficiency of MMMs. To do so, in the first part of this thesis (Chapter 3), we have synthesized a −NH2 included MOF particle and a series of −OH decorated polymers for MMM preparation. The physical bonding between the two functional groups was found to clearly improve the polymer/filler adhesion of the obtained MMMs as well as their gas separation performance. Then, in the following part (Chapter 4), we have in-

Contrôle de l'interaction polymère/particules dans les membranes à matrice mixte

Metal-organic frameworks (MOFs) are ap romising class of nanoporous polymeric materials .H owever ,t he proc- essing of such fragile crystalline powders into desired shapes for further applications is often difficult. Ap hotoinduced postsynthetic polymerization (PSP) strategy was now employed to covalently link MOF crystals by flexible polymer chains ,t hus endowing the MOF powders with processability and flexibility .N anosize dU iO-66-NH2 was first functionalized with polymerizable functional groups ,a nd its subsequent copolymerization with monomers was easily induced by UV light under solvent-free and mild conditions .B ecause of the improved interaction between MOF particles and polymer chains ,t he resulting stand-alone and elastic MOF-based PSP- derived membranes possess crack-free and uniform structures and outstanding separation capabilities for Cr VI ions from water. Metal-organic frameworks (MOFs) are nanoporous poly- meric materials constructed from metal ions or clusters that are covalently linked by organic ligands and thus possess the characteristics of both organic and inorganic materials. (1)

Haiwei Li

Papers

Photoinduced Postsynthetic Polymerizatio no fa Metal-Organic Framework toward aF lexible Stand-Alone Membrane**