Preparation And Application Of Ploymer-Metal-Organic Frameworks Materials

Metal-organic frameworks?MOFs?are made by metal centers and organic ligands by coordination bond,with defined pore and a larger surface area.Due to the variety of organic ligands,the structures of MOFs have designability,flexible tenability and functionalization of pores.These characteristics allow the MOFs use in gas separation,gas adsorption,catalysis,drug delivery,among other applications.MOFs materials have become a research frontier and hot spots in the field of materials.In this paper,we synthesised the ZIF-8 hybrid nanocrystals using self-assembled structures of poly?p-vinylbenzoic acid?-b-polystyrene?PVBA-b-PS?as templates,and explored their catalytic performance on the influence of self-assembled structures of block polymer.The second system researched the structural of hybrid materials,which used PVBA as co-ligand,and studied the adsorption property toward methylene blue?MB?of UiO-66 and PVBA-UiO-66.The main contents are as follows:?1?Poly?p-vinylbenzoic acid?-block-polystyrene self-assembled structures as templates in the synthesis of ZIF-8Firstly,the amphiphilic block copolymer—PVBA₄₂-b-PS₃₆ and PVBA₄₂-b-PS₄₂ were prepared by RAFT polymerization,in selective solvents PVBA₄₂-b-PS₃₆ and PVBA₄₂-b-PS₄₂ self-assembled to micelles and vesicle respectively,then used as templates in the synthesis of ZIF-8 nanocrystals.The structure and morphology of PVBA-b-PS/ZIF-8were characterized by ¹HMNR,IR,XRD,N₂ adsorption-desorption and TEM.We studied the catalytic activity of PVBA-b-PS/ZIF-8 with the Knoevenagel reaction of benzaldehyde and malononitrile in the absence of micelles and vesicle.PVBA-b-PS/ZIF-8 shows a high catalytic performance owing to the effect of confined space and the high local concentration of reactants.?2?Preparation of PVBA-UiO-66 hybrids and Its adsorption of methylene blueFirstly,with terephthalic acid and PVBA as mixture ligand,a series of PVBA-UiO-66were prepared containing the different mole ratio of terephthalic acid and PVBA.The structures of the PVBA-UiO-66 hybrids were characterized by IR,XRD,TG,SEM,Zeta potential,N₂ adsorption-desorption.Due to with the long PVBA as co-ligands,some defects would exist in the crystals structure.With the increase of PVBA content,the more uncoordinated carboxyl groups exist in the PVBA-UiO-66 hybrids.PVBA-UiO-66 has special function.Especially PVBA?23%?-UiO-66 hybrids exhibited the maximum adsorption capacity for MB?960 mg/g?.