Study On Preparation Of Polyamide Spherical Porous Material And Its Composite And Application With Mofs

In recent years,the shortage of water resources has increased,and the air contains a large amount of water vapor,so water can be captured from the air.As metal-organic framework materials(MOFs)have been widely studied,their applications in adsorption have shown great advantages.However,the currently reported water-absorbing MOFs have poor hydrothermal stability and are in powder form.In practical applications molding is required,and the densification of the powder will reduce its performance.Porous polymers have high porosity,and the pore geometry,size and surface function can be adjusted by various methods.MOFs can be loaded into the porous polymer matrix to effectively solve this problem.In this paper,we first synthesized the spherical porous polymer P(NIPAMco-AM)and PAM as the base material of UiO-66 by the emulsion template method;then,the UiO-66 precursor solution was pressed into by vacuum degassing and physical impregnation.In the base material,UiO-66 is nucleated and grown in situ in the base material by the hydrothermal reaction method to load it on the base material.The synthetic conditions for the preparation of spherical porous polymers and the factors affecting the growth of UiO-66 in the matrix material and the water vapor adsorption performance have been experimentally studied.The main conclusions are as follows:(1)Through the research on the synthesis conditions of P(NIPAM-co-AM)spherical porous polymer,the optimal synthesis conditions optimized within the scope of the experiment are:the mass ratio of monomer NIPAM to AM is 1.4:0.5;continuous phase deionized water The volume ratio of cyclohexane to the dispersed phase is 7:15;the content of emulsifier F-127 is 12.5%of the total mass of solids in the continuous phase;high-speed stirring for 7 minutes;the volume ratio of emulsion to the third phase is 1:11;dispersant B The base cellulose is 0.24%of the mass of the third phase;the pore-forming agent polyethylene glycol(PEG-400)is 0.25 ml;the stirring speed of the third phase is 320 330 r/min;the polymerization temperature is 50?;spherical porous polymer After soaking in ethanol for 12 h,rinse with toluene.(2)When the UiO-66 precursor solution is immersed into the matrix material,the metal salt and the ligand are dipped together;the XRD,SEM,infrared and thermogravimetric characterization analysis of the synthesized material shows that the experiment has successfully combined UiO-66 crystals are loaded on the substrate.The water vapor adsorption capacity of the spherical porous material loaded with UiO-66 increases with the increase of the loading amount of UiO-66 in the matrix material.When the loading rate of UiO-66 on the base material P(NIPAM-co-AM)and PAM is 19.7%and 37.5%,when the relative humidity P/P0 is 0.3?0.5,the corresponding water vapor adsorption capacity is the highest,respectively It is 0.12?0.20 g/g and 0.14?0.25 g/g.The water absorption is about 50%and 60%of the water absorption of pure UiO-66 powder.The experiment prepared spherical porous material as the base material for loading UiO-66 crystal powder.After loading UiO-66 into the base material,the accumulation of UiO-66 crystal powder and the forming problem were improved.