Synthesis And Characterization Of Porous Organic Carriers Containing Ionic Liquids And Supporting Of Metallocene Catalysts

As a new class of highly amorphous porous materials,porous organic polymers(POPs)have become a new research hotspot in the fields of chemistry and materials science in the past few decades.This is mainly due to interesting functions:High specific surface area,adjustable pores.In this paper,based on the loading requirements of the metallocene catalyst for the organic carrier,a porous organic carrier modified by ionic liquid is designed and synthesized,and the prepared porous organic carrier is loaded with the metallocene catalyst,and the performance of the catalyst is measured through the ethylene polymerization experiment.Evaluation,and finally the structure characterization of the polyethylene obtained after polymerization.The specific research content is as follows:First,we synthesized a binary system of porous organic polymer carrier:P(DVB-co-IL).By changing the content of DVB and IL components and under different solvent system conditions,P(DVB-co-IL)particles with different pore structures were prepared.The surface morphology of the particles was measured by scanning electron microscope,and the pore structure was characterized by the BET particle size analyzer.The results show that when ethanol with good thermodynamic compatibility is used as the solvent,the prepared sample has the high specific surface area(331.5 m~2/g),the large pore volume(0.509 cm~3/g)and the small average pore size(3.69 nm).As the amount of IL monomer added decreases,the porosity of the prepared P(DVB-co-IL)particles gradually decreases.Secondly,we synthesized a ternary system of porous organic polymer carrier:P(DVB-HEMA-IL).By changing the component content of DVB/IL/HEMA and under different solvent system conditions,P(DVB-HEMA-IL)particles with different pore structures were prepared.The surface morphology of the particles was measured by scanning electron microscope,and the pore structure was characterized by the BET particle size analyzer.The results show that when using ethanol with good thermodynamic compatibility as the solvent,the prepared sample has the large specific surface area(347.2 m~2/g),the large pore volume(0.416 cm~3/g)and the small average pore size(4.12 nm).As the amount of IL monomer added decreases,the porosity of the prepared P(DVB-HEMA-IL)particles gradually decreases.Finally,we carried out metallocene catalyst loading and ethylene polymerization experiments on the P(DVB-co-IL)and P(DVB-HEMA-IL)particles prepared in the previous chapter.The supported metallocene catalyst was tested for the metal ion content,and the polymer particles were tested for DSC,GPC,IR and surface morphology.The results show that the organic carrier modified by ionic liquid has higher activity than silica gel carrier.In addition,the larger the average pore diameter of the porous organic carrier,the lower the molecular weight of the homopolymerized polyethylene obtained after the metallocene catalyst is supported.At the same time,the larger the bulk density(mass per unit volume)of the porous organic carrier,the greater the bulk density of the prepared polymer.