Synthesis And Application Of Nitrogen-modified Mesoporous Polymer Materials

In recent years,with the development of science and the progress of science and technology,people are increasingly concerned about environmental issues,the current human is facing a very serious resource and environmental crisis,deteriorating environment so that chemists have to consider reducing the chemical harm to the environment.The concept of green chemistry came into being,to consider how to deal with the chemical industry to produce a variety of toxic waste,more importantly,at the source to be resolved,that is,select the renewable non-polluting substrate,the design of reasonable reaction conditions and catalyst.The presence of by-products is not necessary,and the homogeneous catalyst can be immobilized,and the catalyst can be recycled in a simple manner.In recent years,people have developed a number of polymer materials with special physical and chemical properties and functions,and their performance and characteristics are far beyond the routine.In recent years,people have developed a large number of polymer materials with high physical and chemical properties and functions.The field of polymer materials.In particular,the functionalized mesoporous polymer materials have attracted much attention from a wide range of scientific scholars,and the fields of physics,chemistry,biology,medicine,environment and materials are undergoing great changes.How to realize the functionalization of polymer materials and realize the industrial production is also a huge challenge faced by scientists.On the one hand,the mesoporous polymer material has a large specific surface area,ordered pore structure so that the catalytic active components can be uniformly dispersed on the carrier surface;the other hand,the use of good chemical stability of the mesoporous polymer material will not be destroyed Active components of the chemical microenvironment,on the contrary,the carrier provides a relatively inert chemical microenvironment will catalyze the active components play a protective role.The phenolic resin has a large number of phenolic hydroxyl groups,which is favorable for the adsorption of metal ions,and the short pores of the nano-pellets with rapid adsorption balance,rich benzene ring structure leads to uneven electronic distribution,thereby increasing the amount of material adsorption.In the preparation of immobilized catalyst,the post-grafting method often reduces the catalytic activity due to the clogging of the organic groups.When the heterogeneous catalyst is prepared by in-situ copolymerization,the organic groups are copolymerized into the carrier backbone,So that the distribution of active sites can be dispersed and difficult to cause clogging of the pores.At the same time because the polymer itself has a strong toughness,can be a simple dipping method can be loaded to the metal ions to the phenolic resin up.Based on this idea,the catalytic activity of different catalysts in Knoevenagel reaction and Henry reaction,as well as the catalytic activity of catalyst after Suzuki coupling reaction and Barbier reaction,are mainly divided into the following three parts :In the first part,3-hydroxypyridine and phenol and formaldehyde were used as raw materials,and the non-ionic surfactant EO-PO polyether type F127 was used as the structure-directing agent to obtain nitrogen-modified functional nanospheres by hydrothermal synthesis(3HP-MPNs).The material has a short ordered straight channel and regular morphology,which contributes to the mass transfer and diffusion of molecular and product molecules and is carried out by co-catalyzing the basic active sites of the skeleton and the specific spatial orientation of phenol in the water medium Knoevenagel reaction.In the second part,2-hydroxy-5-nitropyridine and phenol and formaldehyde were used as raw materials,and the non-ionic surfactant EO-PO polyether type F127 was used as the structure-directing agent to obtain nitrogen modified by hydrothermal synthesis functionalized nano-pellets(2HP-5NG-MPNs).The material has a short ordered straight pore and regular morphology,which contributes to the mass transfer and diffusion characteristics of molecules and product molecules,and utilizes the amino acid formed by its high temperature calcination to catalyze the solventless Henry reaction.In the third part,the functionalized mesoporous phenolic resin with highly ordered nitrogen modification was synthesized by hydrothermal method.Then,the supported metal(Pd)nanocatalyst was synthesized by impregnation method.Based on the alkali polymer and the uniformity of the nanoparticles were applied to the Suzuki coupling reaction.The second part of the prepared material was combined with other metals and the reactivity was measured.In summary,the main objectives of the paper focus on the development of nitrogen functionalized mesoporous phenolic resin synthesis technology to optimize the preparation process and conditions(reaction temperature,concentration,composition and time of raw materials),and through the application of the material to reveal the channel morphology,The effect of bit distribution on performance.Looking at the history of the development of materials,we can easily find phenolic resin is one of the most widely used materials in our system.Therefore,functionalized mesoporous phenolic resins with controlled structures and components have a wide range of applications.