Synthesis And Properties Of Organic Porous Polymer Materials

Organic porous polymer materials,which are mainly composed of light elements such as C,N,O,H have the advantages of large specific surface area,good physical/chemical stability,low mass density,and synthesis diversity.These materials exhibit high pore volume and have various functions for versatile applications.The fabrication and application of them have become a popular topic in material science research.In this work,the synthesis and properties of three kinds of organic porous polymer materials have been studied:Firstly,bowls-on-sphere structured polysilsesquioxane particles(BOS-PSQs)were fabricated via a facile process from mixed silane precursors with ammonia solution as the catalyst,sodium ligninsulfonate as the surfactant,PS particles as the structure-directing agents,and water as the reaction medium.The initial investigation demonstrated that the nanoparticles with PSQs were formed first,followed by the appearance of microspheres that were synchronously surrounded by nanospheres.Reaction factors,such as the mole ratio of methytrimethoxysilane to 3-(2,3-epoxypropoxy)-propyltrimethoxysilane(MTMS/EPTMS),the sodium ligninsulfonate surfactant,the catalyst amount of ammonia solution,and the PS spheres,were proven to be essential for the formation of hierarchically structured particles.The final BOS-structured PSQs are promising in the field of molecule carriers,superhydrophobic coatings,and separation processes etc.Secondly,MOFs/polysilsesquioxane(PSQ)nanocomposites were fabricated and the property of them as drug carriers was utilized.Amine-functionalized MOF(UiO-66-NH₂)nanoparticles were synthesized and encapsulated with epoxy-functionalized polysilsesquioxane layer on the surface via a facile process.MOFs possessed high surface area and regular micropores,and PSQs offered stability,inertness,and functionality.The obtained UiO-66-NH₂@EPSQ nanocomposites were utilized as carriers for ibuprofen,a drug with carboxylic groups on the surface,and demonstrated high drug loading capacity and well-controlled release property.The UiO-66-NH₂@EPSQ nanocomposite exhibited low cytotoxicity to He La cells within a wide concentration range of 10–100?g/m L,as estimated by the MTT method.The UiO-66-NH₂@EPSQ drug release system could be a potential platform in the field of controlled drug delivery.Finally,a new type of electron-rich,nitrogen-rich and polyhydric covalent organic framework material(PAEs)containing porous and crystalline structure was fabricated by non-reversible ring-opening reaction from polyepoxide and polyamine.The materials have abundant hydroxyl(-OH)and secondary amines(-NH)on their skeleton and surface.Results of XRD and HR-TEM confirmed that the polymers contain crystalline and non-crystalline structure.The materials showed good CO₂ adsorption capacity,and the Pd nanoparticles loaded materials showed excellent catalytic performance.The materials also exhibited good thermal stability and high solvent stability.